Local privilege escalation via HMAC heap overflow
Published Nov 14, 2023 · Updated Oct 8, 2025
Heap-based buffer overflow in Microsoft Windows HMAC key derivation allows local users to elevate privileges through crafted input. The public record maps the defect to CWE-122 but does not disclose the affected function, buffer, or unchecked operation in the HMAC key-derivation path. Exploitation requires existing low-privileged local access and grants unspecified elevated privileges beyond the caller's security boundary.
Summary
What happened
Heap-based buffer overflow in Microsoft Windows HMAC key derivation allows local users to elevate privileges through crafted input. The public record maps the defect to CWE-122 but does not disclose the affected function, buffer, or unchecked operation in the HMAC key-derivation path. Exploitation requires existing low-privileged local access and grants unspecified elevated privileges beyond the caller's security boundary.
The record
- CVE
- CVE-2023-36400
- Published
- Nov 14, 2023
- Updated
- Oct 8, 2025
- Vendor
- Microsoft
- Product
- Windows 10 Version 1507
- Classifications
- CWE-122, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Nov 14, 2023CVE publishedPublication date reported by the CVE source.
- Oct 8, 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=10.0.10240.0 <10.0.10240.20308
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.
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Technologies
Your stack
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Your stack
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