🔐 CVE Alert

CVE-2026-20073

MEDIUM 5.8

Cisco Secure Firewall Adaptive Security Appliance Software and Cisco Secure Firewall Threat Defense Software Access Control List Bypass Vulnerability

CVSS Score
5.8
EPSS Score
0.0%
EPSS Percentile
0th

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.

CWE CWE-284
Vendor cisco
Product cisco secure firewall adaptive security appliance (asa) software
Ecosystems
Industries
NetworkingTelecommunications
Published Mar 4, 2026
Last Updated Mar 4, 2026
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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
Low
Availability
None

Affected Versions

Cisco / Cisco Secure Firewall Adaptive Security Appliance (ASA) Software
9.12.3 9.12.1 9.12.2 9.12.4 9.12.3.2 9.12.3.7 9.12.2.5 9.12.3.12 9.12.1.3 9.12.2.4 9.12.1.2 9.12.2.9 9.12.3.9 9.12.2.1 9.12.4.2 9.12.4.4 9.12.4.7 9.12.4.8 9.12.4.10 9.12.4.13 9.12.4.18 9.12.4.24 9.16.1 9.12.4.26 9.16.1.28 9.12.4.29 9.16.2 9.12.4.30 9.16.2.3 9.12.4.35 9.16.2.7 9.12.4.37 9.17.1 9.16.2.11 9.16.2.13 9.12.4.39 9.12.4.38 9.16.2.14 9.17.1.7 9.12.4.40 9.16.3.3 9.16.3 9.16.3.14 9.17.1.9 9.12.4.41 9.17.1.10 9.18.1 9.12.4.47 9.16.3.15 9.18.1.3 9.17.1.11 9.12.4.48 9.18.2 9.16.3.19 9.17.1.13 9.12.4.50 9.17.1.15 9.12.4.52 9.16.3.23 9.18.2.5 9.16.4 9.12.4.54 9.17.1.20 9.18.2.7 9.19.1 9.16.4.9 9.12.4.55 9.18.2.8 9.16.4.14 9.18.3 9.19.1.5 9.12.4.56 9.17.1.30 9.19.1.9 9.18.3.39 9.16.4.19 9.12.4.58 9.19.1.12 9.18.3.46 9.16.4.27 9.19.1.18 9.18.3.53 9.18.3.55 9.16.4.38 9.17.1.33 9.12.4.62 9.16.4.39 9.18.3.56 9.20.1 9.16.4.42 9.19.1.22 9.18.4 9.20.1.5 9.18.4.5 9.19.1.24 9.16.4.48 9.18.4.8 9.20.2 9.19.1.27 9.12.4.65 9.16.4.55 9.18.4.22 9.20.2.10 9.16.4.57 9.19.1.28 9.17.1.39 9.12.4.67 9.18.4.24 9.20.2.21 9.16.4.61 9.19.1.31 9.18.4.29 9.20.2.22 9.16.4.62 9.18.4.34 9.20.3 9.16.4.67 9.16.4.70 9.18.4.40 9.23.1 9.22.1.1 9.16.4.71 9.20.3.4 9.18.4.47 9.20.3.7 9.17.1.45 9.19.1.37 9.17.1.46 9.16.4.76 9.20.3.9 9.19.1.38 9.18.4.50 9.22.1.3 9.20.3.10 9.22.1.2 9.18.4.52 9.20.3.13 9.22.1.6 9.18.4.53 9.16.4.82 9.22.2 9.20.3.16 9.19.1.42 9.18.4.57 9.16.4.84 9.23.1.3 9.20.3.20 9.22.2.4 9.23.1.7 9.20.4 9.22.2.9 9.23.1.13 9.20.4.7 9.22.2.13 9.18.4.66 9.20.4.10 9.23.1.19 9.18.4.67 9.18.4.68
Cisco / Cisco Secure Firewall Threat Defense (FTD) Software
6.4.0.1 6.4.0.2 6.4.0.5 6.4.0 6.4.0.3 6.4.0.4 6.4.0.6 6.4.0.7 6.4.0.8 6.4.0.9 6.4.0.10 6.4.0.11 6.4.0.12 7.0.0 7.0.0.1 7.0.1 7.1.0 6.4.0.13 7.0.1.1 6.4.0.14 7.1.0.1 7.0.2 6.4.0.15 7.2.0 7.0.2.1 7.0.3 7.1.0.2 7.2.0.1 7.0.4 7.2.1 7.0.5 6.4.0.16 7.3.0 7.2.2 7.2.3 7.3.1 7.1.0.3 7.2.4 7.0.6 7.2.5 7.2.4.1 7.3.1.1 7.4.0 6.4.0.17 7.0.6.1 7.2.5.1 7.4.1 7.2.6 7.0.6.2 7.4.1.1 6.4.0.18 7.2.7 7.2.5.2 7.3.1.2 7.2.8 7.6.0 7.4.2 7.2.8.1 7.0.6.3 7.4.2.1 7.2.9 7.0.7 7.7.0 7.4.2.2 7.2.10 7.6.1 7.4.2.3 7.0.8 7.6.2 7.7.10 7.0.8.1 7.6.2.1 7.7.10.1 7.4.2.4 7.2.10.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗
sec.cloudapps.cisco.com: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-aclbypass-dos-CVxVRSvQ