CVE-2026-20875: Windows Local Security Authority Subsystem Service (LSASS) Denial of Service Vulnerability
This Microsoft advisory covers CVE-2026-20875 in Windows Server 2008 R2 Service Pack 1 (Server Core installation), Windows Server 2008 Service Pack 2 (Server Core installation) and Windows Server 2012 (Server Core installation).
- CVE-2026-20875
Key facts
- Vendor rating
- High, CVSS 7.5
- CISA KEV
- Not listed (catalogue checked )
- Affected
- Windows 10 Version 1607 10.0.14393.0 before 10.0.14393.8783; Windows 10 Version 1809 10.0.17763.0 before 10.0.17763.8276; Windows 10 Version 21H2 10.0.19044.0 before 10.0.19044.6809 and 9 more below
- Fixed in
- 10.0.14393.8783, 10.0.17763.8276, 10.0.19044.6809 and 9 more below
- Source published
- Source revised
- Listed by VulniPulse
Compiled by VulniPulse from the linked sources. How records are collected and checked.
Affected products & platforms
Description
Null pointer dereference in Windows Local Security Authority Subsystem Service (LSASS) allows an unauthorized attacker to deny service over a network.
Affected products named by the advisory: Windows Server 2008 R2 Service Pack 1; Windows Server 2008 R2 Service Pack 1 (Server Core installation); Windows Server 2008 Service Pack 2; Windows Server 2008 Service Pack 2 (Server Core installation); and 12 more.
Affected products named by the advisory: Windows Server 2012 (Server Core installation); Windows Server 2012 R2 (Server Core installation); Windows Server 2016 (Server Core installation); Windows Server 2019 (Server Core installation); and 2 more.
Text from the source record.
- Windows 10 Version 1607 10.0.14393.0 before 10.0.14393.8783
- Windows 10 Version 1809 10.0.17763.0 before 10.0.17763.8276
- Windows 10 Version 21H2 10.0.19044.0 before 10.0.19044.6809
- Windows 10 Version 22H2 10.0.19045.0 before 10.0.19045.6809
- Windows 11 version 23H2 10.0.22631.0 before 10.0.22631.6491
- Windows 11 Version 23H2 10.0.22631.0 before 10.0.22631.6491
- Windows 11 Version 24H2 10.0.26100.0 before 10.0.26100.7623
- Windows 11 Version 25H2 10.0.26200.0 before 10.0.26200.7623
- Windows Server 2008 R2 Service Pack 1 6.1.7601.0 before 6.1.7601.28117
- Windows Server 2008 R2 Service Pack 1 (Server Core installation) 6.1.7601.0 before 6.1.7601.28117
- Windows Server 2008 Service Pack 2 6.0.6003.0 before 6.0.6003.23717
- Windows Server 2008 Service Pack 2 (Server Core installation) 6.0.6003.0 before 6.0.6003.23717
Official advisory · high-confidence parse· fetched ·verify at source
How to fix CVE-2026-20875
Upgrade to a fixed release named by Microsoft:
- 10.0.14393.8783
- 10.0.17763.8276
- 10.0.19044.6809
- 10.0.19045.6809
- 10.0.22631.6491
- 10.0.26100.7623
- 10.0.26200.7623
- 6.1.7601.28117
- 6.0.6003.23717
- 6.2.9200.25868
- 6.3.9600.22968
- 10.0.20348.4648
End-of-life dates for Windows Server
More Microsoft Server advisories
CVE-2026-88229Nov 10, 2026Windows Media Player Remote Code Execution VulnerabilityCVE-2026-95874Nov 10, 2026Xbox Gaming Services Elevation of Privilege VulnerabilityCVE-2026-120000Nov 10, 2026Microsoft Office SharePoint Remote Code Execution VulnerabilityCVE-2026-124210Nov 10, 2026Microsoft Office SharePoint Information Disclosure VulnerabilityCVE-2026-123391Nov 10, 2026Microsoft Office SharePoint Elevation of Privilege VulnerabilityCVE-2026-123390Nov 10, 2026Microsoft Office SharePoint Remote Code Execution Vulnerability
Microsoft Server advisories, January 2026All Microsoft Server advisories
Get an email when Windows Server publishes the next one.
See Windows Server's last 90 days of advisories first. Then choose one product with live alerts free for life, or a free month of real-time alerts on everything with the severity, the fixed version and the vendor's link (card needed, then US$15/month; we email you before the first charge).
iPhone and Android apps · New on the App Store
Monitor future Microsoft Server CVEs from your phone.
Choose a whole vendor or a precise platform, then receive matching security advisories by phone notification, email, or both. Coverage follows 34 official vendor sources and 160+ reviewed platform categories.
