SYSTEM elevation via unchecked reparse bitmap copy
Published Jun 11, 2024 · Updated Aug 10, 2026
Heap-based buffer overflow in Microsoft Windows allows local users to execute code as SYSTEM through the Cloud Files Mini Filter Driver. HsmIBitmapNORMALOpen skips the 0x1000-byte bitmap-length check when a reparse-point flag is false, then copies an attacker-controlled length into a fixed-size heap buffer. Exploitation requires low-privileged code execution and manipulation of a Cloud Files reparse point; success grants SYSTEM code execution.
Summary
What happened
Heap-based buffer overflow in Microsoft Windows allows local users to execute code as SYSTEM through the Cloud Files Mini Filter Driver. HsmIBitmapNORMALOpen skips the 0x1000-byte bitmap-length check when a reparse-point flag is false, then copies an attacker-controlled length into a fixed-size heap buffer. Exploitation requires low-privileged code execution and manipulation of a Cloud Files reparse point; success grants SYSTEM code execution.
The record
- CVE
- CVE-2024-30085
- Published
- Jun 11, 2024
- Updated
- Aug 10, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-122, CAPEC-92, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 11, 2024CVE publishedPublication date reported by the CVE source.
- Aug 10, 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 <10.0.17763.5936
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
- cldflt heap-based overflow exploitfunctional · demonstrated
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Technologies
Your stack
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Your stack
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