{"id":"CVE-2021-27171","aliases":["EUVD-2021-13938","GHSA-j7hh-h4p5-vc2f"],"status":"published","title":"An issue was discovered on FiberHome HG6245D devices through RP2613. It is possible to start a...","description":"An issue was discovered on FiberHome HG6245D devices through RP2613. It is possible to start a Linux telnetd as root on port 26/tcp by using the CLI interface commands of ddd and shell (or tshell).","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-12","score":0.18041,"percentile":0.97234,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-787"],"published":"2021-02-10T18:35:36Z","modified":"2026-06-17T03:44:23Z","products":[{"vendor":"fiberhome","product":"hg6245d_firmware"}],"references":[{"url":"https://pierrekim.github.io/blog/2021-01-12-fiberhome-ont-0day-vulnerabilities.html#telnet-cli-privilege-escalation","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-27171"},{"url":"https://github.com/advisories/GHSA-j7hh-h4p5-vc2f"}],"sources":{"cve":[{"id":"CVE-2021-27171","description":"An issue was discovered on FiberHome HG6245D devices through RP2613. It is possible to start a Linux telnetd as root on port 26/tcp by using the CLI interface commands of ddd and shell (or tshell).","status":"published","published":"2021-02-10T18:35:36Z","modified":"2024-08-03T20:40:47.476Z","updated_at":"2026-11-02T14:33:04.360272Z"}],"euvd":[{"id":"EUVD-2021-13938","description":"An issue was discovered on FiberHome HG6245D devices through RP2613. It is possible to start a Linux telnetd as root on port 26/tcp by using the CLI interface commands of ddd and shell (or tshell).","status":"published","published":"2021-02-10T18:35:36Z","modified":"2024-08-03T20:40:47Z","updated_at":"2026-11-03T03:24:49.808499Z"}],"ghsa":[{"id":"GHSA-j7hh-h4p5-vc2f","title":"An issue was discovered on FiberHome HG6245D devices through RP2613. It is possible to start a...","description":"An issue was discovered on FiberHome HG6245D devices through RP2613. It is possible to start a Linux telnetd as root on port 26/tcp by using the CLI interface commands of ddd and shell (or tshell).","status":"published","published":"2022-05-24T17:41:51Z","modified":"2023-01-29T05:05:40Z","cwes":["CWE-787"],"updated_at":"2026-11-02T14:45:50.827495Z"}],"nvd":[{"id":"CVE-2021-27171","description":"An issue was discovered on FiberHome HG6245D devices through RP2613. It is possible to start a Linux telnetd as root on port 26/tcp by using the CLI interface commands of ddd and shell (or tshell).","status":"published","published":"2021-02-10T19:15:15.057Z","modified":"2026-06-17T03:44:23.877Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":10,"vector":"AV:N/AC:L/Au:N/C:C/I:C/A:C","level":"high","assessor":"primary"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:06:50.031227Z"}]}}