Paper/Archive/CVE-2026-74232

CVE-2026-74232

Zbtlink L3_V2_8 — Zbtlink MQWrt yunmgrd Cloud C2 Implant

CVSS 9.8 (CNA)9.8 / 10 × 3029.4 Not in CISA KEV+300.0 EPSS percentile 57.0.570 × 2011.4 Exploit: SSVC poc+1010.0 SSVC exploitation: poc+100.0

Description · from the CVE record

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

ProductAffectedFixed inSource

L3_V2_83.0.0.4.528–CNA

WE826-T219.1101–CNA

ZBT-76281.0.0.2.007–CNA

ZBT-ZBT76211.0.0.3.001–CNA

MQAC-76201.0.0.2.000–CNA

MQAC-7620A1.0.0.2.000–CNA

MQAP-76201.0.0.2.000–CNA

MQAP-7620A1.0.0.2.000–CNA

MQAP-76281.0.0.2.000–CNA

AP5221.0.0.2.014–CNA

AP76283.0.0.4.380–CNA

APG721B19.0809–CNA

Scores by source

VulnCheck (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

VulnCheck (CNA)9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CISA ADPSSVCExploitation: poc · Automatable: yes · Technical impact: total

References

exploitvulncheck.com/blog/zbt-darklantern-speakingstone writeupvulncheck.com/advisories/zbtlink-mqwrt-yunmgrd-cloud-c2-implant