SB2026030960 - Traffic ACL bypass in Cisco ASA and Cisco FTD
Published: March 9, 2026
Security Bulletin ID
SB2026030960
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper access control (CVE-ID: CVE-2026-20073)
CWE-ID: CWE-284 - Improper Access Control
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due to improper error handling when an affected device that is joining a cluster runs out of memory while replicating access control rules. A remote attacker can bypass implemented access controls and reach devices in protected networks.
Remediation
Install update from vendor's website.