KEV Entry

CVE-2026-20349

Known Exploited Vulnerability Entry CISA KEV

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Entry Details
Confirmed Exploited

CVE-2026-20349

2026-08-11 00:00 UTC

Timestamps

2026-08-11

2026-08-11

Scope

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

References
  • {'id': 'CVE-2026-20349', 'url': 'https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2026-20349'}

62304d5b-0868-4905-b5fa-5c8b94c3ec8a

CISA KEV
405284c2-e461-4670-8979-7fd2c9755a60

2026-08-11 20:00 UTC

2026-08-11 20:00 UTC

Evidence
1
Type Source Signal Confidence Details GCVE Metadata
vendor_report cisa-kev successful_exploitation 0.80
View details 
{
  "cwes": [
    "CWE-244"
  ],
  "date_added": "2026-08-11",
  "due_date": "2026-08-14",
  "feed": "CISA Known Exploited Vulnerabilities Catalog",
  "knownRansomwareCampaignUse": "Unknown",
  "product": "Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) ",
  "vendorProject": "Cisco",
  "vulnerabilityName": "Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Heap Inspection Vulnerability"
}
 -
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