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TI-2026-52020 Aliases CVE-2026-74232GHSA-jgcj-chrm-4hhc

Zbtlink MQWrt yunmgrd Cloud C2 Implant

Priority HIGH 81CWE-300Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-506.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00814 57th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ZbtlinkL3_V2_83.0.0.4.528—No fix listedCNA
ZbtlinkWE826-T219.1101—No fix listedCNA
ZbtlinkZBT-76281.0.0.2.007—No fix listedCNA
ZbtlinkZBT-ZBT76211.0.0.3.001—No fix listedCNA
MoreQuickMQAC-76201.0.0.2.000—No fix listedCNA
MoreQuickMQAC-7620A1.0.0.2.000—No fix listedCNA
MoreQuickMQAP-76201.0.0.2.000—No fix listedCNA
MoreQuickMQAP-7620A1.0.0.2.000—No fix listedCNA
MoreQuickMQAP-76281.0.0.2.000—No fix listedCNA
UnknownAP5221.0.0.2.014—No fix listedCNA
UnknownAP76283.0.0.4.380—No fix listedCNA
UnknownAPG721B19.0809—No fix listedCNA
UnknownHC5661A3.0.0.4.380—No fix listedCNA
UnknownHK3001.0.0.2.032—No fix listedCNA
UnknownMAP-N101.0.0.2.044—No fix listedCNA
  • L3_V2_8 VendorZbtlink Affected 3.0.0.4.528 Fixed in — No fix listed CNA
  • WE826-T2 VendorZbtlink Affected 19.1101 Fixed in — No fix listed CNA
  • ZBT-7628 VendorZbtlink Affected 1.0.0.2.007 Fixed in — No fix listed CNA
  • ZBT-ZBT7621 VendorZbtlink Affected 1.0.0.3.001 Fixed in — No fix listed CNA
  • MQAC-7620 VendorMoreQuick Affected 1.0.0.2.000 Fixed in — No fix listed CNA
  • MQAC-7620A VendorMoreQuick Affected 1.0.0.2.000 Fixed in — No fix listed CNA
  • MQAP-7620 VendorMoreQuick Affected 1.0.0.2.000 Fixed in — No fix listed CNA
  • MQAP-7620A VendorMoreQuick Affected 1.0.0.2.000 Fixed in — No fix listed CNA
  • MQAP-7628 VendorMoreQuick Affected 1.0.0.2.000 Fixed in — No fix listed CNA
  • AP522 VendorUnknown Affected 1.0.0.2.014 Fixed in — No fix listed CNA
  • AP7628 VendorUnknown Affected 3.0.0.4.380 Fixed in — No fix listed CNA
  • APG721B VendorUnknown Affected 19.0809 Fixed in — No fix listed CNA
  • HC5661A VendorUnknown Affected 3.0.0.4.380 Fixed in — No fix listed CNA
  • HK300 VendorUnknown Affected 1.0.0.2.032 Fixed in — No fix listed CNA
  • MAP-N10 VendorUnknown Affected 1.0.0.2.044 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-74232
  2. 2026-10-03 Alias added: GHSA-jgcj-chrm-4hhc

References

—

  • TI-2026-52021 Zbtlink MQWrt infosrvd Command Injection CVSS 4.0CRITICAL 9.3
  • TI-2026-47395 ENDLESSDOORS: Zbtlink Router rctl/kworker Phone-Home Root Implant CVSS 4.0CRITICAL 9.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences