Riskcovery

CVE-2026-20349

Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software Remote Access SSL VPN Denial of Service Vulnerability

State
Published
Severity
8.6 High
Published
Aug 11, 2026
Updated
Sep 16, 2026
Reserved
Oct 8, 2025

Read the record on cve.org

Description

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.

Scores

CVSSScoreVectorSource
3.18.6 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:Hcisco

Weaknesses

  • CWE-244 Improper Clearing of Heap Memory Before Release ('Heap Inspection')

Affected Products

ProductVersions
Cisco Secure Firewall Adaptive Security Appliance (ASA) SoftwareCisco
  • 9.16.1Affected
  • 9.16.1.28Affected
  • 9.16.2Affected
  • 9.16.2.3Affected
  • 9.16.2.7Affected
  • 9.16.2.11Affected
  • 9.16.2.13Affected
  • 9.16.2.14Affected
  • 9.16.3.3Affected
  • 9.16.3Affected
  • 9.16.3.14Affected
  • 9.18.1Affected
  • 9.16.3.15Affected
  • 9.18.1.3Affected
  • 9.18.2Affected
  • 9.16.3.19Affected
  • 9.16.3.23Affected
  • 9.18.2.5Affected
  • 9.16.4Affected
  • 9.18.2.7Affected
  • 9.19.1Affected
  • 9.16.4.9Affected
  • 9.18.2.8Affected
  • 9.16.4.14Affected
  • 9.18.3Affected
  • and 107 more versions
Cisco Secure Firewall Threat Defense (FTD) SoftwareCisco
  • 7.0.0Affected
  • 7.0.0.1Affected
  • 7.0.1Affected
  • 7.0.1.1Affected
  • 7.0.2Affected
  • 7.2.0Affected
  • 7.0.2.1Affected
  • 7.0.3Affected
  • 7.2.0.1Affected
  • 7.0.4Affected
  • 7.2.1Affected
  • 7.0.5Affected
  • 7.3.0Affected
  • 7.2.2Affected
  • 7.2.3Affected
  • 7.3.1Affected
  • 7.2.4Affected
  • 7.0.6Affected
  • 7.2.5Affected
  • 7.2.4.1Affected
  • 7.3.1.1Affected
  • 7.4.0Affected
  • 7.0.6.1Affected
  • 7.2.5.1Affected
  • 7.4.1Affected
  • and 36 more versions

References

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