TI-2026-27882 Aliases CVE-2026-36738 GHSA-hxf8-x6wv-3579

U-SPEED AC1200 Gigabit Wi-Fi Router (Model: T18-21K) V1.0 is vulnerable to Incorrect…

HIGH 65CWE-284Published 2026-05-13 · Updated 2026-05-14

Key facts

Attack vector: Physical
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-284.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00299 22nd percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPE	Versions	Role	Vendor
cpe:2.3:o:u-speed:t18-21k_firmware:1.0:::::::*	1.0	Vulnerable	U-speed
cpe:2.3:h:u-speed:t18-21k:-:::::::*	not specified by NVD	Running on	U-speed

cpe:2.3:o:u-speed:t18-21k_firmware:1.0:*:*:*:*:*:*:* Versions 1.0 Vulnerable ·U-speed
cpe:2.3:h:u-speed:t18-21k:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·U-speed

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2026-36738
2026-10-03 Alias added: GHSA-hxf8-x6wv-3579

References

Exploit 1

https://github.com/N0tMilk/vulnerability-research/tree/main/IoT/CVE-2026-36738

Advisory 1

https://github.com/N0tMilk/vulnerability-research

TI-2026-27883 U-SPEED AC1200 Gigabit Wi-Fi Router (Model: T18-21K) V1.0 is vulnerable to Command… CVSS 3.1HIGH 7.2

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences