CVE-2026-20050

Cisco Secure Firewall Threat Defense Decryption Policy Denial of Service Vulnerability

State: Published
Severity: 6.8 Medium
Published: Mar 4, 2026
Updated: Mar 4, 2026
Reserved: Oct 8, 2025

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.

Scores

CVSS	Score	Vector	Source
3.1	6.8 Medium	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H	cisco

Weaknesses

CWE-404 Improper Resource Shutdown or Release

Affected Products

Product	Versions
Cisco Secure Firewall Threat Defense (FTD) SoftwareCisco	7.0.0Affected 7.0.0.1Affected 7.0.1Affected 7.1.0Affected 7.0.1.1Affected 7.1.0.1Affected 7.0.2Affected 7.2.0Affected 7.0.2.1Affected 7.0.3Affected 7.1.0.2Affected 7.2.0.1Affected 7.0.4Affected 7.2.1Affected 7.0.5Affected 7.3.0Affected 7.2.2Affected 7.2.3Affected 7.3.1Affected 7.1.0.3Affected 7.2.4Affected 7.0.6Affected 7.2.5Affected 7.2.4.1Affected 7.3.1.1Affected and 33 more versions

References

cisco-sa-ftd-dnd-dos-bpEcg7B7

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