CVE-2026-83665 Windows DHCP Server Denial of Service Vulnerability
An unauthorized attacker can cause a denial of service in Windows DHCP Server via a null pointer dereference.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-83665?
CVE-2026-83665 is a high-severity vulnerability in Microsoft Windows 10 1809, published on 13 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Null pointer dereference in Windows DHCP Server allows an unauthorized attacker to deny service over a network.
Weakness: CWE-476
Which versions are affected by CVE-2026-83665?
It affects 6 products.
Products include Microsoft Windows 10 1809, Microsoft Windows Server 2012, Microsoft Windows Server 2016, Microsoft Windows Server 2019, Microsoft Windows Server 2022, Microsoft Windows Server 2025.
How do I fix CVE-2026-83665?
No fix has been published for CVE-2026-83665 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-83665 being exploited?
There is no known exploitation of CVE-2026-83665 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Windows 10 1809
- CVE-2024-29988 Microsoft SmartScreen Prompt Security Feature Bypass
- CVE-2024-21412 Microsoft Windows Internet Shortcut Files Security Feature Bypass
- CVE-2025-62221 Microsoft Windows Use After Free
- CVE-2025-30400 Microsoft Windows DWM Core Library Use-After-Free
- CVE-2024-21338 Microsoft Windows Kernel Exposed IOCTL with Insufficient Access Control
Sources
Also known as GHSA-pgx8-r9j4-5qxr.