CVE-2026-20820: Windows Common Log File System Driver Elevation of Privilege Vulnerability
Heap-based buffer overflow in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.
Other sources
Windows Common Log File System Driver Elevation of Privilege Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
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Fixed in 6.0.6003.23717Patch KB5073700 - Upgrade
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Fixed in 6.3.9600.22968Patch KB5073696 - Upgrade
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Fixed in 10.0.14393.8783Patch KB5073722 - Upgrade
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Fixed in 6.1.7601.28117Patch KB5073699 - Upgrade
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Fixed in 6.2.9200.25868Patch KB5073698 - Upgrade
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Fixed in 10.0.26100.32230Patch KB5073379 - Upgrade
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Fixed in 10.0.26100.7623Patch KB5074109 - Upgrade
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Fixed in 10.0.22631.6491Patch KB5073455 - Upgrade
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Fixed in 10.0.19045.6809Patch KB5073724 - Upgrade
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Fixed in 10.0.26200.7623Patch KB5074109 - Upgrade
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Fixed in 10.0.25398.2092Patch KB5073450 - Upgrade
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Fixed in 10.0.19044.6809Patch KB5073724 - Upgrade
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Fixed in 10.0.17763.8276Patch KB5073723 - Upgrade
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Fixed in 10.0.20348.4648Patch KB5073457
Event History
Frequently Asked Questions
What is the severity of CVE-2026-20820?
CVE-2026-20820 has a severity rating that indicates an elevation of privilege vulnerability.
How do I fix CVE-2026-20820?
To fix CVE-2026-20820, apply the appropriate patches released by Microsoft for your affected Windows version.
Which products are affected by CVE-2026-20820?
CVE-2026-20820 affects several Microsoft products including Windows Server and Windows 10.
What type of vulnerability is CVE-2026-20820?
CVE-2026-20820 is classified as an elevation of privilege vulnerability due to heap-based buffer overflow.
Can CVE-2026-20820 be exploited remotely?
CVE-2026-20820 requires local access for an attacker to exploit the vulnerability.