
Sending a single UDP packet executes root commands on Zbtlink routers. CVE-2026-74233 — Command injection in infosrvd (UDP/9992). Auth is bypassed via a hardcoded salt and wildcard MAC. Details: https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-74233
Post summary
This post announces CVE-2026-74233, a command injection vulnerability in Zbtlink routers’ infosrvd service that allows root command execution via a single UDP packet, detailing the authentication bypass mechanism.



