CVE-2024-0840: Grandstream UCM6202 Firmware

High severity, CVSS 8.8. EPSS: 0.9% chance of exploitation in the next 30 days.

The Grandstream UCM Series IP PBX before firmware version 1.0.20.52 is affected by a parameter injection vulnerability in the HTTP interface. A remote and authenticated attacker can execute arbitrary code by sending a crafted HTTP request. Authentication may be possible using a default user and password. Affected models are the UCM6202, UCM6204, UCM6208, and UCM6510.

Affected products

• Grandstream UCM6202 Firmware: before 1.0.20.52 (fixed in 1.0.20.52)
• Grandstream UCM6204 Firmware: before 1.0.20.52 (fixed in 1.0.20.52)
• Grandstream UCM6208 Firmware: before 1.0.20.52 (fixed in 1.0.20.52)
• Grandstream UCM6510 Firmware: before 1.0.20.52 (fixed in 1.0.20.52)
• Grandstream Ucm Series: before 1.0.20.52 (fixed in 1.0.20.52)

Published 2024-04-29. Last modified 2026-06-17.