Vulnerability · Published Aug 27, 2026 · Assigned by VulnCheck
CVE-2026-74232Zbtlink MQWrt yunmgrd Cloud C2 Implant
Critical 9.8
In plain English
A critical-severity security flaw in MQAC-7620 from MoreQuick. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 57% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Zbtlink | L3_V2_8 | 3.0.0.4.528 |
| Zbtlink | WE826-T2 | 19.1101 |
| Zbtlink | ZBT-7628 | 1.0.0.2.007 |
| Zbtlink | ZBT-ZBT7621 | 1.0.0.3.001 |
| MoreQuick | MQAC-7620 | 1.0.0.2.000 |
| MoreQuick | MQAC-7620A | 1.0.0.2.000 |
| MoreQuick | MQAP-7620 | 1.0.0.2.000 |
| MoreQuick | MQAP-7620A | 1.0.0.2.000 |
| MoreQuick | MQAP-7628 | 1.0.0.2.000 |
| Unknown | AP522 | 1.0.0.2.014 |
| Unknown | AP7628 | 3.0.0.4.380 |
| Unknown | APG721B | 19.0809 |
| Unknown | HC5661A | 3.0.0.4.380 |
| Unknown | HK300 | 1.0.0.2.032 |
| Unknown | MAP-N10 | 1.0.0.2.044 |
Weakness: CWE-506, CWE-300 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- VulnCheck Blog technical-description, exploit
- https://www.vulncheck.com/advisories/zbtlink-mqwrt-yunmgrd-cloud-c2-implant third-party-advisory