Unauthenticated service interruption via undisclosed access-control flaw
Published Jun 10, 2025 · Updated Feb 20, 2026
Improper access control in Microsoft Windows Local Security Authority Server allows remote attackers to interrupt service over a network. Microsoft has not published the specific lsasrv access-control check, request field, or code path that mishandles untrusted network input. No authentication or user interaction is required, and the reported consequence is limited to loss of availability rather than data disclosure or modification.
Summary
What happened
Improper access control in Microsoft Windows Local Security Authority Server allows remote attackers to interrupt service over a network. Microsoft has not published the specific lsasrv access-control check, request field, or code path that mishandles untrusted network input. No authentication or user interaction is required, and the reported consequence is limited to loss of availability rather than data disclosure or modification.
The record
- CVE
- CVE-2025-33056
- Published
- Jun 10, 2025
- Updated
- Feb 20, 2026
- Vendor
- Microsoft
- Product
- Windows 10 Version 1507
- Classifications
- CWE-284, T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 10, 2025CVE publishedPublication date reported by the CVE source.
- Feb 20, 2026Record 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=10.0.10240.0 <10.0.10240.21034
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.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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