CVE-2026-83679: Windows Defender Firewall Service Elevation of Privilege Vulnerability
Use after free in Windows Defender Firewall Service allows an authorized attacker to elevate privileges locally.
Other sources
Windows Defender Firewall Service Elevation of Privilege Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.9711Patch KB5127648 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.28000.3231Patch KB5127646 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26200.9711Patch KB5127648 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.33650Patch KB5126646 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26300.9711Patch KB5127648 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.22631.7652Patch KB5126653
Event History
Frequently Asked Questions
Which systems are listed as affected?
The affected software list includes Microsoft Windows 11, Microsoft Windows Server 2025, and Microsoft Windows Defender Firewall.
What level of access does an attacker need?
An attacker must already be authorized on the affected system and able to act locally. The supplied information does not indicate that remote exploitation or user interaction is required.