CVE-2020-5726: Grandstream UCM6202 Firmware

High severity, CVSS 7.5. EPSS: 4.3% chance of exploitation in the next 30 days.

The Grandstream UCM6200 series before 1.0.20.22 is vulnerable to an SQL injection via the CTI server on port 8888. A remote unauthenticated attacker can invoke the challenge action with a crafted username and discover user passwords.

Affected products

• Grandstream UCM6202 Firmware: before 1.0.20.22 (fixed in 1.0.20.22)
• Grandstream UCM6204 Firmware: before 1.0.20.22 (fixed in 1.0.20.22)
• Grandstream UCM6208 Firmware: before 1.0.20.22 (fixed in 1.0.20.22)

Published 2020-03-30. Last modified 2026-06-17.