CVE-2026-74233: Unknown CTN720-w1

Critical severity, CVSS 9.8. EPSS: 3.4% chance of exploitation in the next 30 days.

Zbtlink WE1326, WE357, WE5926, WE5926-WD, WE826-Q, WE826-T2, WE826-WD, WG108, and WG3526 firmware 19.1101, Zbtlink WE2426-C firmware 19.1112, Zbtlink WE5926-EC_QP firmware 20.0516, Zbtlink WF3526-P firmware 19.051, CTN720-W1, LF-1541, and MT7620N firmware 19.1101, and WRC1 firmware 20.0622 contain an unauthenticated command injection in the infosrvd service (UDP/9992). A remote unauthenticated attacker can send a crafted UDP packet to execute arbitrary commands as root. The service's authentication uses a hardcoded salt and an all-zero wildcard MAC bypass, rendering it ineffective.

Affected products

• Unknown CTN720-w1: version 19.1101 only
• Unknown Lf-1541: version 19.1101 only
• Unknown MT7620N: version 19.1101 only
• Unknown WRC1: version 20.0622 only
• Zbtlink WE1326: version 19.1101 only
• Zbtlink WE2426-C: version 19.1112 only
• Zbtlink WE357: version 19.1101 only
• Zbtlink WE5926: version 19.1101 only
• Zbtlink WE5926-Ec Qp: version 20.0516 only
• Zbtlink WE5926-Wd: version 19.1101 only
• Zbtlink WE826-Q: version 19.1101 only
• Zbtlink WE826-t2: version 19.1101 only
• Zbtlink WE826-Wd: version 19.1101 only
• Zbtlink WF3526-P: version 19.051 only
• Zbtlink WG108: version 19.1101 only
• Zbtlink WG3526: version 19.1101 only

Published 2026-08-27. Last modified 2026-09-24.