CVE-2026-11405

The web server binary /bin/httpd contains a hidden backdoor authentication mechanism in the login() function at 004c88b8. The function contains a normal authentication path using MD5/hash-based password verification (prod_encode64/PasswordToMd5/check_rand_key). After normal authentication fails, it calls GetValue("sys.rzadmin.password") to read a backdoor password from the device configuration. It performs a direct strcmp() comparison (plaintext, not hashed) between the config value and the user-supplied password. A successful match grants role=2 (admin-level access) and creates a valid session. The rzadmin username is never checked — any username works with the backdoor

1 article across 1 outlet · first covered Jul 7, 2026 · latest Jul 7, 2026