CVE-2026-74232: Zbtlink MQWrt yunmgrd Cloud C2 Implant
Zbtlink L3V28 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.
Affected Software
Event History
Frequently Asked Questions
Does exploitation require authentication or a local foothold?
No. The implant is reachable through an unauthenticated cleartext UDP channel, and the attacker only needs to be on the network path in order to hijack that channel.
Is a special feature configuration required for exposure?
The listed firmware versions are stated to ship with the yunmgrd implant. No additional configuration prerequisite, disablement option, or mitigation is provided in the available data.