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9.3

Zbtlink router firmware lets attacker run commands

CVE-2026-74233 · published 7 days ago
Summary

Several Zbtlink router models and some other devices run a background service that can be tricked by an unauthenticated network packet. An attacker who can reach the device on UDP port 9992 can cause it to execute any command with full system privileges. Update the firmware to a patched version or block UDP port 9992 at your firewall until you can upgrade.

Original advisory text
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...
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.
References
Severity
9.3 Critical
CVSS 3.1: 9.8 (NVD)
CVSS 4.0: 9.3 (NVD)
Exploitation
EPSS 3%
Type
CWE-78OS Command Injection
CWE-321Use of Hard-coded Cryptographic Key
Timeline
Published27 Aug 2026
Updated2 Sep 2026
First seen27 Aug 2026
Sources
CVE-2026-74233 · NVD
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