PT-2026-40705 · U Speed · T18-21K Firmware

Donald Warren · CVE-2026-36738 · Published 2026-05-13 · Updated 2026-06-30

Positive Technologies (AI Summary)

CVSS v3.1

6.8

Medium

Base vector

AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions U-SPEED AC1200 Gigabit Wi-Fi Router (Model: T18-21K) version 1.0

Description The device is subject to incorrect access control because it exposes a UART (Universal Asynchronous Receiver-Transmitter, a hardware communication protocol) interface that lacks authentication, authorization, or access control mechanisms. An attacker with physical access to the UART pins can connect to this interface to gain unrestricted access to device functionality.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Improper Access Control

Weakness Enumeration

CWE-284

Related Identifiers

CVE-2026-36738

Affected Products

T18-21K Firmware

References · 4

• 🔥 https://github.com/N0tMilk/vulnerability-research/tree/main/IoT/CVE-2026-36738 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-36738 · Security Note
• https://t.me/cveNotify/181422 · Telegram Post
• https://github.com/N0tMilk/vulnerability-research · Note