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CVE-2026-74232: Multiple Zbtlink and MoreQuick devices allow remote code execution

CVE-2026-74232 · published 7 days ago

Summary

Several firmware versions for Zbtlink, MoreQuick, AP, HK and MAP devices contain code that opens an unauthenticated UDP channel to a fixed server. Anyone on the same network can take control, run commands as the system’s administrator, change DNS settings, steal PPPoE passwords and create hidden SSH tunnels. Apply the latest firmware updates from the vendor and block or monitor unexpected UDP traffic to unknown external addresses.

Original advisory text

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.

References

Severity

9.3 Critical

CVSS 3.1: 9.8 (NVD)

CVSS 4.0: 9.3 (NVD)

Exploitation

EPSS <1%

Type

CWE-300Channel Accessible by Non-Endpoint

CWE-506Embedded Malicious Code

Timeline

Published27 Aug 2026

Updated3 Sep 2026

First seen27 Aug 2026

Sources

CVE-2026-74232 · NVD

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