CVE-2025-28172: Grandstream UCM6510 Firmware

Medium severity, CVSS 6.5. EPSS: 0.3% chance of exploitation in the next 30 days.

Grandstream Networks UCM6510 v1.0.20.52 and before is vulnerable to Improper Restriction of Excessive Authentication Attempts. An attacker can perform an arbitrary number of authentication attempts using different passwords and eventually gain access to the targeted account using a brute force attack.

Affected products

• Grandstream UCM6510 Firmware: up to and including 1.0.20.52

Published 2025-07-29. Last modified 2026-07-05.