Vulnerability in Morequick Mqac-7620
CVE-2026-74232
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.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Morequick Mqac-7620 — versions 1.0.0.2.000
- Morequick Mqac-7620a — versions 1.0.0.2.000
- Morequick Mqap-7620 — versions 1.0.0.2.000
- Morequick Mqap-7620a — versions 1.0.0.2.000
- Morequick Mqap-7628 — versions 1.0.0.2.000
- Zbtlink L3_v2_8 — versions 3.0.0.4.528
- Zbtlink Zbt-7628 — versions 1.0.0.2.007
- Zbtlink Zbt-zbt7621 — versions 1.0.0.3.001
- Unknown Ap522 — versions 1.0.0.2.014
- Unknown Ap7628 — versions 3.0.0.4.380
Weakness classification (CWE)
References
- disclosure@vulncheck.com (technical-description, exploit)
- disclosure@vulncheck.com (third-party-advisory)
Frequently asked questions
- What is CVE-2026-74232?
- CVE-2026-74232 is a critical-severity vulnerability in Morequick Mqac-7620, classified under Channel Accessible by Non-Endpoint. CVSS score: 9.8/10. Published 2026-08-27.
- How severe is CVE-2026-74232?
- Critical severity. CVSS v3 base score is 9.8 out of 10.