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CVE-2021-36949: Microsoft Azure Active Directory Connect Authentication Bypass Vulnerability

• Severity: medium (CVSS 4.9 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-08-12 · updated 2026-08-10
• Weakness: CWE-287

Description

Microsoft Azure Active Directory Connect Authentication Bypass Vulnerability

Affected products

• Microsoft Corporation Azure AD Connect: from 1.3.20.0 through 1.6.11.3; from 2.0.3.0 through 2.0.9.0
• Microsoft Azure Active Directory Connect Provisioning Agent: before 1.1.582.0 — fixed in 1.1.582.0
• Microsoft Azure Active Directory Connect Provisioning Agent: from 1.1.0.0 before 1.1.582.0 — fixed in 1.1.582.0
• Microsoft Azure Active Directory Connect 1.X.Y.Z: from 1.0.0.0 before 1.6.11.3 — fixed in 1.6.11.3
• Microsoft Azure Active Directory Connect 2.0.X.Y: from 2.0.0.0 before 2.0.8.0 — fixed in 2.0.8.0

How to fix

Upgrade to a fixed version: Microsoft Azure Active Directory Connect Provisioning Agent 1.1.582.0; Microsoft Azure Active Directory Connect Provisioning Agent 1.1.582.0; Microsoft Azure Active Directory Connect 1.X.Y.Z 1.6.11.3; Microsoft Azure Active Directory Connect 2.0.X.Y 2.0.8.0. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-36949
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-36949

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