Local privilege escalation via out-of-bounds read
Published Dec 9, 2025 · Updated Apr 16, 2026
Out-of-bounds read in Windows Projected File System allows local users with low privileges to elevate privileges on affected Windows builds. The component reads past a buffer boundary while processing local input, but Microsoft has not disclosed the affected function or input format. Successful exploitation grants elevated privileges; no user interaction is required beyond the attacker's existing local access.
Summary
What happened
Out-of-bounds read in Windows Projected File System allows local users with low privileges to elevate privileges on affected Windows builds. The component reads past a buffer boundary while processing local input, but Microsoft has not disclosed the affected function or input format. Successful exploitation grants elevated privileges; no user interaction is required beyond the attacker's existing local access.
The record
- CVE
- CVE-2025-55233
- Published
- Dec 9, 2025
- Updated
- Apr 16, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-125, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Dec 9, 2025CVE publishedPublication date reported by the CVE source.
- Apr 16, 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=10.0.17763.0 <10.0.17763.8146
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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