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cve recordcritical

CVE-2026-11405

Published
CVSS9.8
Severitycritical
Weakness—
ExploitedNot in CISA KEV

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Description

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

References

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Our coverage of CVE-2026-11405

CVE-2026-11405critical

Tenda Firmware Vulnerability Allows Unauthenticated Admin Access

A critical backdoor vulnerability has been discovered in Tenda device firmware, identified as CVE-2026-11405. This flaw enables unauthenticated attackers to gain administrative control over affected devices by accessing their web management interface. The vulnerability remains unpatched, posing a significant risk to users.

CVE-2026-11405high

CERT/CC Warns of Hidden Admin Backdoor in Tenda Router Firmware

CERT/CC has identified a hidden backdoor in multiple Tenda router firmware versions. This backdoor allows unauthorized administrative access to the devices' web interfaces.