Kernel memory disclosure via registry buffer over-read
Published Sep 12, 2023 · Updated Oct 30, 2025
Buffer over-read in the Windows kernel allows local users on affected Windows builds to disclose paged-pool memory through registry operations. VrpUpdateKeyInformation reads beyond a registry-virtualization buffer and returns adjacent paged-pool contents to user mode. Exploitation requires low-privilege local access and affects confidentiality only, without reported code execution or service interruption.
Summary
What happened
Buffer over-read in the Windows kernel allows local users on affected Windows builds to disclose paged-pool memory through registry operations. VrpUpdateKeyInformation reads beyond a registry-virtualization buffer and returns adjacent paged-pool contents to user mode. Exploitation requires low-privilege local access and affects confidentiality only, without reported code execution or service interruption.
The record
- CVE
- CVE-2023-36803
- Published
- Sep 12, 2023
- Updated
- Oct 30, 2025
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-125, CWE-126, T1005
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 12, 2023CVE publishedPublication date reported by the CVE source.
- Oct 30, 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=10.0.17763.0 <10.0.17763.4851
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
- Project Zero issue 42451609 technical reportproof of concept · demonstrated
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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