What is CVE-2025-20217?

CVE-2025-20217 is a high-severity vulnerability in Cisco Firepower Threat Defense Software, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 8.6/10. Published 2025-08-14.

How severe is CVE-2025-20217?

High severity. CVSS v3 base score is 8.6 out of 10.

Vulnerability in Cisco Firepower Threat Defense Software

CVE-2025-20217

A vulnerability in the packet inspection functionality of the Snort 3 Detection Engine of Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on a…

EPSS: 0.001 (20.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H.

Affected products

Cisco Firepower Threat Defense Software — versions 7.1.0, 7.1.0.1, 7.2.0

Weakness classification (CWE)

CWE-835 — Loop with Unreachable Exit Condition (Infinite Loop)

References

cisco-sa-ftd-dos-SvKhtjgt

Frequently asked questions

What is CVE-2025-20217?: CVE-2025-20217 is a high-severity vulnerability in Cisco Firepower Threat Defense Software, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 8.6/10. Published 2025-08-14.
How severe is CVE-2025-20217?: High severity. CVSS v3 base score is 8.6 out of 10.