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CVE-2026-20349

8.6 high KEV · due 2026-08-14 exploit SSVC exploitation: active Analyzed
NVD · CVE.org · CISA KEV

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.

Fix

Public exploits 1

Each line links to the index that lists it, never to exploit code. Exploit-DB's "verified" and a Metasploit rank of good or better count as verified; a PoC-in-GitHub entry is a repository's claim.

CISA KEV required action · due 2026-08-14

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.

Added to the catalog 2026-08-11. CISA KEV

Patch, vendor advisory and mitigation references on NVD 1

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 8.6 · in KEV · ciscoNVD modified 2026-10-26 13:10

Affected (CPE criteria) 197

  • cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.1:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.1.28:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.2:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.2.3:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.2.7:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.2.11:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.2.13:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.2.14:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.3:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.3.3:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.3.14:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.3.15:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.3.19:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.3.23:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.4:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.4.9:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.4.14:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.4.19:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.4.27:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.4.38:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.4.39:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.4.42:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.4.48:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.4.55:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.4.57:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.4.61:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.4.62:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.4.67:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.4.70:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.4.71:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.4.76:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.4.82:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.4.84:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.4.85:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.4.89:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:adaptive_security_appliance_software:9.16.4.92:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:adaptive_security_appliance_software:9.18.1:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:adaptive_security_appliance_software:9.18.1.3:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:adaptive_security_appliance_software:9.18.2:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:adaptive_security_appliance_software:9.18.2.5:*:*:*:*:*:*:*
  • and 157 more

References 2