SYSTEM privilege escalation via unchecked heap copy
Published Nov 14, 2023 · Updated Oct 21, 2025
Heap-based buffer overflow in Microsoft Windows Cloud Files Mini Filter Driver allows local users to elevate privileges to SYSTEM. The cldflt.sys mini-filter fails to validate attacker-controlled buffer lengths before an out-of-bounds copy into paged-pool heap memory. Low-privileged local code execution is required; successful exploitation corrupts kernel memory and executes code with SYSTEM privileges.
Summary
What happened
Heap-based buffer overflow in Microsoft Windows Cloud Files Mini Filter Driver allows local users to elevate privileges to SYSTEM. The cldflt.sys mini-filter fails to validate attacker-controlled buffer lengths before an out-of-bounds copy into paged-pool heap memory. Low-privileged local code execution is required; successful exploitation corrupts kernel memory and executes code with SYSTEM privileges.
The record
- CVE
- CVE-2023-36036
- Published
- Nov 14, 2023
- Updated
- Oct 21, 2025
- Vendor
- Microsoft
- Product
- Windows 10 Version 1507
- Classifications
- CWE-787, CWE-122, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Nov 14, 2023Exploitation reportedCISA Known Exploited Vulnerabilities catalog entry
- Nov 14, 2023CVE publishedPublication date reported by the CVE source.
- Oct 21, 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
- Microsoft Windows Cloud Files Privilege Escalation Exploitweaponized · validated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Reported exploitation
- CISA Known Exploited Vulnerabilities catalog entryknown exploited catalog
Technologies
Your stack
See the directory against your own environment.
Your stack
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