Zbtlink MQWrt yunmgrd Cloud C2 Implant

Answer in brief

CVE-2026-74232 records a Unknown severity vulnerability in Zbtlink MQWrt yunmgrd Cloud C2 Implant. The current sources do not mark it as known exploited. The current feed maps Unknown/AP522 (generic), Unknown/AP7628 (generic), Unknown/APG721B (generic), Unknown/HC5661A (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: 15 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/AP522 (generic), Unknown/AP7628 (generic), Unknown/APG721B (generic), Unknown/HC5661A (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/AP522generic	1.0.0.2.014	Not reported
Unknown/AP7628generic	3.0.0.4.380	Not reported
Unknown/APG721Bgeneric	19.0809	Not reported
Unknown/HC5661Ageneric	3.0.0.4.380	Not reported
Unknown/HK300generic	1.0.0.2.032	Not reported
Zbtlink/L3_V2_8generic	3.0.0.4.528	Not reported
Unknown/MAP-N10generic	1.0.0.2.044	Not reported
MoreQuick/MQAC-7620generic	1.0.0.2.000	Not reported
MoreQuick/MQAC-7620Ageneric	1.0.0.2.000	Not reported
MoreQuick/MQAP-7620generic	1.0.0.2.000	Not reported
MoreQuick/MQAP-7620Ageneric	1.0.0.2.000	Not reported
MoreQuick/MQAP-7628generic	1.0.0.2.000	Not reported
Zbtlink/WE826-T2generic	19.1101	Not reported
Zbtlink/ZBT-7628generic	1.0.0.2.007	Not reported
Zbtlink/ZBT-ZBT7621generic	1.0.0.3.001	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Unknown/AP522, Unknown/AP7628, Unknown/APG721B.
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 L3_V2_8 firmware 3.0.0.4.528, Zbtlink WE826-T2 firmware 19.1101, Zbtlink ZBT-7628 firmware 1.0.0.2.007, Zbtlink ZBT-ZBT7621 firmware 1.0.0.3.001, MoreQuick MQAC-7620, MQAC-7620A, MQAP-7620, MQAP-7620A, and MQAP-7628 firmware 1.0.0.2.000, AP522 firmware 1.0.0.2.014, AP7628 and HC5661A firmware 3.0.0.4.380, APG721B firmware 19.0809, HK300 firmware 1.0.0.2.032, and MAP-N10 firmware 1.0.0.2.044 ship a backdoor command-and-control implant (yunmgrd) reachable over an unauthenticated cleartext UDP channel to a hardcoded C2 server. A remote unauthenticated attacker on the network path can hijack the channel and execute arbitrary commands as root. The attacker can also modify DNS entries, exfiltrate PPPoE credentials, and open reverse SSH tunnels.

Quoted source text, attributed separately from HOL analysis.