CVE-2026-21525: Microsoft Windows NULL Pointer Dereference Vulnerability
Microsoft Windows Remote Access Connection Manager contains a NULL pointer dereference that could allow an unauthorized attacker to deny service locally.
Other sources
Null pointer dereference in Windows Remote Access Connection Manager allows an unauthorized attacker to deny service locally.
— Microsoft
Windows Remote Access Connection Manager Denial of Service Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
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Fixed in 10.0.28000.1575Patch KB5077179 - Upgrade
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Fixed in 6.3.9600.23022Patch KB5075970 - Upgrade
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Fixed in 10.0.14393.8868Patch KB5075999 - Upgrade
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Fixed in 6.2.9200.25923Patch KB5075971 - Upgrade
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Fixed in 10.0.26100.32370Fixed in 10.0.26100.32313Patch KB5075942 - Upgrade
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Fixed in 10.0.26100.7840Fixed in 10.0.26100.7781Patch KB5077212 - Upgrade
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Fixed in 10.0.22631.6649Patch KB5075941 - Upgrade
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Fixed in 10.0.26200.7840Fixed in 10.0.26200.7781Patch KB5077212 - Upgrade
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Fixed in 10.0.25398.2149Patch KB5075897 - Upgrade
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Fixed in 10.0.19045.6937Patch KB5075912 - Upgrade
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Fixed in 10.0.19044.6937Patch KB5075912 - Upgrade
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Fixed in 10.0.20348.4773Fixed in 10.0.20348.4711Patch KB5075943 - Upgrade
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Fixed in 10.0.17763.8389Patch KB5075904
Event History
Frequently Asked Questions
What is the severity of CVE-2026-21525?
CVE-2026-21525 has a severity rating that indicates it can lead to a denial of service attack.
How do I fix CVE-2026-21525?
To fix CVE-2026-21525, it is essential to apply the appropriate security patches from Microsoft based on your affected software version.
Which versions of Windows are affected by CVE-2026-21525?
CVE-2026-21525 affects various versions of Microsoft Windows, including Windows 10, Windows 11, and Windows Server editions.
What type of vulnerability is CVE-2026-21525?
CVE-2026-21525 is classified as a NULL pointer dereference vulnerability.
Can CVE-2026-21525 be exploited remotely?
CVE-2026-21525 is categorized as a local denial of service vulnerability, meaning it cannot be exploited remotely.