PoC Index

CVE-2026-11405

CRITICAL 9.8EPSS 0.8%

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

CVSS v3.1
9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
0.77% chance of exploitation in the next 30 days, 53th percentile
Published
2026-07-06
Updated
2026-07-08

Proof-of-concept exploits (2)

References

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