Improper resource shutdown or release in Cisco Firewall Threat Defense (FTD) - CVE-2026-20050

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Main Vulnerability Database Vulnerabilities #VU123676

Improper resource shutdown or release in Cisco Firewall Threat Defense (FTD) - CVE-2026-20050

Published: March 10, 2026


Vulnerability identifier: #VU123676
CSH Severity: Medium
CVSS v4.0: 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
CVE-ID: CVE-2026-20050
CWE-ID: CWE-404
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: Cisco Systems, Inc
Affected software:
Cisco Firewall Threat Defense (FTD)

Detailed vulnerability description

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.


How to mitigate CVE-2026-20050

Install updates from vendor's website.

Sources