Unauthenticated service interruption via out-of-bounds read
Published Sep 9, 2025 · Updated Sep 9, 2025
Out-of-bounds read in HTTP.sys in affected Microsoft Windows 11 and Windows Server builds allows remote attackers to interrupt service. Microsoft identifies the locus as HTTP.sys but has not disclosed the request field, parser path, or invalid bounds operation. No authentication or user interaction is required; network traffic can make the HTTP service unavailable, with no reported data disclosure or modification.
Summary
What happened
Out-of-bounds read in HTTP.sys in affected Microsoft Windows 11 and Windows Server builds allows remote attackers to interrupt service. Microsoft identifies the locus as HTTP.sys but has not disclosed the request field, parser path, or invalid bounds operation. No authentication or user interaction is required; network traffic can make the HTTP service unavailable, with no reported data disclosure or modification.
The record
- CVE
- CVE-2025-53805
- Published
- Sep 9, 2025
- Updated
- Sep 9, 2025
- Vendor
- Microsoft
- Product
- Windows Server 2025 (Server Core installation)
- Classifications
- CWE-125, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 9, 2025CVE publishedPublication date reported by the CVE source.
- Sep 9, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=10.0.26100.0 <10.0.26100.6584
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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