{"id":"CVE-2021-1638","aliases":["EUVD-2021-7105","GHSA-j3p8-mm22-v647"],"status":"published","title":"Windows Bluetooth Security Feature Bypass Vulnerability","description":"Microsoft is aware of the \u0026quot;Impersonation in the Passkey Entry Protocol\u0026quot; vulnerability. For more information regarding the vulnerability, please see this statement from the Bluetooth SIG.\nTo address the vulnerability, Microsoft has released a software update that will fail attempts to pair if the remote device exchanges a public key with the same X coordinate as the locally exchanged public key","severity":{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.01229,"percentile":0.69148,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-863"],"published":"2021-01-12T19:41:56Z","modified":"2026-06-17T03:32:12Z","products":[{"vendor":"microsoft","product":"windows 10 version 1803"},{"vendor":"microsoft","product":"windows 10 version 1809"},{"vendor":"microsoft","product":"windows 10 version 1909"},{"vendor":"microsoft","product":"windows 10 version 2004"},{"vendor":"microsoft","product":"windows 10 version 20h2"},{"vendor":"microsoft","product":"windows server 2019"},{"vendor":"microsoft","product":"windows server 2019 (server core installation)"},{"vendor":"microsoft","product":"windows server version 2004"},{"vendor":"microsoft","product":"windows server version 20h2"},{"vendor":"microsoft","product":"windows server, version 1909 (server core installation)"},{"vendor":"microsoft","product":"windows_10"},{"vendor":"microsoft","product":"windows_server_2016"},{"vendor":"microsoft","product":"windows_server_2019"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-1638","tags":["vendor-advisory"]},{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1638","tags":["x_refsource_MISC","x_transferred"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-1638"},{"url":"https://github.com/advisories/GHSA-j3p8-mm22-v647"}],"sources":{"cve":[{"id":"CVE-2021-1638","title":"Windows Bluetooth Security Feature Bypass Vulnerability","description":"Microsoft is aware of the \u0026quot;Impersonation in the Passkey Entry Protocol\u0026quot; vulnerability. For more information regarding the vulnerability, please see this statement from the Bluetooth SIG.\nTo address the vulnerability, Microsoft has released a software update that will fail attempts to pair if the remote device exchanges a public key with the same X coordinate as the locally exchanged public key","status":"published","published":"2021-01-12T19:41:56Z","modified":"2024-10-08T16:17:35.308Z","cvss":[{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C","level":"high","assessor":"cna"}],"updated_at":"2026-11-02T14:33:08.409321Z"}],"euvd":[{"id":"EUVD-2021-7105","description":"Microsoft is aware of the \u0026quot;Impersonation in the Passkey Entry Protocol\u0026quot; vulnerability. For more information regarding the vulnerability, please see this statement from the Bluetooth SIG.\nTo address the vulnerability, Microsoft has released a software update that will fail attempts to pair if the remote device exchanges a public key with the same X coordinate as the locally exchanged public key","status":"published","published":"2021-01-12T19:41:56Z","modified":"2024-10-08T16:17:35Z","cvss":[{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C","level":"high"}],"updated_at":"2026-11-03T00:27:45.386789Z"}],"ghsa":[{"id":"GHSA-j3p8-mm22-v647","title":"Windows Bluetooth Security Feature Bypass Vulnerability This CVE ID is unique from CVE-2021-1683,...","description":"Windows Bluetooth Security Feature Bypass Vulnerability This CVE ID is unique from CVE-2021-1683, CVE-2021-1684.","status":"published","published":"2022-05-24T17:38:43Z","modified":"2024-10-08T18:33:57Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-863"],"updated_at":"2026-11-02T14:58:27.293589Z"}],"nvd":[{"id":"CVE-2021-1638","description":"Microsoft is aware of the \u0026quot;Impersonation in the Passkey Entry Protocol\u0026quot; vulnerability. For more information regarding the vulnerability, please see this statement from the Bluetooth SIG.\nTo address the vulnerability, Microsoft has released a software update that will fail attempts to pair if the remote device exchanges a public key with the same X coordinate as the locally exchanged public key","status":"published","published":"2021-01-12T20:15:30.277Z","modified":"2026-06-17T03:32:12.797Z","cvss":[{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high","assessor":"secondary"},{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"secondary"},{"version":"2.0","score":2.1,"vector":"AV:L/AC:L/Au:N/C:P/I:N/A:N","level":"low","assessor":"primary"}],"updated_at":"2026-11-02T14:06:49.284888Z"}]}}