CVE-2026-83665

HighCVSS 7.5/10Last modified Oct 29, 2026

Description

Null pointer dereference in Windows DHCP Server allows an unauthorized attacker to deny service over a network.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-476

Affected software

Vendor	Product	Versions
Microsoft	Windows 10 Version 1607	>= 10.0.14393.0, < 10.0.14393.9612
Microsoft	Windows 10 Version 1809	>= 10.0.17763.0, < 10.0.17763.9376
Microsoft	Windows Server 2012	>= 6.2.9200.0, < 6.2.9200.26434
Microsoft	Windows Server 2012 (Server Core installation)	>= 6.2.9200.0, < 6.2.9200.26434
Microsoft	Windows Server 2012 R2	>= 6.3.9600.0, < 6.3.9600.23470
Microsoft	Windows Server 2012 R2 (Server Core installation)	>= 6.3.9600.0, < 6.3.9600.23470
Microsoft	Windows Server 2016	>= 10.0.14393.0, < 10.0.14393.9612
Microsoft	Windows Server 2016 (Server Core installation)	>= 10.0.14393.0, < 10.0.14393.9612
Microsoft	Windows Server 2019	>= 10.0.17763.0, < 10.0.17763.9376
Microsoft	Windows Server 2019 (Server Core installation)	>= 10.0.17763.0, < 10.0.17763.9376
Microsoft	Windows Server 2022	>= 10.0.20348.0, < 10.0.20348.5761
Microsoft	Windows Server 2025	>= 10.0.26100.0, < 10.0.26100.33650
Microsoft	Windows Server 2025 (Server Core installation)	>= 10.0.26100.0, < 10.0.26100.33650

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83665Patch, Vendor Advisory

Timeline

Published: Oct 13, 2026
Last modified: Oct 29, 2026
NVD status: Analyzed

Related CVEs from 2026

CVE-2026-836667.0Concurrent execution using shared resource with improper synchronization ('race condition') in Active Directory Certificate Services (AD CS)CVE-2026-836676.5Out-of-bounds read in Active Directory Domain Services allows an authorized attacker to deny service over a network.CVE-2026-836685.5Out-of-bounds read in Windows WLAN Service allows an authorized attacker to disclose information locally.CVE-2026-836697.8Use of uninitialized resource in Windows Error Reporting allows an authorized attacker to elevate privileges locally.CVE-2026-83675.3aria2c accepts a server certificate with incorrect Extended Key Usage (EKU). If the attackers compromise a certificate (with the associated CVE-2026-836707.5Out-of-bounds read in Function Discovery Service (fdwsd.dll) allows an unauthorized attacker to disclose information over a network.CVE-2026-836716.5Out-of-bounds read in Windows Hyper-V allows an authorized attacker to disclose information locally.CVE-2026-836724.7Exposure of sensitive system information to an unauthorized control sphere in Windows Installer allows an authorized attacker to disclose in CVE-2026-836748.1Weak authentication in Active Directory Federation Services (AD FS) allows an unauthorized attacker to perform spoofing over a network.CVE-2026-836757.0Use after free in Windows Kernel allows an authorized attacker to elevate privileges locally.CVE-2026-836767.0Integer underflow (wrap or wraparound) in Windows Installer allows an authorized attacker to elevate privileges locally.CVE-2026-836777.5Missing release of memory after effective lifetime in Windows DHCP Client allows an unauthorized attacker to deny service over a network.