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Vulnerability record · CVE-2026-36738 · published 13 May 2026

CVE-2026-36738: U-speed t18-21k firmware improper access control vulnerability

UU Speed · T18 21k Firmware

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.

6.8 CVSS 3.1 Medium EPSS 0.33% · top 76.8% CWE-284 · Improper access control
6.8CVSS 3.1 base score
0.33%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References, 2 tagged exploit
30 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/N0tMilk/vulnerability-research Third Party Advisory
https://github.com/N0tMilk/vulnerability-research/tree/main/IoT/CVE-2026-36738 ExploitThird Party Advisory
https://github.com/N0tMilk/vulnerability-research/tree/main/IoT/CVE-2026-36738 ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-36738), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.