Hc5661A
Monthly
Root-level remote code execution affects a family of Zbtlink, MoreQuick, and related OEM routers/APs (e.g. L3_V2_8 3.0.0.4.528, WE826-T2 19.1101, ZBT-7628, ZBT-ZBT7621, AP522, AP7628, HC5661A, HK300, MAP-N10) that ship a factory backdoor implant named 'yunmgrd' beaconing to a hardcoded cloud C2 over unauthenticated cleartext UDP. Because the channel is unauthenticated and in cleartext, a remote attacker on the network path can hijack it, impersonate the C2, and run arbitrary commands as root - additionally tampering with DNS, stealing PPPoE credentials, and opening reverse SSH tunnels. Reported by VulnCheck with publicly available exploit code; not currently listed in CISA KEV.
Root-level remote code execution affects a family of Zbtlink, MoreQuick, and related OEM routers/APs (e.g. L3_V2_8 3.0.0.4.528, WE826-T2 19.1101, ZBT-7628, ZBT-ZBT7621, AP522, AP7628, HC5661A, HK300, MAP-N10) that ship a factory backdoor implant named 'yunmgrd' beaconing to a hardcoded cloud C2 over unauthenticated cleartext UDP. Because the channel is unauthenticated and in cleartext, a remote attacker on the network path can hijack it, impersonate the C2, and run arbitrary commands as root - additionally tampering with DNS, stealing PPPoE credentials, and opening reverse SSH tunnels. Reported by VulnCheck with publicly available exploit code; not currently listed in CISA KEV.