Zbtlink MQWrt infosrvd Command Injection

Answer in brief

CVE-2026-74233 records a Unknown severity vulnerability in Zbtlink MQWrt infosrvd Command Injection. The current sources do not mark it as known exploited. The current feed maps Unknown/CTN720-W1 (generic), Unknown/LF-1541 (generic), Unknown/MT7620N (generic), Zbtlink/WE1326 (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 27, 2026Updated Aug 27, 2026Source checked Aug 27, 2026First seen by HOL Aug 27, 2026Material review Aug 27, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 16 mapped packages or products
Fix availability: Not reported

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Unknown/CTN720-W1 (generic), Unknown/LF-1541 (generic), Unknown/MT7620N (generic), Zbtlink/WE1326 (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Unknown/CTN720-W1generic	19.1101	Not reported
Unknown/LF-1541generic	19.1101	Not reported
Unknown/MT7620Ngeneric	19.1101	Not reported
Zbtlink/WE1326generic	19.1101	Not reported
Zbtlink/WE2426-Cgeneric	19.1112	Not reported
Zbtlink/WE357generic	19.1101	Not reported
Zbtlink/WE5926generic	19.1101	Not reported
Zbtlink/WE5926-EC_QPgeneric	20.0516	Not reported
Zbtlink/WE5926-WDgeneric	19.1101	Not reported
Zbtlink/WE826-Qgeneric	19.1101	Not reported
Zbtlink/WE826-T2generic	19.1101	Not reported
Zbtlink/WE826-WDgeneric	19.1101	Not reported
Zbtlink/WF3526-Pgeneric	19.051	Not reported
Zbtlink/WG108generic	19.1101	Not reported
Zbtlink/WG3526generic	19.1101	Not reported
Unknown/WRC1generic	20.0622	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Unknown/CTN720-W1, Unknown/LF-1541, Unknown/MT7620N.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Aug 27, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 27, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 27, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.