Kernel-memory disclosure to local users
Published Jun 8, 2021 · Updated Oct 21, 2025
Information disclosure in the Windows kernel allows local users on affected Windows 10 and Server releases to read kernel memory. Microsoft has not disclosed the specific kernel component or faulty operation; CISA states that exploitation exposes kernel-memory contents to a user-mode process. Exploitation requires local low-privileged code execution, and the documented consequence is memory disclosure without data modification or service interruption.
Summary
What happened
Information disclosure in the Windows kernel allows local users on affected Windows 10 and Server releases to read kernel memory. Microsoft has not disclosed the specific kernel component or faulty operation; CISA states that exploitation exposes kernel-memory contents to a user-mode process. Exploitation requires local low-privileged code execution, and the documented consequence is memory disclosure without data modification or service interruption.
The record
- CVE
- CVE-2021-31955
- Published
- Jun 8, 2021
- Updated
- Oct 21, 2025
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-497
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 8, 2021CVE 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=10.0.0 <10.0.17763.1999
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.
Reported exploitation
- CISA Known Exploited Vulnerabilities Catalog listingknown exploited catalog
Technologies
Your stack
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Your stack
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