{"id":"CVE-2021-38399","aliases":["EUVD-2021-24851","GHSA-xh3f-3c4f-cgh5"],"status":"published","title":"Honeywell Experion PKS and ACE Controllers Relative Path Traversal","description":"Honeywell Experion PKS C200, C200E, C300, and ACE controllers are vulnerable to relative path traversal, which may allow an attacker access to unauthorized files and directories.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00927,"percentile":0.60932,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-22","CWE-23"],"published":"2022-10-28T01:19:02Z","modified":"2026-06-17T04:02:01Z","products":[{"vendor":"honeywell","product":"application_control_environment_firmware"},{"vendor":"honeywell","product":"c200_firmware"},{"vendor":"honeywell","product":"c200e_firmware"},{"vendor":"honeywell","product":"c300_firmware"},{"vendor":"honeywell","product":"experion pks"}],"references":[{"url":"https://www.cisa.gov/uscert/ics/advisories/icsa-21-278-04","tags":["x_transferred","Third Party Advisory","US Government Resource"]},{"url":"https://www.honeywellprocess.com/library/support/notifications/Customer/SN2021-02-22-01-Experion-C300-CCL.pdf","tags":["x_transferred","Product"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-38399"},{"url":"https://github.com/advisories/GHSA-xh3f-3c4f-cgh5"}],"sources":{"cve":[{"id":"CVE-2021-38399","title":"Honeywell Experion PKS and ACE Controllers Relative Path Traversal","description":"Honeywell Experion PKS C200, C200E, C300, and ACE controllers are vulnerable to relative path traversal, which may allow an attacker access to unauthorized files and directories.","status":"published","published":"2022-10-28T01:19:02.691Z","modified":"2025-04-16T16:07:59.274Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"cna"}],"cwes":["CWE-23"],"updated_at":"2026-11-02T14:33:07.697752Z"}],"euvd":[{"id":"EUVD-2021-24851","description":"Honeywell Experion PKS C200, C200E, C300, and ACE controllers are vulnerable to relative path traversal, which may allow an attacker access to unauthorized files and directories.","status":"published","published":"2022-10-28T01:19:02Z","modified":"2025-04-16T16:07:59Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-02T20:52:24.837818Z"}],"ghsa":[{"id":"GHSA-xh3f-3c4f-cgh5","title":"Honeywell Experion PKS C200, C200E, C300, and ACE controllers are vulnerable to relative path...","description":"Honeywell Experion PKS C200, C200E, C300, and ACE controllers are vulnerable to relative path traversal, which may allow an attacker access to unauthorized files and directories.","status":"published","published":"2022-10-28T12:00:34Z","modified":"2023-01-31T05:03:39Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T14:48:30.831549Z"}],"nvd":[{"id":"CVE-2021-38399","description":"Honeywell Experion PKS C200, C200E, C300, and ACE controllers are vulnerable to relative path traversal, which may allow an attacker access to unauthorized files and directories.","status":"published","published":"2022-10-28T02:15:17.04Z","modified":"2026-06-17T04:02:01.513Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"primary"}],"cwes":["CWE-23","CWE-22"],"updated_at":"2026-11-02T14:07:06.906968Z"}]}}