Local privilege escalation through undisclosed spooler flaw
Published Sep 15, 2021 · Updated Aug 10, 2026
Elevation of privilege in Microsoft Windows Print Spooler allows local users with low privileges to gain higher system privileges. Microsoft has not disclosed the affected function, data path, or incorrect operation within the spooler service. Exploitation requires local low-privilege access and can compromise confidentiality, integrity, and availability at the elevated privilege level.
Summary
What happened
Elevation of privilege in Microsoft Windows Print Spooler allows local users with low privileges to gain higher system privileges. Microsoft has not disclosed the affected function, data path, or incorrect operation within the spooler service. Exploitation requires local low-privilege access and can compromise confidentiality, integrity, and availability at the elevated privilege level.
The record
- CVE
- CVE-2021-40447
- Published
- Sep 15, 2021
- Updated
- Aug 10, 2026
- Vendor
- Microsoft
- Product
- Windows 10 Version 1507
- Classifications
- CWE-269, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 15, 2021CVE 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=10.0.10240.0 <10.0.10240.19060
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.
Technologies
Your stack
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Your stack
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