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CVE-2024-20353 (GCVE-0-2024-20353)

Vulnerability from cvelistv5 – Published: 2024-04-24 18:15 – Updated: 2025-10-21 23:05
VLAI CISA Previdian
Summary
A vulnerability in the management and VPN web servers for Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition. This vulnerability is due to incomplete error checking when parsing an HTTP header. An attacker could exploit this vulnerability by sending a crafted HTTP request to a targeted web server on a device. A successful exploit could allow the attacker to cause a DoS condition when the device reloads.
SSVC
Exploitation: active Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-04-29 20:02 UTC
CWE
  • CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')
Impacted products
Vendor Product Version CPE status
Cisco Cisco Adaptive Security Appliance (ASA) Software Affected: 9.8.1
Affected: 9.8.1.5
Affected: 9.8.1.7
Affected: 9.8.2
Affected: 9.8.2.8
Affected: 9.8.2.14
Affected: 9.8.2.15
Affected: 9.8.2.17
Affected: 9.8.2.20
Affected: 9.8.2.24
Affected: 9.8.2.26
Affected: 9.8.2.28
Affected: 9.8.2.33
Affected: 9.8.2.35
Affected: 9.8.2.38
Affected: 9.8.3.8
Affected: 9.8.3.11
Affected: 9.8.3.14
Affected: 9.8.3.16
Affected: 9.8.3.18
Affected: 9.8.3.21
Affected: 9.8.3
Affected: 9.8.3.26
Affected: 9.8.3.29
Affected: 9.8.4
Affected: 9.8.4.3
Affected: 9.8.4.7
Affected: 9.8.4.8
Affected: 9.8.4.10
Affected: 9.8.4.12
Affected: 9.8.4.15
Affected: 9.8.4.17
Affected: 9.8.4.25
Affected: 9.8.4.20
Affected: 9.8.4.22
Affected: 9.8.4.26
Affected: 9.8.4.29
Affected: 9.8.4.32
Affected: 9.8.4.33
Affected: 9.8.4.34
Affected: 9.8.4.35
Affected: 9.8.4.39
Affected: 9.8.4.40
Affected: 9.8.4.41
Affected: 9.8.4.43
Affected: 9.8.4.44
Affected: 9.8.4.45
Affected: 9.8.4.46
Affected: 9.8.4.48
Affected: 9.12.1
Affected: 9.12.1.2
Affected: 9.12.1.3
Affected: 9.12.2
Affected: 9.12.2.4
Affected: 9.12.2.5
Affected: 9.12.2.9
Affected: 9.12.3
Affected: 9.12.3.2
Affected: 9.12.3.7
Affected: 9.12.4
Affected: 9.12.3.12
Affected: 9.12.3.9
Affected: 9.12.2.1
Affected: 9.12.4.2
Affected: 9.12.4.4
Affected: 9.12.4.7
Affected: 9.12.4.10
Affected: 9.12.4.13
Affected: 9.12.4.8
Affected: 9.12.4.18
Affected: 9.12.4.24
Affected: 9.12.4.26
Affected: 9.12.4.29
Affected: 9.12.4.30
Affected: 9.12.4.35
Affected: 9.12.4.37
Affected: 9.12.4.38
Affected: 9.12.4.39
Affected: 9.12.4.40
Affected: 9.12.4.41
Affected: 9.12.4.47
Affected: 9.12.4.48
Affected: 9.12.4.50
Affected: 9.12.4.52
Affected: 9.12.4.54
Affected: 9.12.4.55
Affected: 9.12.4.56
Affected: 9.12.4.58
Affected: 9.12.4.62
Affected: 9.12.4.65
Affected: 9.14.1
Affected: 9.14.1.10
Affected: 9.14.1.6
Affected: 9.14.1.15
Affected: 9.14.1.19
Affected: 9.14.1.30
Affected: 9.14.2
Affected: 9.14.2.4
Affected: 9.14.2.8
Affected: 9.14.2.13
Affected: 9.14.2.15
Affected: 9.14.3
Affected: 9.14.3.1
Affected: 9.14.3.9
Affected: 9.14.3.11
Affected: 9.14.3.13
Affected: 9.14.3.18
Affected: 9.14.3.15
Affected: 9.14.4
Affected: 9.14.4.6
Affected: 9.14.4.7
Affected: 9.14.4.12
Affected: 9.14.4.13
Affected: 9.14.4.14
Affected: 9.14.4.15
Affected: 9.14.4.17
Affected: 9.14.4.22
Affected: 9.14.4.23
Affected: 9.15.1
Affected: 9.15.1.7
Affected: 9.15.1.10
Affected: 9.15.1.15
Affected: 9.15.1.16
Affected: 9.15.1.17
Affected: 9.15.1.1
Affected: 9.15.1.21
Affected: 9.16.1
Affected: 9.16.1.28
Affected: 9.16.2
Affected: 9.16.2.3
Affected: 9.16.2.7
Affected: 9.16.2.11
Affected: 9.16.2.13
Affected: 9.16.2.14
Affected: 9.16.3
Affected: 9.16.3.3
Affected: 9.16.3.14
Affected: 9.16.3.15
Affected: 9.16.3.19
Affected: 9.16.3.23
Affected: 9.16.4
Affected: 9.16.4.9
Affected: 9.16.4.14
Affected: 9.16.4.18
Affected: 9.16.4.19
Affected: 9.16.4.27
Affected: 9.16.4.38
Affected: 9.16.4.39
Affected: 9.16.4.42
Affected: 9.16.4.48
Affected: 9.16.4.55
Affected: 9.17.1
Affected: 9.17.1.7
Affected: 9.17.1.9
Affected: 9.17.1.10
Affected: 9.17.1.11
Affected: 9.17.1.13
Affected: 9.17.1.15
Affected: 9.17.1.20
Affected: 9.17.1.30
Affected: 9.17.1.33
Affected: 9.18.1
Affected: 9.18.1.3
Affected: 9.18.2
Affected: 9.18.2.5
Affected: 9.18.2.7
Affected: 9.18.2.8
Affected: 9.18.3
Affected: 9.18.3.39
Affected: 9.18.3.46
Affected: 9.18.3.53
Affected: 9.18.3.55
Affected: 9.18.3.56
Affected: 9.18.4
Affected: 9.18.4.5
Affected: 9.18.4.8
Affected: 9.19.1
Affected: 9.19.1.5
Affected: 9.19.1.9
Affected: 9.19.1.12
Affected: 9.19.1.18
Affected: 9.19.1.22
Affected: 9.19.1.24
Affected: 9.19.1.27
Affected: 9.20.1
Affected: 9.20.1.5
Affected: 9.20.2
guessed Create a notification for this product.
Cisco Cisco Firepower Threat Defense Software Affected: 6.2.3
Affected: 6.2.3.1
Affected: 6.2.3.2
Affected: 6.2.3.3
Affected: 6.2.3.4
Affected: 6.2.3.5
Affected: 6.2.3.6
Affected: 6.2.3.7
Affected: 6.2.3.8
Affected: 6.2.3.10
Affected: 6.2.3.11
Affected: 6.2.3.9
Affected: 6.2.3.12
Affected: 6.2.3.13
Affected: 6.2.3.14
Affected: 6.2.3.15
Affected: 6.2.3.16
Affected: 6.2.3.17
Affected: 6.2.3.18
Affected: 6.6.0
Affected: 6.6.0.1
Affected: 6.6.1
Affected: 6.6.3
Affected: 6.6.4
Affected: 6.6.5
Affected: 6.6.5.1
Affected: 6.6.5.2
Affected: 6.6.7
Affected: 6.6.7.1
Affected: 6.4.0
Affected: 6.4.0.1
Affected: 6.4.0.3
Affected: 6.4.0.2
Affected: 6.4.0.4
Affected: 6.4.0.5
Affected: 6.4.0.6
Affected: 6.4.0.7
Affected: 6.4.0.8
Affected: 6.4.0.9
Affected: 6.4.0.10
Affected: 6.4.0.11
Affected: 6.4.0.12
Affected: 6.4.0.13
Affected: 6.4.0.14
Affected: 6.4.0.15
Affected: 6.4.0.16
Affected: 6.4.0.17
Affected: 6.7.0
Affected: 6.7.0.1
Affected: 6.7.0.2
Affected: 6.7.0.3
Affected: 7.0.0
Affected: 7.0.0.1
Affected: 7.0.1
Affected: 7.0.1.1
Affected: 7.0.2
Affected: 7.0.2.1
Affected: 7.0.3
Affected: 7.0.4
Affected: 7.0.5
Affected: 7.0.6
Affected: 7.0.6.1
Affected: 7.1.0
Affected: 7.1.0.1
Affected: 7.1.0.2
Affected: 7.1.0.3
Affected: 7.2.0
Affected: 7.2.0.1
Affected: 7.2.1
Affected: 7.2.2
Affected: 7.2.3
Affected: 7.2.4
Affected: 7.2.4.1
Affected: 7.2.5
Affected: 7.2.5.1
Affected: 7.3.0
Affected: 7.3.1
Affected: 7.3.1.1
Affected: 7.4.0
Affected: 7.4.1
guessed Create a notification for this product.
cisco asa Affected: 9.8.1 , ≤ 9.8.4.48 (custom)
    cpe:2.3:a:cisco:asa:9.8.1:*:*:*:*:*:*:*
Create a notification for this product.
cisco asa Affected: 9.12.1 , ≤ 9.12.4.65 (custom)
    cpe:2.3:a:cisco:asa:9.12.1:*:*:*:*:*:*:*
Create a notification for this product.
cisco asa Affected: 9.14.1 , < 9.14.4.23 (custom)
    cpe:2.3:a:cisco:asa:9.14.1:*:*:*:*:*:*:*
Create a notification for this product.
cisco asa Affected: 9.15.1 , ≤ 9.15.1.21 (custom)
    cpe:2.3:a:cisco:asa:9.15.1:*:*:*:*:*:*:*
Create a notification for this product.
cisco asa Affected: 9.16.1 , ≤ 9.16.4.55 (custom)
    cpe:2.3:a:cisco:asa:9.16.1:*:*:*:*:*:*:*
Create a notification for this product.
cisco asa Affected: 9.17.1 , ≤ 9.17.1.33 (custom)
    cpe:2.3:a:cisco:asa:9.17.1:*:*:*:*:*:*:*
Create a notification for this product.
cisco asa Affected: 9.18.1 , ≤ 9.18.4.8 (custom)
    cpe:2.3:a:cisco:asa:9.18.1:*:*:*:*:*:*:*
Create a notification for this product.
cisco asa Affected: 9.19.1 , ≤ 9.19.1.27 (custom)
    cpe:2.3:a:cisco:asa:9.19.1:*:*:*:*:*:*:*
Create a notification for this product.
cisco asa Affected: 9.20.1 , ≤ 9.20.2 (custom)
    cpe:2.3:a:cisco:asa:9.20.1:*:*:*:*:*:*:*
Create a notification for this product.
cisco firepower_threat_defense_software Affected: 6.2.3 , ≤ 6.2.3.18 (custom)
    cpe:2.3:a:cisco:firepower_threat_defense_software:6.2.3:*:*:*:*:*:*:*
Create a notification for this product.
cisco firepower_threat_defense_software Affected: 6.6.0 , ≤ 6.6.7.1 (custom)
    cpe:2.3:a:cisco:firepower_threat_defense_software:6.6.0:*:*:*:*:*:*:*
Create a notification for this product.
cisco firepower_threat_defense_software Affected: 6.4.0 , ≤ 6.4.0.17 (custom)
    cpe:2.3:a:cisco:firepower_threat_defense_software:6.4.0:*:*:*:*:*:*:*
Create a notification for this product.
cisco firepower_threat_defense_software Affected: 6.7.0 , ≤ 6.7.0.3 (custom)
    cpe:2.3:a:cisco:firepower_threat_defense_software:6.7.0:*:*:*:*:*:*:*
Create a notification for this product.
cisco firepower_threat_defense_software Affected: 7.0.0 , ≤ 7.0.6 (custom)
    cpe:2.3:a:cisco:firepower_threat_defense_software:7.0.0:*:*:*:*:*:*:*
Create a notification for this product.
cisco firepower_threat_defense_software Affected: 7.1.0 , ≤ 7.1.0.3 (custom)
    cpe:2.3:a:cisco:firepower_threat_defense_software:7.1.0:*:*:*:*:*:*:*
Create a notification for this product.
cisco firepower_threat_defense_software Affected: 7.2.0 , ≤ 7.2.4.1 (custom)
    cpe:2.3:a:cisco:firepower_threat_defense_software:7.2.0:*:*:*:*:*:*:*
Create a notification for this product.
cisco firepower_threat_defense_software Affected: 7.3.0 , ≤ 7.3.1.1 (custom)
    cpe:2.3:a:cisco:firepower_threat_defense_software:7.3.0:*:*:*:*:*:*:*
Create a notification for this product.
cisco firepower_threat_defense_software Affected: 7.4.0 , ≤ 7.4.1 (custom)
    cpe:2.3:a:cisco:firepower_threat_defense_software:7.4.0:*:*:*:*:*:*:*
Create a notification for this product.
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant

Vulnerability ID: CVE-2024-20353

Status: Confirmed

Status Updated: 2024-04-24 00:00 UTC

Exploited: Yes


Timestamps
First Seen: 2024-04-24
Asserted: 2024-04-24

Scope
Notes: KEV entry: Cisco ASA and FTD Denial of Service Vulnerability | Affected: Cisco / Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) | Description: Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) contain an infinite loop vulnerability that can lead to remote denial of service condition. | Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. | Due date: 2024-05-01 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-websrvs-dos-X8gNucD2; https://nvd.nist.gov/vuln/detail/CVE-2024-20353

Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev


Details
Cwes CWE-835
Feed CISA Known Exploited Vulnerabilities Catalog
Product Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD)
Due Date 2024-05-01
Date Added 2024-04-24
Vendorproject Cisco
Vulnerabilityname Cisco ASA and FTD Denial of Service Vulnerability
Knownransomwarecampaignuse Unknown

References

Created: 2026-02-02 13:24 UTC | Updated: 2026-02-06 07:53 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant

Vulnerability ID: CVE-2024-20353

Status: Confirmed

Status Updated: 2024-04-24 00:00 UTC

Exploited: Yes


Timestamps
First Seen: 2024-04-24
Asserted: 2024-04-24

Scope
Notes: KEVIntel entry: A vulnerability in the management and VPN web servers for Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD)... | Affected: Cisco / Cisco Adaptive Security Appliance (ASA) Software, Cisco Firepower Threat Defense Software | CVSS: 8.6 (HIGH) | Used in malware: unknown | Not yet in CISA KEV: False

Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel


Details
Feed KEVIntel (kevintel.com)
Title A vulnerability in the management and VPN web servers for Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD)...
Vendor Cisco
Product Cisco Adaptive Security Appliance (ASA) Software, Cisco Firepower Threat Defense Software
Added Date 2024-04-24T00:00:00.000Z
Cvss Score 8.6
Epss Score None
Cvss Severity HIGH
Epss Percentile None
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev False

References

Created: 2026-06-23 11:14 UTC | Updated: 2026-06-23 11:14 UTC
Show details on NVD website

{
  "containers": {
    "adp": [
      {
        "affected": [
          {
            "cpes": [
              "cpe:2.3:a:cisco:asa:9.8.1:*:*:*:*:*:*:*"
            ],
            "defaultStatus": "unknown",
            "product": "asa",
            "vendor": "cisco",
            "versions": [
              {
                "lessThanOrEqual": "9.8.4.48",
                "status": "affected",
                "version": "9.8.1",
                "versionType": "custom"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:a:cisco:asa:9.12.1:*:*:*:*:*:*:*"
            ],
            "defaultStatus": "unknown",
            "product": "asa",
            "vendor": "cisco",
            "versions": [
              {
                "lessThanOrEqual": "9.12.4.65",
                "status": "affected",
                "version": "9.12.1",
                "versionType": "custom"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:a:cisco:asa:9.14.1:*:*:*:*:*:*:*"
            ],
            "defaultStatus": "unknown",
            "product": "asa",
            "vendor": "cisco",
            "versions": [
              {
                "lessThan": "9.14.4.23",
                "status": "affected",
                "version": "9.14.1",
                "versionType": "custom"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:a:cisco:asa:9.15.1:*:*:*:*:*:*:*"
            ],
            "defaultStatus": "unknown",
            "product": "asa",
            "vendor": "cisco",
            "versions": [
              {
                "lessThanOrEqual": "9.15.1.21",
                "status": "affected",
                "version": "9.15.1",
                "versionType": "custom"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:a:cisco:asa:9.16.1:*:*:*:*:*:*:*"
            ],
            "defaultStatus": "unknown",
            "product": "asa",
            "vendor": "cisco",
            "versions": [
              {
                "lessThanOrEqual": "9.16.4.55",
                "status": "affected",
                "version": "9.16.1",
                "versionType": "custom"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:a:cisco:asa:9.17.1:*:*:*:*:*:*:*"
            ],
            "defaultStatus": "unknown",
            "product": "asa",
            "vendor": "cisco",
            "versions": [
              {
                "lessThanOrEqual": "9.17.1.33",
                "status": "affected",
                "version": "9.17.1",
                "versionType": "custom"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:a:cisco:asa:9.18.1:*:*:*:*:*:*:*"
            ],
            "defaultStatus": "unknown",
            "product": "asa",
            "vendor": "cisco",
            "versions": [
              {
                "lessThanOrEqual": "9.18.4.8",
                "status": "affected",
                "version": "9.18.1",
                "versionType": "custom"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:a:cisco:asa:9.19.1:*:*:*:*:*:*:*"
            ],
            "defaultStatus": "unknown",
            "product": "asa",
            "vendor": "cisco",
            "versions": [
              {
                "lessThanOrEqual": "9.19.1.27",
                "status": "affected",
                "version": "9.19.1",
                "versionType": "custom"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:a:cisco:asa:9.20.1:*:*:*:*:*:*:*"
            ],
            "defaultStatus": "unknown",
            "product": "asa",
            "vendor": "cisco",
            "versions": [
              {
                "lessThanOrEqual": "9.20.2",
                "status": "affected",
                "version": "9.20.1",
                "versionType": "custom"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:a:cisco:firepower_threat_defense_software:6.2.3:*:*:*:*:*:*:*"
            ],
            "defaultStatus": "unknown",
            "product": "firepower_threat_defense_software",
            "vendor": "cisco",
            "versions": [
              {
                "lessThanOrEqual": "6.2.3.18",
                "status": "affected",
                "version": "6.2.3",
                "versionType": "custom"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:a:cisco:firepower_threat_defense_software:6.6.0:*:*:*:*:*:*:*"
            ],
            "defaultStatus": "unknown",
            "product": "firepower_threat_defense_software",
            "vendor": "cisco",
            "versions": [
              {
                "lessThanOrEqual": "6.6.7.1",
                "status": "affected",
                "version": "6.6.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:a:cisco:firepower_threat_defense_software:6.4.0:*:*:*:*:*:*:*"
            ],
            "defaultStatus": "unknown",
            "product": "firepower_threat_defense_software",
            "vendor": "cisco",
            "versions": [
              {
                "lessThanOrEqual": "6.4.0.17",
                "status": "affected",
                "version": "6.4.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:a:cisco:firepower_threat_defense_software:6.7.0:*:*:*:*:*:*:*"
            ],
            "defaultStatus": "unknown",
            "product": "firepower_threat_defense_software",
            "vendor": "cisco",
            "versions": [
              {
                "lessThanOrEqual": "6.7.0.3",
                "status": "affected",
                "version": "6.7.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:a:cisco:firepower_threat_defense_software:7.0.0:*:*:*:*:*:*:*"
            ],
            "defaultStatus": "unknown",
            "product": "firepower_threat_defense_software",
            "vendor": "cisco",
            "versions": [
              {
                "lessThanOrEqual": "7.0.6",
                "status": "affected",
                "version": "7.0.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:a:cisco:firepower_threat_defense_software:7.1.0:*:*:*:*:*:*:*"
            ],
            "defaultStatus": "unknown",
            "product": "firepower_threat_defense_software",
            "vendor": "cisco",
            "versions": [
              {
                "lessThanOrEqual": "7.1.0.3",
                "status": "affected",
                "version": "7.1.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:a:cisco:firepower_threat_defense_software:7.2.0:*:*:*:*:*:*:*"
            ],
            "defaultStatus": "unknown",
            "product": "firepower_threat_defense_software",
            "vendor": "cisco",
            "versions": [
              {
                "lessThanOrEqual": "7.2.4.1",
                "status": "affected",
                "version": "7.2.0",
                "versionType": "custom"
              }
            ]
          },
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              "status": "affected",
              "version": "7.0.6.1"
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              "version": "7.1.0"
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              "version": "7.1.0.1"
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            {
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              "version": "7.1.0.2"
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              "status": "affected",
              "version": "7.1.0.3"
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              "status": "affected",
              "version": "7.2.0"
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              "status": "affected",
              "version": "7.2.1"
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            {
              "status": "affected",
              "version": "7.2.2"
            },
            {
              "status": "affected",
              "version": "7.2.3"
            },
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              "version": "7.2.4"
            },
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              "status": "affected",
              "version": "7.2.4.1"
            },
            {
              "status": "affected",
              "version": "7.2.5"
            },
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              "status": "affected",
              "version": "7.2.5.1"
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              "version": "7.3.0"
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          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A vulnerability in the management and VPN web servers for Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition.\r\n\r This vulnerability is due to incomplete error checking when parsing an HTTP header. An attacker could exploit this vulnerability by sending a crafted HTTP request to a targeted web server on a device. A successful exploit could allow the attacker to cause a DoS condition when the device reloads."
        }
      ],
      "exploits": [
        {
          "lang": "en",
          "value": "Cisco has confirmed that this vulnerability has been exploited. Cisco strongly recommends that customers upgrade to fixed software to resolve this vulnerability. Customers are also strongly encouraged to monitor system logs for indicators of undocumented configuration changes, unscheduled reboots, and any anomalous credential activity."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.6,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
            "version": "3.1"
          },
          "format": "cvssV3_1"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-835",
              "description": "Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)",
              "lang": "en",
              "type": "cwe"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-04-24T18:15:57.646Z",
        "orgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
        "shortName": "cisco"
      },
      "references": [
        {
          "name": "cisco-sa-asaftd-websrvs-dos-X8gNucD2",
          "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-websrvs-dos-X8gNucD2"
        }
      ],
      "source": {
        "advisory": "cisco-sa-asaftd-websrvs-dos-X8gNucD2",
        "defects": [
          "CSCwj10955"
        ],
        "discovery": "EXTERNAL"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
    "assignerShortName": "cisco",
    "cveId": "CVE-2024-20353",
    "datePublished": "2024-04-24T18:15:57.646Z",
    "dateReserved": "2023-11-08T15:08:07.647Z",
    "dateUpdated": "2025-10-21T23:05:20.706Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "cisa_known_exploited": {
      "cveID": "CVE-2024-20353",
      "cwes": [
        "CWE-835"
      ],
      "dateAdded": "2024-04-24",
      "dueDate": "2024-05-01",
      "forensicTriage": "No",
      "knownRansomwareCampaignUse": "Unknown",
      "notes": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-websrvs-dos-X8gNucD2;   https://nvd.nist.gov/vuln/detail/CVE-2024-20353",
      "product": "Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD)",
      "requiredAction": "Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.",
      "shortDescription": "Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) contain an infinite loop vulnerability that can lead to remote denial of service condition.",
      "vendorProject": "Cisco",
      "vulnerabilityName": "Cisco ASA and FTD Denial of Service Vulnerability"
    },
    "epss": {
      "cve": "CVE-2024-20353",
      "date": "2026-09-20",
      "epss": "0.70686",
      "percentile": "0.99365"
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            "value": "Una vulnerabilidad en los servidores web de administraci\u00f3n y VPN para el software Cisco Adaptive Security Appliance (ASA) y el software Cisco Firepower Threat Defense (FTD) podr\u00eda permitir que un atacante remoto no autenticado provoque que el dispositivo se recargue inesperadamente, lo que resultar\u00eda en una condici\u00f3n de denegaci\u00f3n de servicio (DoS). Esta vulnerabilidad se debe a una comprobaci\u00f3n de errores incompleta al analizar un encabezado HTTP. Un atacante podr\u00eda aprovechar esta vulnerabilidad enviando una solicitud HTTP dise\u00f1ada a un servidor web espec\u00edfico en un dispositivo. Un exploit exitoso podr\u00eda permitir al atacante provocar una condici\u00f3n DoS cuando el dispositivo se recarga."
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                  "status": "affected",
                  "version": "9.12.4.38"
                },
                {
                  "status": "affected",
                  "version": "9.12.4.39"
                },
                {
                  "status": "affected",
                  "version": "9.12.4.40"
                },
                {
                  "status": "affected",
                  "version": "9.12.4.41"
                },
                {
                  "status": "affected",
                  "version": "9.12.4.47"
                },
                {
                  "status": "affected",
                  "version": "9.12.4.48"
                },
                {
                  "status": "affected",
                  "version": "9.12.4.50"
                },
                {
                  "status": "affected",
                  "version": "9.12.4.52"
                },
                {
                  "status": "affected",
                  "version": "9.12.4.54"
                },
                {
                  "status": "affected",
                  "version": "9.12.4.55"
                },
                {
                  "status": "affected",
                  "version": "9.12.4.56"
                },
                {
                  "status": "affected",
                  "version": "9.12.4.58"
                },
                {
                  "status": "affected",
                  "version": "9.12.4.62"
                },
                {
                  "status": "affected",
                  "version": "9.12.4.65"
                },
                {
                  "status": "affected",
                  "version": "9.14.1"
                },
                {
                  "status": "affected",
                  "version": "9.14.1.10"
                },
                {
                  "status": "affected",
                  "version": "9.14.1.6"
                },
                {
                  "status": "affected",
                  "version": "9.14.1.15"
                },
                {
                  "status": "affected",
                  "version": "9.14.1.19"
                },
                {
                  "status": "affected",
                  "version": "9.14.1.30"
                },
                {
                  "status": "affected",
                  "version": "9.14.2"
                },
                {
                  "status": "affected",
                  "version": "9.14.2.4"
                },
                {
                  "status": "affected",
                  "version": "9.14.2.8"
                },
                {
                  "status": "affected",
                  "version": "9.14.2.13"
                },
                {
                  "status": "affected",
                  "version": "9.14.2.15"
                },
                {
                  "status": "affected",
                  "version": "9.14.3"
                },
                {
                  "status": "affected",
                  "version": "9.14.3.1"
                },
                {
                  "status": "affected",
                  "version": "9.14.3.9"
                },
                {
                  "status": "affected",
                  "version": "9.14.3.11"
                },
                {
                  "status": "affected",
                  "version": "9.14.3.13"
                },
                {
                  "status": "affected",
                  "version": "9.14.3.18"
                },
                {
                  "status": "affected",
                  "version": "9.14.3.15"
                },
                {
                  "status": "affected",
                  "version": "9.14.4"
                },
                {
                  "status": "affected",
                  "version": "9.14.4.6"
                },
                {
                  "status": "affected",
                  "version": "9.14.4.7"
                },
                {
                  "status": "affected",
                  "version": "9.14.4.12"
                },
                {
                  "status": "affected",
                  "version": "9.14.4.13"
                },
                {
                  "status": "affected",
                  "version": "9.14.4.14"
                },
                {
                  "status": "affected",
                  "version": "9.14.4.15"
                },
                {
                  "status": "affected",
                  "version": "9.14.4.17"
                },
                {
                  "status": "affected",
                  "version": "9.14.4.22"
                },
                {
                  "status": "affected",
                  "version": "9.14.4.23"
                },
                {
                  "status": "affected",
                  "version": "9.15.1"
                },
                {
                  "status": "affected",
                  "version": "9.15.1.7"
                },
                {
                  "status": "affected",
                  "version": "9.15.1.10"
                },
                {
                  "status": "affected",
                  "version": "9.15.1.15"
                },
                {
                  "status": "affected",
                  "version": "9.15.1.16"
                },
                {
                  "status": "affected",
                  "version": "9.15.1.17"
                },
                {
                  "status": "affected",
                  "version": "9.15.1.1"
                },
                {
                  "status": "affected",
                  "version": "9.15.1.21"
                },
                {
                  "status": "affected",
                  "version": "9.16.1"
                },
                {
                  "status": "affected",
                  "version": "9.16.1.28"
                },
                {
                  "status": "affected",
                  "version": "9.16.2"
                },
                {
                  "status": "affected",
                  "version": "9.16.2.3"
                },
                {
                  "status": "affected",
                  "version": "9.16.2.7"
                },
                {
                  "status": "affected",
                  "version": "9.16.2.11"
                },
                {
                  "status": "affected",
                  "version": "9.16.2.13"
                },
                {
                  "status": "affected",
                  "version": "9.16.2.14"
                },
                {
                  "status": "affected",
                  "version": "9.16.3"
                },
                {
                  "status": "affected",
                  "version": "9.16.3.3"
                },
                {
                  "status": "affected",
                  "version": "9.16.3.14"
                },
                {
                  "status": "affected",
                  "version": "9.16.3.15"
                },
                {
                  "status": "affected",
                  "version": "9.16.3.19"
                },
                {
                  "status": "affected",
                  "version": "9.16.3.23"
                },
                {
                  "status": "affected",
                  "version": "9.16.4"
                },
                {
                  "status": "affected",
                  "version": "9.16.4.9"
                },
                {
                  "status": "affected",
                  "version": "9.16.4.14"
                },
                {
                  "status": "affected",
                  "version": "9.16.4.18"
                },
                {
                  "status": "affected",
                  "version": "9.16.4.19"
                },
                {
                  "status": "affected",
                  "version": "9.16.4.27"
                },
                {
                  "status": "affected",
                  "version": "9.16.4.38"
                },
                {
                  "status": "affected",
                  "version": "9.16.4.39"
                },
                {
                  "status": "affected",
                  "version": "9.16.4.42"
                },
                {
                  "status": "affected",
                  "version": "9.16.4.48"
                },
                {
                  "status": "affected",
                  "version": "9.16.4.55"
                },
                {
                  "status": "affected",
                  "version": "9.17.1"
                },
                {
                  "status": "affected",
                  "version": "9.17.1.7"
                },
                {
                  "status": "affected",
                  "version": "9.17.1.9"
                },
                {
                  "status": "affected",
                  "version": "9.17.1.10"
                },
                {
                  "status": "affected",
                  "version": "9.17.1.11"
                },
                {
                  "status": "affected",
                  "version": "9.17.1.13"
                },
                {
                  "status": "affected",
                  "version": "9.17.1.15"
                },
                {
                  "status": "affected",
                  "version": "9.17.1.20"
                },
                {
                  "status": "affected",
                  "version": "9.17.1.30"
                },
                {
                  "status": "affected",
                  "version": "9.17.1.33"
                },
                {
                  "status": "affected",
                  "version": "9.18.1"
                },
                {
                  "status": "affected",
                  "version": "9.18.1.3"
                },
                {
                  "status": "affected",
                  "version": "9.18.2"
                },
                {
                  "status": "affected",
                  "version": "9.18.2.5"
                },
                {
                  "status": "affected",
                  "version": "9.18.2.7"
                },
                {
                  "status": "affected",
                  "version": "9.18.2.8"
                },
                {
                  "status": "affected",
                  "version": "9.18.3"
                },
                {
                  "status": "affected",
                  "version": "9.18.3.39"
                },
                {
                  "status": "affected",
                  "version": "9.18.3.46"
                },
                {
                  "status": "affected",
                  "version": "9.18.3.53"
                },
                {
                  "status": "affected",
                  "version": "9.18.3.55"
                },
                {
                  "status": "affected",
                  "version": "9.18.3.56"
                },
                {
                  "status": "affected",
                  "version": "9.18.4"
                },
                {
                  "status": "affected",
                  "version": "9.18.4.5"
                },
                {
                  "status": "affected",
                  "version": "9.18.4.8"
                },
                {
                  "status": "affected",
                  "version": "9.19.1"
                },
                {
                  "status": "affected",
                  "version": "9.19.1.5"
                },
                {
                  "status": "affected",
                  "version": "9.19.1.9"
                },
                {
                  "status": "affected",
                  "version": "9.19.1.12"
                },
                {
                  "status": "affected",
                  "version": "9.19.1.18"
                },
                {
                  "status": "affected",
                  "version": "9.19.1.22"
                },
                {
                  "status": "affected",
                  "version": "9.19.1.24"
                },
                {
                  "status": "affected",
                  "version": "9.19.1.27"
                },
                {
                  "status": "affected",
                  "version": "9.20.1"
                },
                {
                  "status": "affected",
                  "version": "9.20.1.5"
                },
                {
                  "status": "affected",
                  "version": "9.20.2"
                }
              ]
            },
            {
              "product": "Cisco Firepower Threat Defense Software",
              "vendor": "Cisco",
              "versions": [
                {
                  "status": "affected",
                  "version": "6.2.3"
                },
                {
                  "status": "affected",
                  "version": "6.2.3.1"
                },
                {
                  "status": "affected",
                  "version": "6.2.3.2"
                },
                {
                  "status": "affected",
                  "version": "6.2.3.3"
                },
                {
                  "status": "affected",
                  "version": "6.2.3.4"
                },
                {
                  "status": "affected",
                  "version": "6.2.3.5"
                },
                {
                  "status": "affected",
                  "version": "6.2.3.6"
                },
                {
                  "status": "affected",
                  "version": "6.2.3.7"
                },
                {
                  "status": "affected",
                  "version": "6.2.3.8"
                },
                {
                  "status": "affected",
                  "version": "6.2.3.10"
                },
                {
                  "status": "affected",
                  "version": "6.2.3.11"
                },
                {
                  "status": "affected",
                  "version": "6.2.3.9"
                },
                {
                  "status": "affected",
                  "version": "6.2.3.12"
                },
                {
                  "status": "affected",
                  "version": "6.2.3.13"
                },
                {
                  "status": "affected",
                  "version": "6.2.3.14"
                },
                {
                  "status": "affected",
                  "version": "6.2.3.15"
                },
                {
                  "status": "affected",
                  "version": "6.2.3.16"
                },
                {
                  "status": "affected",
                  "version": "6.2.3.17"
                },
                {
                  "status": "affected",
                  "version": "6.2.3.18"
                },
                {
                  "status": "affected",
                  "version": "6.6.0"
                },
                {
                  "status": "affected",
                  "version": "6.6.0.1"
                },
                {
                  "status": "affected",
                  "version": "6.6.1"
                },
                {
                  "status": "affected",
                  "version": "6.6.3"
                },
                {
                  "status": "affected",
                  "version": "6.6.4"
                },
                {
                  "status": "affected",
                  "version": "6.6.5"
                },
                {
                  "status": "affected",
                  "version": "6.6.5.1"
                },
                {
                  "status": "affected",
                  "version": "6.6.5.2"
                },
                {
                  "status": "affected",
                  "version": "6.6.7"
                },
                {
                  "status": "affected",
                  "version": "6.6.7.1"
                },
                {
                  "status": "affected",
                  "version": "6.4.0"
                },
                {
                  "status": "affected",
                  "version": "6.4.0.1"
                },
                {
                  "status": "affected",
                  "version": "6.4.0.3"
                },
                {
                  "status": "affected",
                  "version": "6.4.0.2"
                },
                {
                  "status": "affected",
                  "version": "6.4.0.4"
                },
                {
                  "status": "affected",
                  "version": "6.4.0.5"
                },
                {
                  "status": "affected",
                  "version": "6.4.0.6"
                },
                {
                  "status": "affected",
                  "version": "6.4.0.7"
                },
                {
                  "status": "affected",
                  "version": "6.4.0.8"
                },
                {
                  "status": "affected",
                  "version": "6.4.0.9"
                },
                {
                  "status": "affected",
                  "version": "6.4.0.10"
                },
                {
                  "status": "affected",
                  "version": "6.4.0.11"
                },
                {
                  "status": "affected",
                  "version": "6.4.0.12"
                },
                {
                  "status": "affected",
                  "version": "6.4.0.13"
                },
                {
                  "status": "affected",
                  "version": "6.4.0.14"
                },
                {
                  "status": "affected",
                  "version": "6.4.0.15"
                },
                {
                  "status": "affected",
                  "version": "6.4.0.16"
                },
                {
                  "status": "affected",
                  "version": "6.4.0.17"
                },
                {
                  "status": "affected",
                  "version": "6.7.0"
                },
                {
                  "status": "affected",
                  "version": "6.7.0.1"
                },
                {
                  "status": "affected",
                  "version": "6.7.0.2"
                },
                {
                  "status": "affected",
                  "version": "6.7.0.3"
                },
                {
                  "status": "affected",
                  "version": "7.0.0"
                },
                {
                  "status": "affected",
                  "version": "7.0.0.1"
                },
                {
                  "status": "affected",
                  "version": "7.0.1"
                },
                {
                  "status": "affected",
                  "version": "7.0.1.1"
                },
                {
                  "status": "affected",
                  "version": "7.0.2"
                },
                {
                  "status": "affected",
                  "version": "7.0.2.1"
                },
                {
                  "status": "affected",
                  "version": "7.0.3"
                },
                {
                  "status": "affected",
                  "version": "7.0.4"
                },
                {
                  "status": "affected",
                  "version": "7.0.5"
                },
                {
                  "status": "affected",
                  "version": "7.0.6"
                },
                {
                  "status": "affected",
                  "version": "7.0.6.1"
                },
                {
                  "status": "affected",
                  "version": "7.1.0"
                },
                {
                  "status": "affected",
                  "version": "7.1.0.1"
                },
                {
                  "status": "affected",
                  "version": "7.1.0.2"
                },
                {
                  "status": "affected",
                  "version": "7.1.0.3"
                },
                {
                  "status": "affected",
                  "version": "7.2.0"
                },
                {
                  "status": "affected",
                  "version": "7.2.0.1"
                },
                {
                  "status": "affected",
                  "version": "7.2.1"
                },
                {
                  "status": "affected",
                  "version": "7.2.2"
                },
                {
                  "status": "affected",
                  "version": "7.2.3"
                },
                {
                  "status": "affected",
                  "version": "7.2.4"
                },
                {
                  "status": "affected",
                  "version": "7.2.4.1"
                },
                {
                  "status": "affected",
                  "version": "7.2.5"
                },
                {
                  "status": "affected",
                  "version": "7.2.5.1"
                },
                {
                  "status": "affected",
                  "version": "7.3.0"
                },
                {
                  "status": "affected",
                  "version": "7.3.1"
                },
                {
                  "status": "affected",
                  "version": "7.3.1.1"
                },
                {
                  "status": "affected",
                  "version": "7.4.0"
                },
                {
                  "status": "affected",
                  "version": "7.4.1"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "A vulnerability in the management and VPN web servers for Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition.\r\n\r This vulnerability is due to incomplete error checking when parsing an HTTP header. An attacker could exploit this vulnerability by sending a crafted HTTP request to a targeted web server on a device. A successful exploit could allow the attacker to cause a DoS condition when the device reloads."
            }
          ],
          "exploits": [
            {
              "lang": "en",
              "value": "Cisco has confirmed that this vulnerability has been exploited. Cisco strongly recommends that customers upgrade to fixed software to resolve this vulnerability. Customers are also strongly encouraged to monitor system logs for indicators of undocumented configuration changes, unscheduled reboots, and any anomalous credential activity."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 8.6,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "CHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
                "version": "3.1"
              },
              "format": "cvssV3_1"
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-835",
                  "description": "Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)",
                  "lang": "en",
                  "type": "cwe"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2024-04-24T18:15:57.646Z",
            "orgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
            "shortName": "cisco"
          },
          "references": [
            {
              "name": "cisco-sa-asaftd-websrvs-dos-X8gNucD2",
              "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-websrvs-dos-X8gNucD2"
            }
          ],
          "source": {
            "advisory": "cisco-sa-asaftd-websrvs-dos-X8gNucD2",
            "defects": [
              "CSCwj10955"
            ],
            "discovery": "EXTERNAL"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
        "assignerShortName": "cisco",
        "cveId": "CVE-2024-20353",
        "datePublished": "2024-04-24T18:15:57.646Z",
        "dateReserved": "2023-11-08T15:08:07.647Z",
        "dateUpdated": "2025-10-21T23:05:20.706Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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Detection rules are retrieved from Rulezet.

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Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.


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