Denial of Service Vulnerability in Microsoft Windows HTTP.sys
CVE-2025-27473

7.5HIGH

Key Information:

Vendor

Microsoft
Status
Windows 10 Version 1809
Windows Server 2019
Windows Server 2019 (server Core Installation)
Windows Server 2022
Vendor
CVE Published:
8 April 2025

What is CVE-2025-27473?

A vulnerability in Windows HTTP.sys allows attackers to exploit uncontrolled resource consumption, which can lead to denial of service. This can disrupt the operation of network services, making it critical for users and administrators to implement recommended security measures to mitigate potential impacts.

Affected Version(s)

Windows 10 Version 1507 32-bit Systems 10.0.10240.0 < 10.0.10240.20978

Windows 10 Version 1607 32-bit Systems 10.0.14393.0 < 10.0.14393.7969

Windows 10 Version 1809 32-bit Systems 10.0.17763.0 < 10.0.17763.7136

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisory

EPSS Score

26% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

JSON
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CVE-2025-27473 : Denial of Service Vulnerability in Microsoft Windows HTTP.sys