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CVE-2026-11405 is an undocumented authentication backdoor in multiple Tenda router firmware versions. The flaw is in the /bin/httpd web server binary, specifically the login() function at 0x004c88b8. The normal authentication path performs MD5/hash-based password verification via routines including prod_encode64, PasswordToMd5, and check_rand_key. If normal authentication fails, the code follows a hidden alternate path that calls GetValue("sys.rzadmin.password") to retrieve a password from device configuration and then compares that value directly against the user-supplied password using strcmp(). If the comparison succeeds, the code assigns role=2 and creates a valid administrator session. The associated rzadmin username is not validated in this path, so any username can be used with the backdoor password. This bypasses the configured administrator credential system and exposes the device web management interface to unauthorized administrative access.
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38 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An undocumented authentication backdoor in Tenda router firmware that bypasses normal login and grants full administrative access to the web management interface.
An undocumented authentication backdoor in multiple Tenda router firmware versions that allows attackers to bypass normal login checks and gain full administrative access to the web management interface using a hidden password.
A critical authentication backdoor in Tenda router firmware's /bin/httpd login() function that allows full administrative access without valid credentials by accepting a hidden secondary password and not validating the username in the fallback path.
A critical authentication backdoor vulnerability in Tenda router firmware's /bin/httpd login() function that allows full administrative access without valid credentials by using an undocumented fallback password check.
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Cross-references every affected SKU, including bundled OEM variants.
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