CVE-2026-69777 Windows DHCP Client Elevation of Privilege Vulnerability
An authorized attacker can elevate privileges via a heap-based buffer overflow in the Windows DHCP Client over an adjacent network.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-69777?
CVE-2026-69777 is a high-severity memory corruption vulnerability in Microsoft Windows 11 24h2, published on 8 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Heap-based buffer overflow in Windows DHCP Client allows an authorized attacker to elevate privileges over an adjacent network.
Weakness: CWE-122
Which versions are affected by CVE-2026-69777?
It affects 3 products.
Products include Microsoft Windows 11 24h2, Microsoft Windows 11 25h2, Microsoft Windows 11 26h1.
How do I fix CVE-2026-69777?
No fix has been published for CVE-2026-69777 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-2026-69777 being exploited?
There is no known exploitation of CVE-2026-69777 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Windows 11 24h2
- CVE-2025-60710 Microsoft Windows Link Following
- CVE-2026-54990 Remote Desktop Client Remote Code Execution Vulnerability
- CVE-2025-50165 Windows Graphics Component Remote Code Execution Vulnerability
- CVE-2025-21311 Windows NTLM V1 Elevation of Privilege Vulnerability
- CVE-2026-108463 Windows SmartScreen Security Feature Bypass Vulnerability
Sources
Also known as GHSA-7mwr-pr99-96pm.