{"id":"CVE-2021-42306","aliases":["EUVD-2021-29281","GHSA-vxjx-p5m9-q5fr"],"status":"published","title":"Azure Active Directory Information Disclosure Vulnerability","description":"An information disclosure vulnerability manifests when a user or an application uploads unprotected private key data as part of an authentication certificate keyCredential  on an Azure AD Application or Service Principal (which is not recommended). This vulnerability allows a user or service in the tenant with application read access to read the private key data that was added to the application.\nAzure AD addressed this vulnerability by preventing disclosure of any private key values added to the application.\nMicrosoft has identified services that could manifest this vulnerability, and steps that customers should take to be protected. Refer to the FAQ section for more information.\nFor more details on this issue, please refer to the MSRC Blog Entry.","severity":{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.03266,"percentile":0.88567,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-522","CWE-668"],"published":"2021-11-24T01:05:13Z","modified":"2026-08-19T18:31:45Z","products":[{"vendor":"microsoft","product":"azure active directory"},{"vendor":"microsoft","product":"azure automation"},{"vendor":"microsoft","product":"azure migrate"},{"vendor":"microsoft","product":"azure site recovery"},{"vendor":"microsoft","product":"azure_active_directory"},{"vendor":"microsoft","product":"azure_active_site_recovery"},{"vendor":"microsoft","product":"azure_automation"},{"vendor":"microsoft","product":"azure_migrate"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-42306","tags":["vendor-advisory","patch"]},{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42306","tags":["x_refsource_MISC","x_transferred","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-42306"},{"url":"https://github.com/advisories/GHSA-vxjx-p5m9-q5fr"}],"sources":{"cve":[{"id":"CVE-2021-42306","title":"Azure Active Directory Information Disclosure Vulnerability","description":"An information disclosure vulnerability manifests when a user or an application uploads unprotected private key data as part of an authentication certificate keyCredential  on an Azure AD Application or Service Principal (which is not recommended). This vulnerability allows a user or service in the tenant with application read access to read the private key data that was added to the application.\nAzure AD addressed this vulnerability by preventing disclosure of any private key values added to the application.\nMicrosoft has identified services that could manifest this vulnerability, and steps that customers should take to be protected. Refer to the FAQ section for more information.\nFor more details on this issue, please refer to the MSRC Blog Entry.","status":"published","published":"2021-11-24T01:05:13Z","modified":"2026-08-19T16:27:27.22Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C","level":"high","assessor":"cna"}],"updated_at":"2026-11-02T14:32:58.739039Z"}],"euvd":[{"id":"EUVD-2021-29281","description":"An information disclosure vulnerability manifests when a user or an application uploads unprotected private key data as part of an authentication certificate keyCredential  on an Azure AD Application or Service Principal (which is not recommended). This vulnerability allows a user or service in the tenant with application read access to read the private key data that was added to the application.\nAzure AD addressed this vulnerability by preventing disclosure of any private key values added to the application.\nMicrosoft has identified services that could manifest this vulnerability, and steps that customers should take to be protected. Refer to the FAQ section for more information.\nFor more details on this issue, please refer to the MSRC Blog Entry.","status":"published","published":"2021-11-24T01:05:13Z","modified":"2026-08-19T16:27:27Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C","level":"high"}],"updated_at":"2026-11-02T18:01:42.811156Z"}],"ghsa":[{"id":"GHSA-vxjx-p5m9-q5fr","title":"Azure Active Directory Information Disclosure Vulnerability","description":"Azure Active Directory Information Disclosure Vulnerability","status":"published","published":"2021-11-25T00:00:39Z","modified":"2026-08-19T18:31:45Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-522","CWE-668"],"updated_at":"2026-11-02T15:10:40.943268Z"}],"nvd":[{"id":"CVE-2021-42306","description":"An information disclosure vulnerability manifests when a user or an application uploads unprotected private key data as part of an authentication certificate keyCredential  on an Azure AD Application or Service Principal (which is not recommended). This vulnerability allows a user or service in the tenant with application read access to read the private key data that was added to the application.\nAzure AD addressed this vulnerability by preventing disclosure of any private key values added to the application.\nMicrosoft has identified services that could manifest this vulnerability, and steps that customers should take to be protected. Refer to the FAQ section for more information.\nFor more details on this issue, please refer to the MSRC Blog Entry.","status":"published","published":"2021-11-24T01:15:08.363Z","modified":"2026-08-19T17:18:02.57Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","level":"high","assessor":"secondary"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"secondary"},{"version":"2.0","score":4,"vector":"AV:N/AC:L/Au:S/C:P/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-522"],"updated_at":"2026-11-02T14:07:01.428028Z"}]}}