We826 T2
Monthly
Remote unauthenticated command execution affects a broad range of Zbtlink MT7620-based routers and gateways (WE1326, WE2426-C, WE5926 family, WE826 family, WG108/WG3526, WF3526-P, CTN720-W1, LF-1541, MT7620N, WRC1) whose infosrvd service listens on UDP/9992. A single crafted UDP packet lets an attacker run arbitrary commands as root, because the service's authentication relies on a hardcoded salt and accepts an all-zero wildcard MAC, defeating the intended check. Publicly available exploit code exists (research and advisory published by VulnCheck), the CVSS 4.0 base score is 9.3, and no active exploitation has been confirmed in CISA KEV at time of analysis.
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.
Remote unauthenticated command execution affects a broad range of Zbtlink MT7620-based routers and gateways (WE1326, WE2426-C, WE5926 family, WE826 family, WG108/WG3526, WF3526-P, CTN720-W1, LF-1541, MT7620N, WRC1) whose infosrvd service listens on UDP/9992. A single crafted UDP packet lets an attacker run arbitrary commands as root, because the service's authentication relies on a hardcoded salt and accepts an all-zero wildcard MAC, defeating the intended check. Publicly available exploit code exists (research and advisory published by VulnCheck), the CVSS 4.0 base score is 9.3, and no active exploitation has been confirmed in CISA KEV at time of analysis.
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.