{"id":"CVE-2021-27173","aliases":["EUVD-2021-13940","GHSA-vr73-2fhc-cc9m"],"status":"published","title":"An issue was discovered on FiberHome HG6245D devices through RP2613. There is a telnet?enable=0...","description":"An issue was discovered on FiberHome HG6245D devices through RP2613. There is a telnet?enable=0\u0026key=calculated(BR0_MAC) backdoor API, without authentication, provided by the HTTP server. This will remove firewall rules and allow an attacker to reach the telnet server (used for the CLI).","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.12823,"percentile":0.96341,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-287"],"published":"2021-02-10T18:35:09Z","modified":"2026-06-17T03:44:24Z","products":[{"vendor":"fiberhome","product":"hg6245d_firmware"}],"references":[{"url":"https://pierrekim.github.io/blog/2021-01-12-fiberhome-ont-0day-vulnerabilities.html#httpd-infoleak","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-27173"},{"url":"https://github.com/advisories/GHSA-vr73-2fhc-cc9m"}],"sources":{"cve":[{"id":"CVE-2021-27173","description":"An issue was discovered on FiberHome HG6245D devices through RP2613. There is a telnet?enable=0\u0026key=calculated(BR0_MAC) backdoor API, without authentication, provided by the HTTP server. This will remove firewall rules and allow an attacker to reach the telnet server (used for the CLI).","status":"published","published":"2021-02-10T18:35:09Z","modified":"2024-08-03T20:40:47.401Z","updated_at":"2026-11-02T14:33:04.360272Z"}],"euvd":[{"id":"EUVD-2021-13940","description":"An issue was discovered on FiberHome HG6245D devices through RP2613. There is a telnet?enable=0\u0026key=calculated(BR0_MAC) backdoor API, without authentication, provided by the HTTP server. This will remove firewall rules and allow an attacker to reach the telnet server (used for the CLI).","status":"published","published":"2021-02-10T18:35:09Z","modified":"2024-08-03T20:40:47Z","updated_at":"2026-11-03T03:24:49.808499Z"}],"ghsa":[{"id":"GHSA-vr73-2fhc-cc9m","title":"An issue was discovered on FiberHome HG6245D devices through RP2613. There is a telnet?enable=0...","description":"An issue was discovered on FiberHome HG6245D devices through RP2613. There is a telnet?enable=0\u0026key=calculated(BR0_MAC) backdoor API, without authentication, provided by the HTTP server. This will remove firewall rules and allow an attacker to reach the telnet server (used for the CLI).","status":"published","published":"2022-05-24T17:41:51Z","modified":"2023-01-27T05:03:01Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T14:42:09.126228Z"}],"nvd":[{"id":"CVE-2021-27173","description":"An issue was discovered on FiberHome HG6245D devices through RP2613. There is a telnet?enable=0\u0026key=calculated(BR0_MAC) backdoor API, without authentication, provided by the HTTP server. This will remove firewall rules and allow an attacker to reach the telnet server (used for the CLI).","status":"published","published":"2021-02-10T19:15:15.183Z","modified":"2026-06-17T03:44:24.113Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:P/A:N","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:06:50.031227Z"}]}}