SB2026030448 - Snort deep inspection bypass in Cisco Firewall Threat Defense (FTD)
Published: March 4, 2026
Security Bulletin ID
SB2026030448
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) Protection mechanism failure (CVE-ID: CVE-2026-20007)
CWE-ID: CWE-693 - Protection Mechanism Failure
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 configured Snort rules.
The vulnerability exists due to a logic error in the integration of the Snort Engine rules. A remote attacker can bypass configured Snort rules and allow traffic onto the network that should have been dropped.
Remediation
Install update from vendor's website.