SB2026030446 - Incorrect TLS protocol handling in Cisco Firewall Threat Defense (FTD)
Published: March 4, 2026
Security Bulletin ID
SB2026030446
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Partial DoS
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper error handling (CVE-ID: CVE-2026-20006)
CWE-ID: CWE-388 - Error Handling
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to perform a denial of service attack.
The vulnerability exists due to incorrect error handling in the TLS cryptography functionality of the Snort 3 Detection Engine. A remote attacker can send specially crafted TLS packets to the affected system and perform a denial of service attack.
Remediation
Install update from vendor's website.