Zbtlink MQWrt yunmgrd Cloud C2 Implant

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74232
StatePUBLISHED
AssignerVulnCheck
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-27 13:18:33 UTC
Updated2026-08-27 17:19:51 UTC
DescriptionZbtlink 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.

Risk And Classification

Primary CVSS: v4.0 9.3 CRITICAL from [email protected]

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Problem Types: CWE-300 | CWE-506 | CWE-506 Embedded Malicious Code | CWE-300 Channel Accessible by Non-Endpoint

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary9.3CRITICALCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/C...
4.0CNACVSS9.3CRITICALCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
3.1[email protected]Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNACVSS9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Confidentiality
High
Integrity
High
Availability
High
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Zbtlink L3 V2 8 affected 3.0.0.4.528 custom Not specified
CNA Zbtlink WE826-T2 affected 19.1101 custom Not specified
CNA Zbtlink ZBT-7628 affected 1.0.0.2.007 custom Not specified
CNA Zbtlink ZBT-ZBT7621 affected 1.0.0.3.001 custom Not specified
CNA MoreQuick MQAC-7620 affected 1.0.0.2.000 custom Not specified
CNA MoreQuick MQAC-7620A affected 1.0.0.2.000 custom Not specified
CNA MoreQuick MQAP-7620 affected 1.0.0.2.000 custom Not specified
CNA MoreQuick MQAP-7620A affected 1.0.0.2.000 custom Not specified
CNA MoreQuick MQAP-7628 affected 1.0.0.2.000 custom Not specified
CNA Unknown AP522 affected 1.0.0.2.014 custom Not specified
CNA Unknown AP7628 affected 3.0.0.4.380 custom Not specified
CNA Unknown APG721B affected 19.0809 custom Not specified
CNA Unknown HC5661A affected 3.0.0.4.380 custom Not specified
CNA Unknown HK300 affected 1.0.0.2.032 custom Not specified
CNA Unknown MAP-N10 affected 1.0.0.2.044 custom Not specified

References

ReferenceSourceLinkTags
www.vulncheck.com/advisories/zbtlink-mqwrt-yunmgrd-cloud-c2-implant [email protected] www.vulncheck.com
vulncheck.com/blog/zbt-darklantern-speakingstone [email protected] vulncheck.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Jacob Baines of VulnCheck (en)

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