CVE-2025-45851

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

An issue in Hikvision DS-2CD1321-I V5.7.21 build 230819 allows attackers to cause a Denial of Service (DoS) via sending a crafted POST request to the endpoint /ISAPI/Security/challenge. The vendor has stated that upgrading to V5.7.23_SP2 fixes the issue.

Published 2025-06-27. Last modified 2026-06-17.