CVE-2026-20006
Severity CVSS v4.0:
Pending analysis
Type:
CWE-388
Error Handling
Publication date:
04/03/2026
Last modified:
05/03/2026
Description
A vulnerability in the TLS cryptography functionality of the Snort 3 Detection Engine of Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to unexpectedly restart, resulting in a denial of service (DoS) condition.<br />
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This vulnerability is due to improper implementation of the TLS protocol. An attacker could exploit this vulnerability by sending a crafted TLS packet to an affected system. A successful exploit could allow the attacker to cause a device that is running Cisco Secure FTD Software to drop network traffic, resulting in a DoS condition.&nbsp;<br />
Note: TLS 1.3 is not affected by this vulnerability.
Impact
Base Score 3.x
5.80
Severity 3.x
MEDIUM