Privilege escalation via Core Messaging heap overflow
Published Mar 11, 2025 · Updated Feb 26, 2026
A heap-based buffer overflow in Microsoft Windows Core Messaging allows remote authenticated users to elevate privileges over a network. Microsoft has not published the input, code path, or incorrect memory operation responsible for overwriting the heap allocation. Exploitation requires existing low-privileged access and favorable heap conditions, and successful exploitation grants elevated control of the affected system.
Summary
What happened
A heap-based buffer overflow in Microsoft Windows Core Messaging allows remote authenticated users to elevate privileges over a network. Microsoft has not published the input, code path, or incorrect memory operation responsible for overwriting the heap allocation. Exploitation requires existing low-privileged access and favorable heap conditions, and successful exploitation grants elevated control of the affected system.
The record
- CVE
- CVE-2025-26634
- Published
- Mar 11, 2025
- Updated
- Feb 26, 2026
- Vendor
- Microsoft
- Product
- Windows 10 Version 1507
- Classifications
- CWE-122, T1068
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Mar 11, 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=10.0.10240.0 <10.0.10240.20915
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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