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.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact None

Integrity Impact Low

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation none

Automatable yes

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

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

No data.

No data.

No data.

Project Subscriptions

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-aclbypass-dos-CVxVRSvQ cve-icon cve-icon
History

Wed, 04 Mar 2026 18:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 04 Mar 2026 18:00:00 +0000

Type Values Removed Values Added
Description 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.
Title Cisco Secure Firewall Adaptive Security Appliance Software and Cisco Secure Firewall Threat Defense Software Access Control List Bypass Vulnerability
Weaknesses CWE-284
References
Metrics cvssV3_1

{'score': 5.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: cisco

Published:

Updated: 2026-03-04T18:07:54.606Z

Reserved: 2025-10-08T11:59:15.362Z

Link: CVE-2026-20073

cve-icon Vulnrichment

Updated: 2026-03-04T18:07:49.361Z

cve-icon NVD

Status : Received

Published: 2026-03-04T18:16:23.640

Modified: 2026-03-04T18:16:23.640

Link: CVE-2026-20073

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses