Local privilege escalation through undisclosed RDBSS flaw
Published Sep 15, 2021 · Updated Aug 10, 2026
Elevation of privilege in Microsoft Windows RDBSS allows local users with low privileges to gain elevated privileges. The RDBSS kernel-mode file-system driver handles redirected-drive buffering, but Microsoft has not published the precise flawed operation or attacker-controlled input. Exploitation requires local low-privileged access and can compromise confidentiality, integrity, and availability.
Summary
What happened
Elevation of privilege in Microsoft Windows RDBSS allows local users with low privileges to gain elevated privileges. The RDBSS kernel-mode file-system driver handles redirected-drive buffering, but Microsoft has not published the precise flawed operation or attacker-controlled input. Exploitation requires local low-privileged access and can compromise confidentiality, integrity, and availability.
The record
- CVE
- CVE-2021-36973
- 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?
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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