What’s Vulnerable › Vulnerabilities
CVE-2026-20050: Cisco Secure Firewall Threat Defense Decryption Policy Denial of Service Vulnerability
- Severity: medium (CVSS 6.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-03-04 · updated 2026-08-11
- Weakness: CWE-404
Description
A vulnerability in the Do Not Decrypt exclusion feature of the SSL decryption feature of Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper memory management during the inspection of TLS 1.2 encrypted traffic. An attacker could exploit this vulnerability by sending crafted TLS 1.2 encrypted traffic through an affected device. A successful exploit could allow the attacker to cause a reload of an affected device. Note: This vulnerability only affects traffic that is encrypted by TLS 1.2. Other versions of TLS are not affected.
Affected products
- Cisco Firepower Threat Defense Software: from 7.1.0 before 7.2.11; from 7.3.0 before 7.4.4; from 7.6.0 before 7.6.4; from 7.7.0 before 7.7.11 — fixed in 7.2.11, 7.4.4, 7.6.4, 7.7.11
How to fix
Upgrade to a fixed version: Cisco Firepower Threat Defense Software 7.2.11, 7.4.4, 7.6.4, 7.7.11. Check the vendor advisory for mitigations.
References
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