SB2026031046 - Denial of service when decrypting TLS 1.2 traffic in Cisco Secure Firewall Threat Defense
Published: March 10, 2026
Security Bulletin ID
SB2026031046
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper resource shutdown or release (CVE-ID: CVE-2026-20050)
CWE-ID: CWE-404 - Improper Resource Shutdown or Release
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/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 improper memory management within the Do Not Decrypt exclusion option of the SSL decryption feature. A remote attacker can send specially crafted TLS 1.2 encrypted traffic through an affected device and perform a denial of service attack.
Remediation
Install update from vendor's website.