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Vulnerabilities

Vulnerability · CVE-2026-20073

A vulnerability in Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthentica…

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-2026-20073. EPSS is 0.40%. 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
Medium5.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.40%
Remediation
Advisory link
Affected products
cpe cisco/adaptive security appliance software · cpe cisco/secure firewall threat defense

A vulnerability in Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to send traffic that should be denied through an affected device. This vulnerability is due to improper error handling when an affected device that is joining a cluster runs out of memory while replicating access control rules. An attacker could exploit this vulnerability by sending traffic that should be blocked through the device. A successful exploit could allow the attacker to bypass access controls and reach devices in protected networks.

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-2026-20073

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-2026-20073. EPSS is 0.40%. 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-284: Improper Access Control. EPSS 0.40%. 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 Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to send traffic that should be denied through an affected device. This vulnerability is due to improper error handling when an affected device that is joining a cluster runs out of memory while replicating access

  2. Aug 11, 2026 · NIST NVD

    Updated

    A vulnerability in Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to send traffic that should be denied through an affected device. This vulnerability is due to improper error handling when an affected device that is joining a cluster runs out of memory while replicating access

Sources

  • CVE.orgVulnerability recordCVE-2026-20073

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-20073

    30-day exploitation probability 0.4%

    first.org
  • NIST NVDVulnerability recordCVE-2026-20073

    A vulnerability in Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to send traffic that should be denied through an affected device. This vulnerability is d

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.