CVE-2021-34458 Windows Kernel Remote Code Execution Vulnerability
An attacker can execute arbitrary code on Windows Server systems via a kernel vulnerability, requiring immediate patching.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-34458?
CVE-2021-34458 is a critical code injection vulnerability in Microsoft Windows Server 2016, published on 16 Jul 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Windows Kernel Remote Code Execution Vulnerability
Which versions are affected by CVE-2021-34458?
It affects 2 products.
Products include Microsoft Windows Server 2016, Microsoft Windows Server 2019.
How do I fix CVE-2021-34458?
No fix has been published for CVE-2021-34458 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2021-34458 being exploited?
There is no known exploitation of CVE-2021-34458 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Windows Server 2016
- 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
- CVE-2024-49108 Windows Remote Desktop Services Remote Code Execution Vulnerability
Sources
Also known as GHSA-35fh-hcwr-mcv6.