CVE-2026-20069Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software VPN Web Services Client-Side Request Smuggling Vulnerability

Description

A vulnerability in the VPN web services component of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to conduct browser-based attacks against users of an affected device. This vulnerability is due to improper validation of HTTP requests. An attacker could exploit this vulnerability by persuading a user to visit a website that is designed to pass malicious HTTP requests to a device that is running Cisco Secure Firewall ASA Software or Cisco Secure FTD Software and has web services endpoints supporting VPN features enabled. A successful exploit could allow the attacker to reflect malicious input from the affected device to the browser that is in use and conduct browser-based attacks, including cross-site scripting (XSS) attacks. The attacker is not able to directly impact the affected device.

Timeline

Scores

EPSS (exploitation in 30 days)

0.32% · top 75% of all CVEs (15 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.3.

Affected products

• Cisco · Cisco Secure Firewall Adaptive Security Appliance (ASA) Software

  • affected 9.12.3
  • affected 9.12.1
  • affected 9.12.2
  • affected 9.12.4
  • affected 9.12.3.2
  • affected 9.12.3.7
  • affected 9.12.2.5
  • affected 9.12.3.12
  • affected 9.12.1.3
  • affected 9.12.2.4
  • affected 9.12.1.2
  • affected 9.12.2.9
  • 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 9.12.4.8
  • affected 9.12.4.10
  • affected 9.12.4.13
  • affected 9.12.4.18
  • affected 9.12.4.24
  • affected 9.16.1
  • affected 9.12.4.26
  • affected 9.16.1.28
  • affected 9.12.4.29
  • affected 9.16.2
  • affected 9.12.4.30
  • affected 9.16.2.3
  • affected 9.12.4.35
  • affected 9.16.2.7
  • affected 9.12.4.37
  • affected 9.17.1
  • affected 9.16.2.11
  • affected 9.16.2.13
  • affected 9.12.4.39
  • affected 9.12.4.38
  • affected 9.16.2.14
  • affected 9.17.1.7
  • affected 9.12.4.40
  • and 111 more

• Cisco · Cisco Secure Firewall Threat Defense (FTD) Software

  • affected 6.4.0.1
  • affected 6.4.0.2
  • affected 6.4.0.5
  • affected 6.4.0
  • affected 6.4.0.3
  • affected 6.4.0.4
  • 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 7.0.0
  • affected 7.0.0.1
  • affected 7.0.1
  • affected 7.1.0
  • affected 6.4.0.13
  • affected 7.0.1.1
  • affected 6.4.0.14
  • affected 7.1.0.1
  • affected 7.0.2
  • affected 6.4.0.15
  • affected 7.2.0
  • affected 7.0.2.1
  • affected 7.0.3
  • affected 7.1.0.2
  • affected 7.2.0.1
  • affected 7.0.4
  • affected 7.2.1
  • affected 7.0.5
  • affected 6.4.0.16
  • affected 7.3.0
  • affected 7.2.2
  • affected 7.2.3
  • affected 7.3.1
  • affected 7.1.0.3
  • affected 7.2.4
  • affected 7.0.6
  • affected 7.2.5
  • and 35 more

What to do

Exploitation: The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• EUVD EUVD-2026-9468 (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2026-20069](https://cveledger.app/badge/CVE-2026-20069.svg)](https://cveledger.app/cve/CVE-2026-20069)

Record last updated 4 Mar 2026, 20:24 UTC.