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CVE-2026-74232— Zbtlink MQWrt yunmgrd Cloud C2 Implant

Quick assessment

Affected
Zbtlink L3_V2_8
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Zbtlink L3_V2_8 固件 3.0.0.4.528、Zbtlink WE826-T2 固件 19.1101、Zbtlink ZBT-7628 固件 1.0.0.2.007、Zbtlink ZBT-ZBT7621 固件 1.0.0.3.001、MoreQuick MQAC-7620、MQAC-7620A、MQAP-7620、MQAP-7620A 和 MQAP-7628 固件 1.0.0.2.000、AP522 固件 1.0.0.2.014、AP7628 和 HC5661A 固件 3.0.0.4.380、AP

CVSS 9.8 · Critical
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I. Basic Information for CVE-2026-74232

Vulnerability Information
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Vulnerability Title
Zbtlink MQWrt yunmgrd Cloud C2 Implant
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
内嵌的恶意代码
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
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 -

II. Public POCs for CVE-2026-74232

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III. Intelligence Information for CVE-2026-74232

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Other References for CVE-2026-74232 (1)

IV. Related Vulnerabilities

Same vendor: Zbtlink
Same weakness: CWE-506

V. Comments for CVE-2026-74232

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