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Vulnerabilities

Vulnerability · CVE-2026-20070

A vulnerability in the VPN web services component of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) So…

Published Mar 4, 2026 · catalog updated Aug 11, 2026 · adaptive security appliance software

Check if you run it

No confirmed exploitation is on record for CVE-2026-20070. EPSS is 0.28%. Act only if a listed version of adaptive security appliance software is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium6.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.28%
Remediation
Advisory link
Affected products
cpe cisco/adaptive security appliance software · cpe cisco/secure firewall threat defense

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 a cross-site scripting (XSS) attack against a browser that is accessing an affected device. This vulnerability is due to improper validation of user-supplied input in HTTP requests. An attacker could exploit this vulnerability by persuading a user to follow a link to a malicious website that is designed to submit malicious input to the affected application. A successful exploit could allow the attacker to execute arbitrary HTML or script code in the browser in the context of the VPN web server.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe cisco/adaptive security appliance software9.12.1
  • cpe cisco/adaptive security appliance software9.12.1.2
  • cpe cisco/adaptive security appliance software9.12.1.3
  • cpe cisco/adaptive security appliance software9.12.2
  • cpe cisco/adaptive security appliance software9.12.2.1
  • cpe cisco/adaptive security appliance software9.12.2.4
  • cpe cisco/adaptive security appliance software9.12.2.5
  • cpe cisco/adaptive security appliance software9.12.2.9
  • cpe cisco/secure firewall threat defense6.4.0

How to fix CVE-2026-20070

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-20070. EPSS is 0.28%. Act only if a listed version of adaptive security appliance software is installed.

Which versions are affected?

Compare what you have installed with cisco/adaptive security appliance software 9.12.1; cisco/adaptive security appliance software 9.12.1.2; cisco/adaptive security appliance software 9.12.1.3; cisco/adaptive security appliance software 9.12.2. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-80: Basic XSS. EPSS 0.28%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Cisco security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 4, 2026 · NIST NVD

    Detected

    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 a cross-site scripting (XSS) attack against a browser that is accessing an affected device. This vulnerability is due to improper validation of user-supplied input in

  2. Aug 11, 2026 · NIST NVD

    Updated

    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 a cross-site scripting (XSS) attack against a browser that is accessing an affected device. This vulnerability is due to improper validation of user-supplied input in

Sources

  • CVE.orgVulnerability recordCVE-2026-20070

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-20070

    30-day exploitation probability 0.28%

    first.org
  • NIST NVDVulnerability recordCVE-2026-20070

    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 a cross-site scripting (XSS) attack against a b

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 23, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.