CVE-2026-83869 Windows Domain Name Service Remote Code Execution Vulnerability
An integer underflow in the Windows DNS Server allows remote attackers to execute arbitrary code without authentication.
- 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-2026-83869?
CVE-2026-83869 is a critical vulnerability in Microsoft Windows 10 1607, published on 13 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Integer underflow (wrap or wraparound) in DNS Server allows an unauthorized attacker to execute code over a network.
Weakness: CWE-191
Which versions are affected by CVE-2026-83869?
It affects 14 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 8 more.
How do I fix CVE-2026-83869?
No fix has been published for CVE-2026-83869 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-83869 being exploited?
There is no known exploitation of CVE-2026-83869 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-54wv-qqqf-qfp6.