Infinite loop in Cisco Firewall Threat Defense (FTD) - CVE-2025-20217
Published: August 15, 2025
Vulnerability identifier: #VU114108
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-20217
CWE-ID: CWE-835
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 infinite loop in the packet inspection functionality of the Snort 3 Detection Engine. A remote attacker can consume all available system resources and cause denial of service conditions.
Affected software
Cisco Firewall Threat Defense (FTD)
How to mitigate CVE-2025-20217
Install update from vendor's website.
Cisco Firewall Threat Defense (FTD) - addressed in versions 7.2.10, 7.4.2.2, 7.4.2.3, 7.6.1, 7.6.2, 7.7.0, 7.7.10