CVE-2026-21525 Microsoft Windows NULL Pointer Dereference
An unauthorized local attacker can cause a denial of service in Windows Remote Access Connection Manager via a null pointer dereference.
- Exploited in the wild
- Since 10 Feb 2026
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-21525?
CVE-2026-21525 is a medium-severity vulnerability in Microsoft Windows 10 1607, published on 10 Feb 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Null pointer dereference in Windows Remote Access Connection Manager allows an unauthorized attacker to deny service locally.
Weakness: CWE-476
Which versions are affected by CVE-2026-21525?
It affects 13 products.
Products include Microsoft Windows 10 1607, Microsoft Windows 10 1809, Microsoft Windows 10 21h2, Microsoft Windows 10 22h2, Microsoft Windows 11 23h2, Microsoft Windows 11 24h2 and 7 more.
How do I fix CVE-2026-21525?
No fix has been published for CVE-2026-21525 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 3 Mar 2026.
Is CVE-2026-21525 being exploited?
Yes. Attackers have exploited CVE-2026-21525 in the wild since at least 10 Feb 2026.
Other vulnerabilities in Microsoft Windows 10 1607
- CVE-2026-33824 Microsoft Internet Key Exchange (IKE) Service Extensions Double Free
- CVE-2026-21510 Microsoft Windows Shell Protection Mechanism Failure
- CVE-2026-21513 Microsoft MSHTML Framework Protection Mechanism Failure
- CVE-2023-32049 Microsoft Windows Defender SmartScreen Security Feature Bypass
- CVE-2023-29360 Microsoft Streaming Service Untrusted Pointer Dereference
Sources
Also known as GHSA-cf8p-vhmm-h7g6.