{"id":"CVE-2021-27657","aliases":["EUVD-2021-14403","GHSA-g3gv-gq3r-m3m6"],"status":"published","title":"Metasys Improper Privilege Management","description":"Successful exploitation of this vulnerability could give an authenticated Metasys user an unintended level of access to the server file system, allowing them to access or modify system files by sending specifically crafted web messages to the Metasys system. This issue affects: Johnson Controls Metasys version 11.0 and prior versions.","severity":{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.01245,"percentile":0.69528,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-269"],"published":"2021-06-04T14:07:39Z","modified":"2026-06-17T03:45:18Z","products":[{"vendor":"johnson controls","product":"metasys"},{"vendor":"johnsoncontrols","product":"metasys"}],"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://us-cert.cisa.gov/ics/advisories/icsa-21-159-01","tags":["third-party-advisory","x_refsource_CERT","x_transferred","Third Party Advisory","US Government Resource"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-27657"},{"url":"https://github.com/advisories/GHSA-g3gv-gq3r-m3m6"}],"sources":{"cve":[{"id":"CVE-2021-27657","title":"Metasys Improper Privilege Management","description":"Successful exploitation of this vulnerability could give an authenticated Metasys user an unintended level of access to the server file system, allowing them to access or modify system files by sending specifically crafted web messages to the Metasys system. This issue affects: Johnson Controls Metasys version 11.0 and prior versions.","status":"published","published":"2021-06-04T14:07:39.073Z","modified":"2024-09-17T00:51:44.651Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-269"],"updated_at":"2026-11-02T14:33:04.679189Z"}],"euvd":[{"id":"EUVD-2021-14403","description":"Successful exploitation of this vulnerability could give an authenticated Metasys user an unintended level of access to the server file system, allowing them to access or modify system files by sending specifically crafted web messages to the Metasys system. This issue affects: Johnson Controls Metasys version 11.0 and prior versions.","status":"published","published":"2021-06-04T14:07:39Z","modified":"2024-09-17T00:51:44Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-03T00:28:54.932148Z"}],"ghsa":[{"id":"GHSA-g3gv-gq3r-m3m6","title":"Successful exploitation of this vulnerability could give an authenticated Metasys user an...","description":"Successful exploitation of this vulnerability could give an authenticated Metasys user an unintended level of access to the server file system, allowing them to access or modify system files by sending specifically crafted web messages to the Metasys system. This issue affects: Johnson Controls Metasys version 11.0 and prior versions.","status":"published","published":"2022-05-24T19:04:06Z","modified":"2023-01-29T05:06:53Z","cwes":["CWE-269"],"updated_at":"2026-11-02T14:46:06.857512Z"}],"nvd":[{"id":"CVE-2021-27657","description":"Successful exploitation of this vulnerability could give an authenticated Metasys user an unintended level of access to the server file system, allowing them to access or modify system files by sending specifically crafted web messages to the Metasys system. This issue affects: Johnson Controls Metasys version 11.0 and prior versions.","status":"published","published":"2021-06-04T15:15:07.517Z","modified":"2026-06-17T03:45:18.45Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"},{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":6.5,"vector":"AV:N/AC:L/Au:S/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-269"],"updated_at":"2026-11-02T14:06:53.987491Z"}]}}