CVE-2025-27473: HTTP.sys Denial of Service Vulnerability
First published: Tue Apr 08 2025(Updated: )
<p>Uncontrolled resource consumption in Windows HTTP.sys allows an unauthorized attacker to deny service over a network.</p>
Credit: secure@microsoft.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Windows 10 | =22H2 | |
| Microsoft Windows Server 2016 | ||
| Microsoft Windows Server 2019 | ||
| Windows 10 | =22H2 | |
| Microsoft Windows Server 2022 | ||
| Microsoft Windows Server | ||
| Windows 10 | =22H2 | |
| Microsoft Windows Server 2025 | ||
| Windows 10 | =21H2 | |
| Windows 11 | =23H2 | |
| Microsoft Windows Server 2022 | ||
| Microsoft Windows Server | ||
| Microsoft Windows Server 2008 R2 | ||
| Microsoft Windows Server 2012 R2 | ||
| Windows 10 | =1809 | |
| Microsoft Windows Server 2019 | ||
| Windows 11 | =22H2 | |
| Microsoft Windows Server | ||
| Windows 11 | =24H2 | |
| Windows 10 | =21H2 | |
| Microsoft Windows Server | ||
| Windows 11 | =24H2 | |
| Windows 11 | =23H2 | |
| Microsoft Windows Server 2016 | ||
| Windows 10 | =1607 | |
| Microsoft Windows Server 2012 R2 | ||
| Microsoft Windows Server | ||
| Windows 10 | =1607 | |
| Microsoft Windows Server 2008 R2 | ||
| Windows 10 | =1809 | |
| Windows 10 | =21H2 | |
| Windows 11 | =22H2 | |
| Microsoft Windows Server | ||
| Microsoft Windows Server 2025 | ||
| Microsoft Windows Server 2022 23H2 | ||
| Windows 10 | ||
| Windows 10 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2025-27473?
CVE-2025-27473 is classified as a denial-of-service vulnerability.
How do I fix CVE-2025-27473?
To fix CVE-2025-27473, apply the latest patches provided by Microsoft for the affected Windows products.
Which versions of Windows are affected by CVE-2025-27473?
CVE-2025-27473 affects Windows 10 (various versions), Windows Server 2016, 2019, 2022, 2025, and Windows Server 2008.
Can CVE-2025-27473 be exploited remotely?
Yes, CVE-2025-27473 can be exploited remotely by an unauthorized attacker to cause a denial of service.
What is the attack vector for CVE-2025-27473?
The attack vector for CVE-2025-27473 is via network communication, allowing an attacker to exhaust system resources.
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- canonical/windows 10
- version/windows 10/22h2
- canonical/microsoft windows server 2016
- canonical/microsoft windows server 2019
- canonical/microsoft windows server
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- canonical/microsoft windows server 2012 r2
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