CVE-2020-5726 (ucm6202_firmware, ucm6204_firmware, ucm6208_firmware)
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.
Source: CVE-2020-5726 (ucm6202_firmware, ucm6204_firmware, ucm6208_firmware)