{"id":"CVE-2017-1000420","aliases":["GHSA-28xp-g7f6-7mhf"],"url":"https://o3.security/vulnerability/CVE-2017-1000420","summary":"Syncthing vulnerable to symlink traversal and arbitrary file overwrite","details":"Syncthing version 0.14.33 and older erronously versions symlinks when they are deleted. If a directory is then created with the same name, a file created in that directory, and the file deleted, it is moved into the symlink target. This can lead to symlink traversal resulting in arbitrary file overwrite.","published":"2018-01-02T19:29:00.257Z","modified":"2026-07-08T12:05:24.882967Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},"epss":{"score":0.01509,"percentile":0.73174,"asOf":"2026-09-17"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/syncthing/syncthing","fixedVersion":null}],"fix":{"url":"https://github.com/syncthing/syncthing/commit/f1f21bf22020d9b881478c2e942ba6943c8da2f3","label":"syncthing/syncthing@f1f21bf"},"references":[{"type":"FIX","url":"https://github.com/syncthing/syncthing/issues/4286"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2017-1000420"},{"type":"WEB","url":"https://github.com/syncthing/syncthing/commit/f1f21bf22020d9b881478c2e942ba6943c8da2f3"},{"type":"PACKAGE","url":"https://github.com/syncthing/syncthing"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T12:05:24.882967Z"}}