What is CVE-2021-40456?

CVE-2021-40456 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. Windows AD FS Security Feature Bypass Vulnerability

Which CVE IDs does CVE-2021-40456 cover?

CVE-2021-40456 covers the following CVE IDs: CVE-2021-40456. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2021-40456?

CVE-2021-40456 has a CVSS v3 base score of 5.3, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2021-40456?

CVE-2021-40456 affects 6 products, including: Windows Server 2019; Windows Server 2019 (Server Core installation); Windows Server 2022; Windows Server 2022 (Server Core installation); Windows Server, version 2004 (Server Core installation); and others — see the full list on the advisory page.

CVE-2021-40456HighCVSS 5.3

Windows AD FS Security Feature Bypass Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

October 12, 2021

Last Modified

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🔗 CVE IDs covered (1)

CVE-2021-40456 →

📋 Description

What kind of security feature could be bypassed by successfully exploiting this vulnerability? This vulnerability could allow an attacker to bypass ADFS BannedIPList entries for WS-Trust workflows.

🎯 Affected products6

Windows Server 2019
Windows Server 2019 (Server Core installation)
Windows Server 2022
Windows Server 2022 (Server Core installation)
Windows Server, version 2004 (Server Core installation)
Windows Server, version 20H2 (Server Core Installation)

✅ Remediation

KB5006672 (Security Update) — fixed build 10.0.17763.2237 KB5006699 (Security Update) — fixed build 10.0.20348.288 KB5006670 (Security Update) — fixed build 10.0.19041.1288 KB5006670 (Security Update) — fixed build 10.0.19042.1288

🔗 References (6)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-40456
patchhttps://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5006672
referencehttps://support.microsoft.com/help/5006672
patchhttps://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5006699
patchhttps://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5006670
referencehttps://support.microsoft.com/help/5006670