Buffer Access with Incorrect Length Value in Cisco Secure Firewall Threat Defense (FTD) - CVE-2026-20290
Published: September 17, 2026
Vulnerability identifier: #VU150678
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-20290
CWE-ID: CWE-805
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to incomplete validation in SSL/TLS certificate parsing in the Snort 2 Detection Engine. A remote attacker can send a specially crafted SSL connection setup request and cause a denial of service condition on the target system.
Affected software
Cisco Secure Firewall Threat Defense (FTD)
How to mitigate CVE-2026-20290
Install updates from vendor's website.
Cisco Secure Firewall Threat Defense (FTD) - addressed in versions 7.0.10, 7.2.12, 7.4.8, 7.6.6