CVE record · CVE-2026-20023

Out-of-bounds write in Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and others

CVSS 6.1 MediumEPSS 0.0017 · 6th percentile

Published by the CVE Program (CNA: cisco) at 4 Mar 2026, 18:35 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Cisco	Cisco Secure Firewall Adaptive Security Appliance (ASA) Software	affected 9.12.1 affected 9.12.1.2 affected 9.12.1.3 affected 9.12.2 affected 9.12.2.4 affected 9.12.2.5 affected 9.12.2.9 affected 9.12.3 affected 9.12.3.2 affected 9.12.3.7 affected 9.12.4 affected 9.12.3.12 and 147 more
Cisco	Cisco Secure Firewall Threat Defense (FTD) Software	affected 6.4.0 affected 6.4.0.1 affected 6.4.0.3 affected 6.4.0.2 affected 6.4.0.4 affected 6.4.0.5 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 and 63 more

Identifiers: CVE-2026-20023
CNA: cisco
Weakness (CWE): CWE-787
Tags: Cisco Secure Firewall Adaptive Security Appliance (ASA) Software
Cisco Secure Firewall Threat Defense (FTD) Software
Memory corruption
Published: 4 Mar 2026
Updated: 4 Mar 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
6.1	Medium	3.1	CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H	CNA (cisco)

CISA KEV Not listed.
EPSS 0.0017, the 6th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 4 Mar 2026. New records show when each source confirmed them.

Sources

References from the CNA

sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-ospf-ZH8PhbSW

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.