Local privilege escalation via heap buffer overflow
Published Oct 14, 2025 · Updated Feb 26, 2026
Heap-based buffer overflow in Microsoft Windows DWM Core Library allows local users to elevate privileges on affected Windows releases. Microsoft identifies the heap overwrite but has not disclosed the responsible function, input path, or malformed data operation. Exploitation requires an authenticated local user and can grant that user higher privileges while compromising system confidentiality, integrity, and availability.
Summary
What happened
Heap-based buffer overflow in Microsoft Windows DWM Core Library allows local users to elevate privileges on affected Windows releases. Microsoft identifies the heap overwrite but has not disclosed the responsible function, input path, or malformed data operation. Exploitation requires an authenticated local user and can grant that user higher privileges while compromising system confidentiality, integrity, and availability.
The record
- CVE
- CVE-2025-59255
- Published
- Oct 14, 2025
- Updated
- Feb 26, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-122, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Oct 14, 2025CVE publishedPublication date reported by the CVE source.
- Feb 26, 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 <10.0.17763.7919
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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