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Vulnerability · Published Aug 27, 2026 · Assigned by VulnCheck

CVE-2026-74233Zbtlink MQWrt infosrvd Command Injection

Critical 9.8

In plain English

A critical-severity OS command injection in CTN720-W1 from Unknown. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 3.4% (higher than 89% of all known vulnerabilities).

Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)3.4%top 11.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

Zbtlink WE1326, WE357, WE5926, WE5926-WD, WE826-Q, WE826-T2, WE826-WD, WG108, and WG3526 firmware 19.1101, Zbtlink WE2426-C firmware 19.1112, Zbtlink WE5926-EC_QP firmware 20.0516, Zbtlink WF3526-P firmware 19.051, CTN720-W1, LF-1541, and MT7620N firmware 19.1101, and WRC1 firmware 20.0622 contain an unauthenticated command injection in the infosrvd service (UDP/9992). A remote unauthenticated attacker can send a crafted UDP packet to execute arbitrary commands as root. The service's authentication uses a hardcoded salt and an all-zero wildcard MAC bypass, rendering it ineffective.

Affected products (as reported)

VendorProductVersions
Zbtlink WE1326 19.1101
Zbtlink WE2426-C 19.1112
Zbtlink WE357 19.1101
Zbtlink WE5926 19.1101
Zbtlink WE5926-EC_QP 20.0516
Zbtlink WE5926-WD 19.1101
Zbtlink WE826-Q 19.1101
Zbtlink WE826-T2 19.1101
Zbtlink WE826-WD 19.1101
Zbtlink WF3526-P 19.051
Zbtlink WG108 19.1101
Zbtlink WG3526 19.1101
Unknown CTN720-W1 19.1101
Unknown LF-1541 19.1101
Unknown MT7620N 19.1101
Unknown WRC1 20.0622

Weakness: CWE-321, CWE-78 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References