CVE-2021-42306 json
Azure Active Directory Information Disclosure Vulnerability
published 2021-11-24 4 y ago modified 2026-08-19 2 mo ago also EUVD-2021-29281
- cvss
- 8.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 3.3%
- EPSS 3.3% chance of exploitation in 30 days, percentile 88%
- public exploits
- 0
- none known
Summary
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. Azure AD addressed this vulnerability by preventing disclosure of any private key values added to the application. Microsoft 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. For more details on this issue, please refer to the MSRC Blog Entry.
Patch / fix
- microsoft azure_active_directory 2021-10-30
- microsoft azure_active_site_recovery 2021-11-01
- microsoft azure_automation 2021-10-15
- microsoft azure_migrate 2021-11-02
Exploit prediction
3.27% chance of exploitation in the next 30 days, higher than 88% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.1 | 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 |
| CNA | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N |
| CNA | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
| NVD | 2.0 | 4.0 | AV:N/AC:L/Au:S/C:P/I:N/A:N |
Affected products
- Microsoft Azure Active Directory
- Microsoft Azure Automation
- Microsoft Azure Migrate
- Microsoft Azure Site Recovery
Classification
- Weakness
-
- CWE-522 Insufficiently Protected Credentials
References
-
msrc.microsoft.com
/update-guide/vulnerability/CVE-2021-42306
vendor-advisory, patch
-
portal.msrc.microsoft.com
/en-US/security-guidance/advisory/CVE-2021-42306
patch, vendor-advisory
Sources
- CVE List CVE-2021-42306
- NVD CVE-2021-42306
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