CVE-2025-28171 is a vulnerability affecting Grandstream UCM6510 devices running firmware version 1.0.20.52 and earlier. The flaw allows a remote attacker to gain access to sensitive information through the Login function exposed at the /cgi and /webrtccgi endpoints. The vulnerability is categorized under CWE-922, indicating improper restriction of operations within the bounds of a memory buffer or similar resource. The CVSS 3.1 base score is 6.5, reflecting a medium severity with network attack vector, low attack complexity, no privileges required, and no user interaction needed. There is no indication of known exploits in the wild or an available patch at this time.

Successful exploitation can lead to unauthorized disclosure of sensitive information from the affected Grandstream UCM6510 devices. The impact is limited to confidentiality and integrity, with no reported impact on availability. The vulnerability can be exploited remotely without authentication or user interaction.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict network access to the affected endpoints and monitor for suspicious activity related to the /cgi and /webrtccgi login functions. Avoid exposing the device management interfaces to untrusted networks.