{"id":"CVE-2021-27662","aliases":["EUVD-2021-14408","GHSA-fv2j-64xc-r4hr"],"status":"published","title":"KT-1 Capture-replay","description":"The KT-1 door controller is susceptible to replay or man-in-the-middle attacks where an attacker can record and replay TCP packets. This issue affects Johnson Controls KT-1 all versions up to and including 3.01","severity":{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00841,"percentile":0.58378,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-294"],"published":"2021-09-15T12:04:22Z","modified":"2026-06-17T03:45:19Z","products":[{"vendor":"johnson controls","product":"kt-1"},{"vendor":"johnsoncontrols","product":"kantech_kt-1_door_controller_firmware"}],"references":[{"url":"https://www.johnsoncontrols.com/cyber-solutions/security-advisories","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory"]},{"url":"https://us-cert.gov/ics/advisories","tags":["third-party-advisory","x_refsource_CERT","x_transferred","Third Party Advisory","US Government Resource"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-27662"},{"url":"https://github.com/advisories/GHSA-fv2j-64xc-r4hr"}],"sources":{"cve":[{"id":"CVE-2021-27662","title":"KT-1 Capture-replay","description":"The KT-1 door controller is susceptible to replay or man-in-the-middle attacks where an attacker can record and replay TCP packets. This issue affects Johnson Controls KT-1 all versions up to and including 3.01","status":"published","published":"2021-09-15T12:04:22.918Z","modified":"2024-09-17T00:31:51.342Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L","level":"high","assessor":"cna"}],"cwes":["CWE-294"],"updated_at":"2026-11-02T14:33:04.360272Z"}],"euvd":[{"id":"EUVD-2021-14408","description":"The KT-1 door controller is susceptible to replay or man-in-the-middle attacks where an attacker can record and replay TCP packets. This issue affects Johnson Controls KT-1 all versions up to and including 3.01","status":"published","published":"2021-09-15T12:04:22Z","modified":"2024-09-17T00:31:51Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L","level":"high"}],"updated_at":"2026-11-03T00:28:57.917597Z"}],"ghsa":[{"id":"GHSA-fv2j-64xc-r4hr","title":"The KT-1 door controller is susceptible to replay or man-in-the-middle attacks where an attacker...","description":"The KT-1 door controller is susceptible to replay or man-in-the-middle attacks where an attacker can record and replay TCP packets. This issue affects Johnson Controls KT-1 all versions up to and including 3.01","status":"published","published":"2022-05-24T19:14:40Z","modified":"2023-01-30T05:02:14Z","cwes":["CWE-294"],"updated_at":"2026-11-02T14:46:35.666418Z"}],"nvd":[{"id":"CVE-2021-27662","description":"The KT-1 door controller is susceptible to replay or man-in-the-middle attacks where an attacker can record and replay TCP packets. This issue affects Johnson Controls KT-1 all versions up to and including 3.01","status":"published","published":"2021-09-15T13:15:07.8Z","modified":"2026-06-17T03:45:19.053Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L","level":"high","assessor":"secondary"},{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":6.8,"vector":"AV:N/AC:M/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-294"],"updated_at":"2026-11-02T14:06:58.502206Z"}]}}