CVE-2021-34525 Windows DNS Server Remote Code Execution Vulnerability
Remote attackers can execute arbitrary code on Windows DNS Server via a memory corruption 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-2021-34525?
CVE-2021-34525 is a high-severity memory corruption vulnerability in Microsoft Windows Server 2012, published on 14 Jul 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Windows DNS Server Remote Code Execution Vulnerability
Which versions are affected by CVE-2021-34525?
It affects 3 products.
Products include Microsoft Windows Server 2012, Microsoft Windows Server 2016, Microsoft Windows Server 2019.
How do I fix CVE-2021-34525?
No fix has been published for CVE-2021-34525 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2021-34525 being exploited?
There is no known exploitation of CVE-2021-34525 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Windows Server 2012
- CVE-2025-59287 Microsoft Windows Server Update Service (WSUS) Deserialization of Untrusted Data
- CVE-2026-69595 Windows Services for NFS ONCRPC XDR Driver Remote Code Execution Vulnerability
- CVE-2026-78445 Windows Services for NFS ONCRPC XDR Driver Remote Code Execution Vulnerability
- CVE-2026-41089 Windows Netlogon Remote Code Execution Vulnerability
- CVE-2024-43639 Windows KDC Proxy Remote Code Execution Vulnerability
Sources
Also known as GHSA-5jx6-vwcr-r4rq.