Vulnerability in U-Speed T18-21k
CVE-2026-36738
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.003 (23.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 23rd percentile — 23.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000
Affected products
- U-Speed T18-21k
- U-Speed T18-21k Firmware — versions 1.0
Weakness classification (CWE)
References
- github.com/N0tMilk/vulnerability-research (Third Party Advisory)
- github.com/N0tMilk/vulnerability-research/tree/main/IoT/CVE-2026-36738 (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2026-36738?
- CVE-2026-36738 is a medium-severity vulnerability in U-Speed T18-21k, classified under Improper Access Control. CVSS score: 6.8/10. Published 2026-05-13.
- How severe is CVE-2026-36738?
- Medium severity. CVSS v3 base score is 6.8 out of 10.