Auth bypass in Microsoft Windows Server
CVE-2021-40456
Windows AD FS Security Feature Bypass Vulnerability
Vulnerability class: Broken Access Control
EPSS: 0.022 (80.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
Affected products
- Microsoft Windows_server — versions 20h2
- Microsoft Windows Server 2019 — versions 10.0.0
- Microsoft Windows_server_2019
- Microsoft Windows Server 2019 (Server Core Installation) — versions 10.0.0
- Microsoft Windows Server 2022 — versions 10.0.0
- Microsoft Windows_server_2022
- Microsoft Windows Server Version 2004 — versions 10.0.0
- Microsoft Windows Server Version 20h2 — versions 10.0.0
Weakness classification (CWE)
References
- secure@microsoft.com (Patch, x_refsource_MISC, Vendor Advisory)
Frequently asked questions
- What is CVE-2021-40456?
- CVE-2021-40456 is a medium-severity vulnerability in Microsoft Windows Server, classified under Incorrect Authorization. CVSS score: 5.3/10. Published 2021-10-13.
- How severe is CVE-2021-40456?
- Medium severity. CVSS v3 base score is 5.3 out of 10.