TerraMaster TOS - RCE (CVE-2020-28188)

CVE-2020-28188 is a critical vulnerability in TerraMaster TOS that permits unauthenticated remote command execution through improper handling of input parameters.

CrowdSec has been tracking this vulnerability and its exploits since 6th of June 2025.

CrowdSec network observations suggest that most exploitation of CVE-2020-28188 involves focused reconnaissance to identify viable targets. Attackers typically tailor their campaigns based on system exposure and configuration. It is unlikely that a given attack is accidental. CrowdSec network telemetry also shows that exploitation of CVE-2020-28188 has significantly declined over the past week. Attack volumes are well below the long-term average, suggesting attackers are rapidly losing interest. The vulnerability appears to be falling out of active use across most threat landscapes.

Observed exploitation attempts often target requests involving /include/makecvs.php or /tos/index.php?explorer/pathlist.