Vulnerability Intelligence Report
Zbtlink MQWrt infosrvd Command Injection
CVE-2026-74233
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.
Injection
No Active Exploit Signals
CVSS Base Score
9.3
CRITICAL
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Zbtlink | WE1326 | 19.1101 (affected) |
| Zbtlink | WE2426-C | 19.1112 (affected) |
| Zbtlink | WE357 | 19.1101 (affected) |
| Zbtlink | WE5926 | 19.1101 (affected) |
| Zbtlink | WE5926-EC_QP | 20.0516 (affected) |
| Zbtlink | WE5926-WD | 19.1101 (affected) |
| Zbtlink | WE826-Q | 19.1101 (affected) |
| Zbtlink | WE826-T2 | 19.1101 (affected) |
| Zbtlink | WE826-WD | 19.1101 (affected) |
| Zbtlink | WF3526-P | 19.051 (affected) |
| Zbtlink | WG108 | 19.1101 (affected) |
| Zbtlink | WG3526 | 19.1101 (affected) |
| Unknown | CTN720-W1 | 19.1101 (affected) |
| Unknown | LF-1541 | 19.1101 (affected) |
| Unknown | MT7620N | 19.1101 (affected) |
| Unknown | WRC1 | 20.0622 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
GitHub Advisory
Vulnerability Class
Injection
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | VulnCheck · Bug Bounty Provider · USA |
| Reserved | 2026-08-14T18:01:19 |
| Published | 2026-08-27T10:40:11 |
| Patch Date | 2026-08-27 |
| Last Updated | 2026-08-27T13:41:32 |
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