CVE-2026-74232: Morequick Mqac-7620

Critical severity, CVSS 9.8. EPSS: 0.8% chance of exploitation in the next 30 days.

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.

Affected products

• Morequick Mqac-7620: version 1.0.0.2.000 only
• Morequick Mqac-7620a: version 1.0.0.2.000 only
• Morequick Mqap-7620: version 1.0.0.2.000 only
• Morequick Mqap-7620a: version 1.0.0.2.000 only
• Morequick Mqap-7628: version 1.0.0.2.000 only
• Unknown AP522: version 1.0.0.2.014 only
• Unknown AP7628: version 3.0.0.4.380 only
• Unknown APG721B: version 19.0809 only
• Unknown HC5661A: version 3.0.0.4.380 only
• Unknown HK300: version 1.0.0.2.032 only
• Unknown Map-n10: version 1.0.0.2.044 only
• Zbtlink l3 v2 8: version 3.0.0.4.528 only
• Zbtlink WE826-t2: version 19.1101 only
• Zbtlink Zbt-7628: version 1.0.0.2.007 only
• Zbtlink Zbt-ZBT7621: version 1.0.0.3.001 only

Published 2026-08-27. Last modified 2026-09-24.