CVE-2021-42306

high Microsoft
CVSS v3 Base Score
8.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
EPSS Score
8.5%
Exploitation probability in 30 days
Top 8% most likely to be exploited
Attack Characteristics
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Confidentiality
High
Integrity
High
Availability
None
Published: November 24, 2021 (1633 days ago)
Last Modified: February 24, 2026
Vendor: Microsoft

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. 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.

CWE

CWE-522

Affected Products

microsoft azure active directorymicrosoft azure active site recoverymicrosoft azure automationmicrosoft azure migrate

References

🔗 portal.msrc.microsoft.com 🔗 portal.msrc.microsoft.com