How severe is CVE-2021-36949?

CVE-2021-36949 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over an adjacent network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-36949 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-36949?

CVE-2021-36949 primarily affects Microsoft Azure Active Directory Connect. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-36949?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-36949 published?

CVE-2021-36949 was published on 2021-08-12 and last updated on 2026-06-17.

CVE-2021-36949

CVE-2021-36949 is a high-severity vulnerability in Microsoft Azure Active Directory Connect with a CVSS 3.x base score of 7.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-287.

Key facts

Severity: High (CVSS 3.x base score 7.1)
CVSS v2: 4.9
EPSS exploit prediction: 1% (65th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Microsoft Azure Active Directory Connect
Published: 2021-08-12
Last modified: 2026-06-17

Description

Microsoft Azure Active Directory Connect Authentication Bypass Vulnerability

Frequently asked questions

What is CVE-2021-36949?: Microsoft Azure Active Directory Connect Authentication Bypass Vulnerability
How severe is CVE-2021-36949?: CVE-2021-36949 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over an adjacent network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-36949 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-36949?: CVE-2021-36949 primarily affects Microsoft Azure Active Directory Connect. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-36949?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-36949 published?: CVE-2021-36949 was published on 2021-08-12 and last updated on 2026-06-17.

References

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

Affected products (2)

cpe:2.3:a:microsoft:azure_active_directory_connect:*:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:azure_active_directory_connect_provisioning_agent:*:*:*:*:*:*:*:*

More vulnerabilities in Microsoft Azure Active Directory Connect

CVE-2017-8613 — High (CVSS 8.1): Azure AD Connect Password writeback, if misconfigured during enablement, allows an attacker to reset passwords and gain…
CVE-2019-1000 — Medium (CVSS 5.3): An elevation of privilege vulnerability exists in Microsoft Azure Active Directory Connect build 1.3.20.0, which allows…

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Other CWE-287 (Improper Authentication) vulnerabilities

CVE-2026-45480 — Critical (CVSS 10.0): Improper authentication in Azure Active Directory allows an unauthorized attacker to elevate privileges over a network.
CVE-2026-46389 — Critical (CVSS 10.0): UDS Identity Config builds the Keycloak configuration image (realm, plugins, theme, truststore, JARs) consumed by UDS…
CVE-2026-10611 — Critical (CVSS 10.0): An authentication bypass vulnerability exists in MISP when LDAP mixed authentication is enabled with OTP enforcement.…
CVE-2026-47280 — Critical (CVSS 10.0): Improper authentication in Azure Resource Manager (ARM) allows an unauthorized attacker to elevate privileges over a…
CVE-2026-42822 — Critical (CVSS 10.0): Improper authentication in Azure Local Disconnected Operations allows an unauthorized attacker to elevate privileges…
CVE-2026-20182 — Critical (CVSS 10.0): May 2026: This security advisory provides the details and fix information for a vulnerability that was discovered and…

Browse all CWE-287 (Improper Authentication) vulnerabilities →