CVE-2021-40456 : Windows AD FS Security Feature Bypass Vulnerability

Windows AD FS Security Feature Bypass Vulnerability

Published 2021-10-13 01:15:10

Updated 2024-08-01 13:42:21

View at NVD, CVE.org

Products affected by CVE-2021-40456

Microsoft » Windows Server » Version: 20h2
cpe:2.3:o:microsoft:windows_server:20h2:*:*:*:*:*:*:*
Matching versions
Microsoft » Windows Server 2019 » Version: N/A
cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:*
Matching versions
Microsoft » Windows Server 2022
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
Matching versions

EPSS FAQ

2.99%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 85 %

Percentile, the proportion of vulnerabilities that are scored at or less

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
5.0	MEDIUM	AV:N/AC:L/Au:N/C:P/I:N/A:N	10.0	2.9	NIST
Access Vector: Network Access Complexity: Low Authentication: None Confidentiality Impact: Partial Integrity Impact: None Availability Impact: None
7.5	HIGH	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N	3.9	3.6	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: High Integrity: None Availability: None
5.3	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N	3.9	1.4	Microsoft Corporation
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: Low Integrity: None Availability: None

CWE-863 Incorrect Authorization

The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.

Assigned by: 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-40456

CVE-2021-40456 - Security Update Guide - Microsoft - Windows AD FS Security Feature Bypass Vulnerability
Patch;Vendor Advisory

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