{"id":"CVE-2026-11405","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-11405","summary":"The web server binary /bin/httpd contains a hidden backdoor authentication mechanism in the login() function at 004c88b8.\r\n\r\n- The function contains a normal authentication path using…","details":"The web server binary /bin/httpd contains a hidden backdoor authentication mechanism in the login() function at 004c88b8.\r\n\r\n- The function contains a normal authentication path using MD5/hash-based password verification (prod_encode64/PasswordToMd5/check_rand_key).\r\n- After normal authentication fails, it calls GetValue(\"sys.rzadmin.password\") to read a backdoor password from the device configuration.\r\n- It performs a direct strcmp() comparison (plaintext, not hashed) between the config value and the user-supplied password.\r\n\r\nA 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","published":"2026-07-06T20:16:29.450","modified":"2026-07-08T14:16:54.773","cvss":{"score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":{"score":0.01616,"percentile":0.74099,"asOf":"2026-08-20"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[],"fix":null,"references":[{"type":"WEB","url":"https://cwe.mitre.org/data/definitions/912.html"},{"type":"WEB","url":"https://kb.cert.org/vuls/id/213560"},{"type":"WEB","url":"https://www.kb.cert.org/vuls/id/213560"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T14:16:54.773"}}