CVE-2025-11500: Credentials exposure in tinycontrol devices

Severity: high (CVSS 8.7 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-03-16 · updated 2026-06-17
Weakness: CWE-201

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

tinycontrol Lan Kontroler v3.5: before 1.67 — fixed in 1.67
tinycontrol LK3.9: before 1.75 — fixed in 1.75
tinycontrol LK4: before 1.38 — fixed in 1.38
tinycontrol tcPDU: before 1.36 — fixed in 1.36

How to fix

Upgrade to a fixed version: tinycontrol Lan Kontroler v3.5 1.67; tinycontrol LK3.9 1.75; tinycontrol LK4 1.38; tinycontrol tcPDU 1.36. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2025-11500 or the next vulnerability affects your stack