Description
Tinycontrol devices such as tcPDU and LAN Controllers LK3.5, LK3.9 and LK4 have two separate authentication mechanisms - one solely for interface management and one for protecting all other server resources. When the latter is turned off (which is a default setting), an unauthenticated attacker on the local network can obtain usernames and encoded passwords for interface management portal by inspecting the HTTP response of the server when visiting the login page, which contains a JSON file with these details. Both normal and admin users credentials are exposed. This issue has been fixed in firmware versions: 1.36 (for tcPDU), 1.67 (for LK3.5 - hardware versions: 3.5, 3.6, 3.7 and 3.8), 1.75 (for LK3.9 - hardware version 3.9) and 1.38 (for LK4 - hardware version 4.0).
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
tinycontrol Lan Kontroler v3.5
Default version status: unaffected
0 to < 1.67affected
tinycontrol LK3.9
Default version status: unaffected
0 to < 1.75affected
tinycontrol LK4
Default version status: unaffected
0 to < 1.38affected
tinycontrol tcPDU
Default version status: unaffected
0 to < 1.36affected
References
- https://cert.pl/en/posts/2026/03/CVE-2025-11500/ ↗
- https://securitum.com/CVE-2025-11500 ↗
- https://tinycontrol.pl/en/archives/lan-controller-35/downloads/#firmware ↗
- https://tinycontrol.pl/en/lk39/downloads/#firmware ↗
- https://tinycontrol.pl/en/lk4/downloads/#firmware ↗
- https://tinycontrol.pl/en/tcpdu/downloads/#firmware ↗