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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是Zbtlink公司的一款三层交换机。 Zbtlink L3_V2_8 3.0.0.4.528版本、Zbtlink WE826-T2 19.1101版本、Zbtlink ZBT-7628 1.0.0.2.007版本、Zbtlink ZBT-ZBT7621 1.0.0.3.001版本、MoreQuick MQAC-7620 1.0.0.2.000版本、MoreQuick MQAC-7620A 1.0.0.2.000版本、MoreQuick MQAP-7620 1.0.0.2.0

CVSS 9.8 · Critical EPSS 0.81% · P56

Affected Version Matrix 15

VendorProduct Version RangeStatus
MoreQuick MQAC-7620 1.0.0.2.000 affected
MoreQuick MQAC-7620A 1.0.0.2.000 affected
MoreQuick MQAP-7620 1.0.0.2.000 affected
MoreQuick MQAP-7620A 1.0.0.2.000 affected
MoreQuick MQAP-7628 1.0.0.2.000 affected
Unknown AP522 1.0.0.2.014 affected
Unknown AP7628 3.0.0.4.380 affected
Unknown APG721B 19.0809 affected
Unknown HC5661A 3.0.0.4.380 affected
Unknown HK300 1.0.0.2.032 affected
Unknown MAP-N10 1.0.0.2.044 affected
Zbtlink L3_V2_8 3.0.0.4.528 affected
Zbtlink WE826-T2 19.1101 affected
Zbtlink ZBT-7628 1.0.0.2.007 affected
Zbtlink ZBT-ZBT7621 1.0.0.3.001 affected
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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
Vulnerability Title
Zbtlink L3_V2_8 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Zbtlink L3_V2_8是Zbtlink公司的一款三层交换机。 Zbtlink L3_V2_8 3.0.0.4.528版本、Zbtlink WE826-T2 19.1101版本、Zbtlink ZBT-7628 1.0.0.2.007版本、Zbtlink ZBT-ZBT7621 1.0.0.3.001版本、MoreQuick MQAC-7620 1.0.0.2.000版本、MoreQuick MQAC-7620A 1.0.0.2.000版本、MoreQuick MQAP-7620 1.0.0.2.0
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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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