CVE-2021-41361 Active Directory Federation Server Spoofing Vulnerability
Attackers can spoof Active Directory Federation Services to bypass authentication controls on Windows Server.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2021-41361?
CVE-2021-41361 is a medium-severity authentication bypass vulnerability in Microsoft Windows Server 2016, published on 13 Oct 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Active Directory Federation Server Spoofing Vulnerability
Which versions are affected by CVE-2021-41361?
It affects 3 products.
Products include Microsoft Windows Server 2016, Microsoft Windows Server 2019, Microsoft Windows Server 2022.
How do I fix CVE-2021-41361?
No fix has been published for CVE-2021-41361 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2021-41361 being exploited?
There is no known exploitation of CVE-2021-41361 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Windows Server 2016
- CVE-2021-34458 Windows Kernel Remote Code Execution Vulnerability
- CVE-2024-38076 Windows Remote Desktop Licensing Service Remote Code Execution Vulnerability
- CVE-2026-27928 Windows Hello Security Feature Bypass Vulnerability
- CVE-2025-27482 Windows Remote Desktop Services Remote Code Execution Vulnerability
- CVE-2024-49106 Windows Remote Desktop Services Remote Code Execution Vulnerability
Sources
Also known as GHSA-w5wj-j6jx-xf6h.