CVE-2025-21216 Internet Connection Sharing (ICS) Denial of Service Vulnerability
An attacker can cause a denial of service in Windows Internet Connection Sharing, affecting Windows 10 and 11 systems.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-21216?
CVE-2025-21216 is a medium-severity denial of service vulnerability in Microsoft Windows 10 1607, published on 11 Feb 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Internet Connection Sharing (ICS) Denial of Service Vulnerability
Weakness: CWE-125
Which versions are affected by CVE-2025-21216?
It affects 12 products.
Products include Microsoft Windows 10 1607, Microsoft Windows 10 1809, Microsoft Windows 10 21h2, Microsoft Windows 10 22h2, Microsoft Windows 11 22h2, Microsoft Windows 11 23h2 and 6 more.
How do I fix CVE-2025-21216?
No fix has been published for CVE-2025-21216 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-21216 being exploited?
There is no known exploitation of CVE-2025-21216 in the wild and no public exploit code.
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-x2mr-xj96-pc8h.