CVE-2026-36738: U-Speed t18-21k Firmware

Medium severity, CVSS 6.8. EPSS: 0.3% chance of exploitation in the next 30 days.

U-SPEED AC1200 Gigabit Wi-Fi Router (Model: T18-21K) V1.0 is vulnerable to Incorrect Access Control. The device exposes a UART interface that lacks authentication, authorization, or access control mechanisms. An attacker with physical access to the UART pins can connect to the interface and gain unrestricted access to device functionality.

Affected products

• U-Speed t18-21k Firmware: version 1.0 only

Published 2026-05-13. Last modified 2026-06-30.