Is CVE-2026-20073 being actively exploited?

CVE-2026-20073 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2026-20073?

CVE-2026-20073 has a CVSS 3.1 base score of 5.8 (MEDIUM).

CVE-2026-20073

MEDIUM · CVSS 5.8EPSS 0.4%EU EUVD

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.

Key facts

CVSS score: 5.8 (v3.1)
Severity: MEDIUM
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Weakness (CWE): CWE-284
EPSS score: 0.4% (32th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2026-9470)
Published: March 4, 2026
NVD last modified: August 11, 2026
Status: Analyzed

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2026-9470 in the EU Vulnerability Database. Last updated in EUVD on March 4, 2026.

View on the EU Vulnerability Database

Affected products

cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
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cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
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cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software
cisco / adaptive security appliance software

and 182 more…

Certified products that may be affected

2 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.

Cisco Secure Firewall Threat Defense (FTD) 7.4 with Secure Firewall Management Center (FMC) 7.4 and Secure Client 5.1 - Cisco Systems, Inc. - Common Criteria NSCIB-CC-2400046-01-CR - active
Cisco Secure Firewall Threat Defense Virtual 7.4 with FMC/FMCv - Cisco Systems, Inc. - Common Criteria CCEVS-VR-VID-11510-2025 - active

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-aclbypass-dos-CVxVRSvQ(Vendor Advisory)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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