CVE-2026-20349 (GCVE-0-2026-20349)
Vulnerability from cvelistv5 – Published: 2026-08-11 17:06 – Updated: 2026-08-12 04:00Title
Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software Remote Access SSL VPN Denial of Service Vulnerability
Summary
A vulnerability in the Remote Access SSL VPN service for Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall 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 insufficient error checking when processing HTTP requests. An attacker could exploit this vulnerability by sending a crafted HTTP request to the Remote Access SSL VPN service on an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition.
Severity
8.6 (High)
SSVC
Exploitation: active
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-11 00:00 UTC
CWE
- CWE-244 - Improper Clearing of Heap Memory Before Release ('Heap Inspection')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://sec.cloudapps.cisco.com/security/center/c… | |
| https://www.cisa.gov/known-exploited-vulnerabilit… | government-resource |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Cisco | Cisco Secure Firewall Adaptive Security Appliance (ASA) Software |
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: 9.16.3.3 Affected: 9.16.3 Affected: 9.16.3.14 Affected: 9.18.1 Affected: 9.16.3.15 Affected: 9.18.1.3 Affected: 9.18.2 Affected: 9.16.3.19 Affected: 9.16.3.23 Affected: 9.18.2.5 Affected: 9.16.4 Affected: 9.18.2.7 Affected: 9.19.1 Affected: 9.16.4.9 Affected: 9.18.2.8 Affected: 9.16.4.14 Affected: 9.18.3 Affected: 9.19.1.5 Affected: 9.19.1.9 Affected: 9.18.3.39 Affected: 9.16.4.19 Affected: 9.19.1.12 Affected: 9.18.3.46 Affected: 9.16.4.27 Affected: 9.19.1.18 Affected: 9.18.3.53 Affected: 9.18.3.55 Affected: 9.16.4.38 Affected: 9.16.4.39 Affected: 9.18.3.56 Affected: 9.20.1 Affected: 9.16.4.42 Affected: 9.19.1.22 Affected: 9.18.4 Affected: 9.20.1.5 Affected: 9.18.4.5 Affected: 9.19.1.24 Affected: 9.16.4.48 Affected: 9.18.4.8 Affected: 9.20.2 Affected: 9.19.1.27 Affected: 9.16.4.55 Affected: 9.18.4.22 Affected: 9.20.2.10 Affected: 9.16.4.57 Affected: 9.19.1.28 Affected: 9.18.4.24 Affected: 9.20.2.21 Affected: 9.16.4.61 Affected: 9.19.1.31 Affected: 9.18.4.29 Affected: 9.20.2.22 Affected: 9.16.4.62 Affected: 9.18.4.34 Affected: 9.20.3 Affected: 9.16.4.67 Affected: 9.16.4.70 Affected: 9.18.4.40 Affected: 9.23.1 Affected: 9.22.1.1 Affected: 9.16.4.71 Affected: 9.20.3.4 Affected: 9.18.4.47 Affected: 9.20.3.7 Affected: 9.19.1.37 Affected: 9.16.4.76 Affected: 9.20.3.9 Affected: 9.19.1.38 Affected: 9.18.4.50 Affected: 9.22.1.3 Affected: 9.20.3.10 Affected: 9.22.1.2 Affected: 9.18.4.52 Affected: 9.20.3.13 Affected: 9.22.1.6 Affected: 9.18.4.53 Affected: 9.16.4.82 Affected: 9.22.2 Affected: 9.20.3.16 Affected: 9.19.1.42 Affected: 9.18.4.57 Affected: 9.16.4.84 Affected: 9.23.1.3 Affected: 9.20.3.20 Affected: 9.22.2.4 Affected: 9.23.1.7 Affected: 9.20.4 Affected: 9.22.2.9 Affected: 9.23.1.13 Affected: 9.20.4.7 Affected: 9.22.2.13 Affected: 9.18.4.66 Affected: 9.20.4.10 Affected: 9.23.1.19 Affected: 9.16.4.85 Affected: 9.22.2.14 Affected: 9.18.4.67 Affected: 9.24.1 Affected: 9.18.4.68 Affected: 9.23.1.22 Affected: 9.20.4.14 Affected: 9.22.2.20 Affected: 9.18.4.71 Affected: 9.20.4.19 Affected: 9.23.1.26 Affected: 9.16.4.89 Affected: 9.22.2.32 Affected: 9.18.4.76 Affected: 9.22.3 Affected: 9.24.1.5 Affected: 9.20.4.22 Affected: 9.24.1.9 Affected: 9.20.4.28 Affected: 9.22.3.5 Affected: 9.16.4.92 Affected: 9.18.4.135 Affected: 9.23.1.195 Affected: 9.20.4.30 Affected: 9.24.1.155 Affected: 9.23.1.32 Affected: 9.24.1.11 Affected: 9.20.4.34 Affected: 9.18.4.82 Affected: 9.18.4.90 Affected: 9.20.4.46 |
|
| Cisco | Cisco Secure Firewall Threat Defense (FTD) Software |
Affected:
7.0.0
Affected: 7.0.0.1 Affected: 7.0.1 Affected: 7.0.1.1 Affected: 7.0.2 Affected: 7.2.0 Affected: 7.0.2.1 Affected: 7.0.3 Affected: 7.2.0.1 Affected: 7.0.4 Affected: 7.2.1 Affected: 7.0.5 Affected: 7.3.0 Affected: 7.2.2 Affected: 7.2.3 Affected: 7.3.1 Affected: 7.2.4 Affected: 7.0.6 Affected: 7.2.5 Affected: 7.2.4.1 Affected: 7.3.1.1 Affected: 7.4.0 Affected: 7.0.6.1 Affected: 7.2.5.1 Affected: 7.4.1 Affected: 7.2.6 Affected: 7.0.6.2 Affected: 7.4.1.1 Affected: 7.2.7 Affected: 7.2.5.2 Affected: 7.3.1.2 Affected: 7.2.8 Affected: 7.6.0 Affected: 7.4.2 Affected: 7.2.8.1 Affected: 7.0.6.3 Affected: 7.4.2.1 Affected: 7.2.9 Affected: 7.0.7 Affected: 7.7.0 Affected: 7.4.2.2 Affected: 7.2.10 Affected: 7.6.1 Affected: 7.4.2.3 Affected: 7.0.8 Affected: 7.6.2 Affected: 7.7.10 Affected: 7.7.11 Affected: 7.0.8.1 Affected: 7.6.2.1 Affected: 7.7.10.1 Affected: 7.4.2.4 Affected: 7.2.10.2 Affected: 7.4.3 Affected: 7.6.4 Affected: 10.0.0 Affected: 7.4.4 Affected: 7.0.9 Affected: 7.2.11 Affected: 7.4.7 Affected: 7.4.8 Affected: 7.2.12 Affected: 7.7.13 Affected: 10.0.2 |
CISA KEV
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 62304d5b-0868-4905-b5fa-5c8b94c3ec8a
Exploited: Yes
Timestamps
First Seen: 2026-08-11
Asserted: 2026-08-11
Scope
Notes: Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Heap Inspection Vulnerability | Affected: Cisco / Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) | Description: Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) contain a heap inspection vulnerability that could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition. | Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines. | Due date: 2026-08-14 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-vpn-dos-dzv4mQFF ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-20349
Evidence
Type: Vendor Report
Signal: Successful Exploitation
Confidence: 80%
Source: cisa-kev
Details
| Cwes | CWE-244 |
|---|---|
| Feed | CISA Known Exploited Vulnerabilities Catalog |
| Product | Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) |
| Due Date | 2026-08-14 |
| Date Added | 2026-08-11 |
| Vendorproject | Cisco |
| Vulnerabilityname | Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Heap Inspection Vulnerability |
| Knownransomwarecampaignuse | Unknown |
References
Created: 2026-08-11 20:00 UTC
| Updated: 2026-08-11 20:00 UTC
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"value": "A vulnerability in the Remote Access SSL VPN service for Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall 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.\u0026nbsp;\r\n\r\nThis vulnerability is due to insufficient error checking when processing HTTP requests. An attacker could exploit this vulnerability by sending a crafted HTTP request to the Remote Access SSL VPN service on an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition."
}
],
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{
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"value": "In August 2026, the Cisco Product Security Incident Response Team (PSIRT) became aware of active exploitation of this vulnerability. Cisco strongly recommends that customers upgrade to a fixed software release to remediate this vulnerability."
}
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{
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}
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],
"discovery": "EXTERNAL"
},
"title": "Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software Remote Access SSL VPN Denial of Service Vulnerability"
}
},
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"datePublished": "2026-08-11T17:06:03.091Z",
"dateReserved": "2025-10-08T11:59:15.413Z",
"dateUpdated": "2026-08-12T04:00:28.075Z",
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"cwes": "[\"CWE-244\"]",
"dateAdded": "2026-08-11",
"dueDate": "2026-08-14",
"knownRansomwareCampaignUse": "Unknown",
"notes": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-vpn-dos-dzv4mQFF ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-20349",
"product": "Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) ",
"requiredAction": "Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA\u2019s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA\u2019s \u201cForensics Triage Requirements\u201d (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset\u0027s internet exposure and ensuring adherence to BOD 26-04 patching guidelines.",
"shortDescription": "Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) contain a heap inspection vulnerability that could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition.",
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"containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-20349\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"active\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-08-11T19:40:06.134027Z\"}}}, {\"other\": {\"type\": \"kev\", \"content\": {\"dateAdded\": \"2026-08-11\", \"reference\": \"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20349\"}}}], \"references\": [{\"url\": \"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20349\", \"tags\": [\"government-resource\"]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-08-11T17:33:54.620Z\"}, \"timeline\": [{\"lang\": \"en\", \"time\": \"2026-08-11T00:00:00.000Z\", \"value\": \"CVE-2026-20349 added to CISA KEV\"}]}], \"cna\": {\"title\": \"Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software Remote Access SSL VPN Denial of Service Vulnerability\", \"source\": {\"defects\": [\"CSCwv96220\"], \"advisory\": \"cisco-sa-asaftd-vpn-dos-dzv4mQFF\", \"discovery\": \"EXTERNAL\"}, \"metrics\": [{\"format\": \"cvssV3_1\", \"cvssV3_1\": {\"scope\": \"CHANGED\", \"version\": \"3.1\", \"baseScore\": 8.6, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}], \"affected\": [{\"vendor\": \"Cisco\", \"product\": \"Cisco Secure Firewall Adaptive Security Appliance (ASA) Software\", \"versions\": [{\"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\": \"9.16.3.3\"}, {\"status\": \"affected\", \"version\": \"9.16.3\"}, {\"status\": \"affected\", \"version\": \"9.16.3.14\"}, {\"status\": \"affected\", \"version\": \"9.18.1\"}, {\"status\": \"affected\", \"version\": \"9.16.3.15\"}, {\"status\": \"affected\", \"version\": \"9.18.1.3\"}, {\"status\": \"affected\", \"version\": \"9.18.2\"}, {\"status\": \"affected\", \"version\": \"9.16.3.19\"}, {\"status\": \"affected\", \"version\": \"9.16.3.23\"}, {\"status\": \"affected\", \"version\": \"9.18.2.5\"}, {\"status\": \"affected\", \"version\": \"9.16.4\"}, {\"status\": \"affected\", \"version\": \"9.18.2.7\"}, {\"status\": \"affected\", \"version\": \"9.19.1\"}, {\"status\": \"affected\", \"version\": \"9.16.4.9\"}, {\"status\": \"affected\", \"version\": \"9.18.2.8\"}, {\"status\": \"affected\", \"version\": \"9.16.4.14\"}, {\"status\": \"affected\", \"version\": \"9.18.3\"}, {\"status\": \"affected\", \"version\": \"9.19.1.5\"}, {\"status\": \"affected\", \"version\": \"9.19.1.9\"}, {\"status\": \"affected\", \"version\": \"9.18.3.39\"}, {\"status\": \"affected\", \"version\": \"9.16.4.19\"}, {\"status\": \"affected\", \"version\": \"9.19.1.12\"}, {\"status\": \"affected\", \"version\": \"9.18.3.46\"}, {\"status\": \"affected\", \"version\": \"9.16.4.27\"}, {\"status\": \"affected\", \"version\": \"9.19.1.18\"}, {\"status\": \"affected\", \"version\": \"9.18.3.53\"}, {\"status\": \"affected\", \"version\": \"9.18.3.55\"}, {\"status\": \"affected\", \"version\": \"9.16.4.38\"}, {\"status\": \"affected\", \"version\": \"9.16.4.39\"}, {\"status\": \"affected\", \"version\": \"9.18.3.56\"}, {\"status\": \"affected\", \"version\": \"9.20.1\"}, {\"status\": \"affected\", \"version\": \"9.16.4.42\"}, {\"status\": \"affected\", \"version\": \"9.19.1.22\"}, {\"status\": \"affected\", \"version\": \"9.18.4\"}, {\"status\": \"affected\", \"version\": \"9.20.1.5\"}, {\"status\": \"affected\", \"version\": \"9.18.4.5\"}, {\"status\": \"affected\", \"version\": \"9.19.1.24\"}, {\"status\": \"affected\", \"version\": \"9.16.4.48\"}, {\"status\": \"affected\", \"version\": \"9.18.4.8\"}, {\"status\": \"affected\", \"version\": \"9.20.2\"}, {\"status\": \"affected\", \"version\": \"9.19.1.27\"}, {\"status\": \"affected\", \"version\": \"9.16.4.55\"}, {\"status\": \"affected\", \"version\": \"9.18.4.22\"}, {\"status\": \"affected\", \"version\": \"9.20.2.10\"}, {\"status\": \"affected\", \"version\": \"9.16.4.57\"}, {\"status\": \"affected\", \"version\": \"9.19.1.28\"}, {\"status\": \"affected\", \"version\": \"9.18.4.24\"}, {\"status\": \"affected\", \"version\": \"9.20.2.21\"}, {\"status\": \"affected\", \"version\": \"9.16.4.61\"}, {\"status\": \"affected\", \"version\": \"9.19.1.31\"}, {\"status\": \"affected\", \"version\": \"9.18.4.29\"}, {\"status\": \"affected\", \"version\": \"9.20.2.22\"}, {\"status\": \"affected\", \"version\": \"9.16.4.62\"}, {\"status\": \"affected\", \"version\": \"9.18.4.34\"}, {\"status\": \"affected\", \"version\": \"9.20.3\"}, {\"status\": \"affected\", \"version\": \"9.16.4.67\"}, {\"status\": \"affected\", \"version\": \"9.16.4.70\"}, {\"status\": \"affected\", \"version\": \"9.18.4.40\"}, {\"status\": \"affected\", \"version\": \"9.23.1\"}, {\"status\": \"affected\", \"version\": \"9.22.1.1\"}, {\"status\": \"affected\", \"version\": \"9.16.4.71\"}, {\"status\": \"affected\", \"version\": \"9.20.3.4\"}, {\"status\": \"affected\", \"version\": \"9.18.4.47\"}, {\"status\": \"affected\", \"version\": \"9.20.3.7\"}, {\"status\": \"affected\", \"version\": \"9.19.1.37\"}, {\"status\": \"affected\", \"version\": \"9.16.4.76\"}, {\"status\": \"affected\", \"version\": \"9.20.3.9\"}, {\"status\": \"affected\", \"version\": \"9.19.1.38\"}, {\"status\": \"affected\", \"version\": \"9.18.4.50\"}, {\"status\": \"affected\", \"version\": \"9.22.1.3\"}, {\"status\": \"affected\", \"version\": \"9.20.3.10\"}, {\"status\": \"affected\", \"version\": \"9.22.1.2\"}, {\"status\": \"affected\", \"version\": \"9.18.4.52\"}, {\"status\": \"affected\", \"version\": \"9.20.3.13\"}, {\"status\": \"affected\", \"version\": \"9.22.1.6\"}, {\"status\": \"affected\", \"version\": \"9.18.4.53\"}, {\"status\": \"affected\", \"version\": \"9.16.4.82\"}, {\"status\": \"affected\", \"version\": \"9.22.2\"}, {\"status\": \"affected\", \"version\": \"9.20.3.16\"}, {\"status\": \"affected\", \"version\": \"9.19.1.42\"}, {\"status\": \"affected\", \"version\": \"9.18.4.57\"}, {\"status\": \"affected\", \"version\": \"9.16.4.84\"}, {\"status\": \"affected\", \"version\": \"9.23.1.3\"}, {\"status\": \"affected\", \"version\": \"9.20.3.20\"}, {\"status\": \"affected\", \"version\": \"9.22.2.4\"}, {\"status\": \"affected\", \"version\": \"9.23.1.7\"}, {\"status\": \"affected\", \"version\": \"9.20.4\"}, {\"status\": \"affected\", \"version\": \"9.22.2.9\"}, {\"status\": \"affected\", \"version\": \"9.23.1.13\"}, {\"status\": \"affected\", \"version\": \"9.20.4.7\"}, {\"status\": \"affected\", \"version\": \"9.22.2.13\"}, {\"status\": \"affected\", \"version\": \"9.18.4.66\"}, {\"status\": \"affected\", \"version\": \"9.20.4.10\"}, {\"status\": \"affected\", \"version\": \"9.23.1.19\"}, {\"status\": \"affected\", \"version\": \"9.16.4.85\"}, {\"status\": \"affected\", \"version\": \"9.22.2.14\"}, {\"status\": \"affected\", \"version\": \"9.18.4.67\"}, {\"status\": \"affected\", \"version\": \"9.24.1\"}, {\"status\": \"affected\", \"version\": \"9.18.4.68\"}, {\"status\": \"affected\", \"version\": \"9.23.1.22\"}, {\"status\": \"affected\", \"version\": \"9.20.4.14\"}, {\"status\": \"affected\", \"version\": \"9.22.2.20\"}, {\"status\": \"affected\", \"version\": \"9.18.4.71\"}, {\"status\": \"affected\", \"version\": \"9.20.4.19\"}, {\"status\": \"affected\", \"version\": \"9.23.1.26\"}, {\"status\": \"affected\", \"version\": \"9.16.4.89\"}, {\"status\": \"affected\", \"version\": \"9.22.2.32\"}, {\"status\": \"affected\", \"version\": \"9.18.4.76\"}, {\"status\": \"affected\", \"version\": \"9.22.3\"}, {\"status\": \"affected\", \"version\": \"9.24.1.5\"}, {\"status\": \"affected\", \"version\": \"9.20.4.22\"}, {\"status\": \"affected\", \"version\": \"9.24.1.9\"}, {\"status\": \"affected\", \"version\": \"9.20.4.28\"}, {\"status\": \"affected\", \"version\": \"9.22.3.5\"}, {\"status\": \"affected\", \"version\": \"9.16.4.92\"}, {\"status\": \"affected\", \"version\": \"9.18.4.135\"}, {\"status\": \"affected\", \"version\": \"9.23.1.195\"}, {\"status\": \"affected\", \"version\": \"9.20.4.30\"}, {\"status\": \"affected\", \"version\": \"9.24.1.155\"}, {\"status\": \"affected\", \"version\": \"9.23.1.32\"}, {\"status\": \"affected\", \"version\": \"9.24.1.11\"}, {\"status\": \"affected\", \"version\": \"9.20.4.34\"}, {\"status\": \"affected\", \"version\": \"9.18.4.82\"}, {\"status\": \"affected\", \"version\": \"9.18.4.90\"}, {\"status\": \"affected\", \"version\": \"9.20.4.46\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Cisco\", \"product\": \"Cisco Secure Firewall Threat Defense (FTD) Software\", \"versions\": [{\"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\": \"7.2.0\"}, {\"status\": \"affected\", \"version\": \"7.0.2.1\"}, {\"status\": \"affected\", \"version\": \"7.0.3\"}, {\"status\": \"affected\", \"version\": \"7.2.0.1\"}, {\"status\": \"affected\", \"version\": \"7.0.4\"}, {\"status\": \"affected\", \"version\": \"7.2.1\"}, {\"status\": \"affected\", \"version\": \"7.0.5\"}, {\"status\": \"affected\", \"version\": \"7.3.0\"}, {\"status\": \"affected\", \"version\": \"7.2.2\"}, {\"status\": \"affected\", \"version\": \"7.2.3\"}, {\"status\": \"affected\", \"version\": \"7.3.1\"}, {\"status\": \"affected\", \"version\": \"7.2.4\"}, {\"status\": \"affected\", \"version\": \"7.0.6\"}, {\"status\": \"affected\", \"version\": \"7.2.5\"}, {\"status\": \"affected\", \"version\": \"7.2.4.1\"}, {\"status\": \"affected\", \"version\": \"7.3.1.1\"}, {\"status\": \"affected\", \"version\": \"7.4.0\"}, {\"status\": \"affected\", \"version\": \"7.0.6.1\"}, {\"status\": \"affected\", \"version\": \"7.2.5.1\"}, {\"status\": \"affected\", \"version\": \"7.4.1\"}, {\"status\": \"affected\", \"version\": \"7.2.6\"}, {\"status\": \"affected\", \"version\": \"7.0.6.2\"}, {\"status\": \"affected\", \"version\": \"7.4.1.1\"}, {\"status\": \"affected\", \"version\": \"7.2.7\"}, {\"status\": \"affected\", \"version\": \"7.2.5.2\"}, {\"status\": \"affected\", \"version\": \"7.3.1.2\"}, {\"status\": \"affected\", \"version\": \"7.2.8\"}, {\"status\": \"affected\", \"version\": \"7.6.0\"}, {\"status\": \"affected\", \"version\": \"7.4.2\"}, {\"status\": \"affected\", \"version\": \"7.2.8.1\"}, {\"status\": \"affected\", \"version\": \"7.0.6.3\"}, {\"status\": \"affected\", \"version\": \"7.4.2.1\"}, {\"status\": \"affected\", \"version\": \"7.2.9\"}, {\"status\": \"affected\", \"version\": \"7.0.7\"}, {\"status\": \"affected\", \"version\": \"7.7.0\"}, {\"status\": \"affected\", \"version\": \"7.4.2.2\"}, {\"status\": \"affected\", \"version\": \"7.2.10\"}, {\"status\": \"affected\", \"version\": \"7.6.1\"}, {\"status\": \"affected\", \"version\": \"7.4.2.3\"}, {\"status\": \"affected\", \"version\": \"7.0.8\"}, {\"status\": \"affected\", \"version\": \"7.6.2\"}, {\"status\": \"affected\", \"version\": \"7.7.10\"}, {\"status\": \"affected\", \"version\": \"7.7.11\"}, {\"status\": \"affected\", \"version\": \"7.0.8.1\"}, {\"status\": \"affected\", \"version\": \"7.6.2.1\"}, {\"status\": \"affected\", \"version\": \"7.7.10.1\"}, {\"status\": \"affected\", \"version\": \"7.4.2.4\"}, {\"status\": \"affected\", \"version\": \"7.2.10.2\"}, {\"status\": \"affected\", \"version\": \"7.4.3\"}, {\"status\": \"affected\", \"version\": \"7.6.4\"}, {\"status\": \"affected\", \"version\": \"10.0.0\"}, {\"status\": \"affected\", \"version\": \"7.4.4\"}, {\"status\": \"affected\", \"version\": \"7.0.9\"}, {\"status\": \"affected\", \"version\": \"7.2.11\"}, {\"status\": \"affected\", \"version\": \"7.4.7\"}, {\"status\": \"affected\", \"version\": \"7.4.8\"}, {\"status\": \"affected\", \"version\": \"7.2.12\"}, {\"status\": \"affected\", \"version\": \"7.7.13\"}, {\"status\": \"affected\", \"version\": \"10.0.2\"}], \"defaultStatus\": \"unknown\"}], \"exploits\": [{\"lang\": \"en\", \"value\": \"In August 2026, the Cisco Product Security Incident Response Team (PSIRT) became aware of active exploitation of this vulnerability. Cisco strongly recommends that customers upgrade to a fixed software release to remediate this vulnerability.\"}], \"references\": [{\"url\": \"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-vpn-dos-dzv4mQFF\", \"name\": \"cisco-sa-asaftd-vpn-dos-dzv4mQFF\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"A vulnerability in the Remote Access SSL VPN service for Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall 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.\u0026nbsp;\\r\\n\\r\\nThis vulnerability is due to insufficient error checking when processing HTTP requests. An attacker could exploit this vulnerability by sending a crafted HTTP request to the Remote Access SSL VPN service on an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"cwe\", \"cweId\": \"CWE-244\", \"description\": \"Improper Clearing of Heap Memory Before Release (\u0027Heap Inspection\u0027)\"}]}], \"providerMetadata\": {\"orgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"shortName\": \"cisco\", \"dateUpdated\": \"2026-08-11T17:06:03.091Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-20349\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-12T04:00:28.075Z\", \"dateReserved\": \"2025-10-08T11:59:15.413Z\", \"assignerOrgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"datePublished\": \"2026-08-11T17:06:03.091Z\", \"assignerShortName\": \"cisco\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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