CVE-2021-43893
Windows Encrypting File System (EFS) Elevation of Privilege Vulnerability
HIGH
7.5
CVSS Score
Published: December 15, 2021 at 02:15 PM UTC
Updated: June 17, 2026 at 04:11 AM UTC
22 products affected across 1 vendorWindows Server 2016Windows Server 2019Windows Server 2012
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Severity
HIGH7.5
Exploit prediction
EPSS 7%
Description
Windows Encrypting File System (EFS) Elevation of Privilege Vulnerability
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
Affected range stops below 10.0.10240.19145, so it looks safe — our inference, not a vendor statement
Affected range stops below 10.0.14393.4825, so it looks safe — our inference, not a vendor statement
Affected range stops below 10.0.17763.2366, so it looks safe — our inference, not a vendor statement
Affected range stops below 10.0.18363.1977, so it looks safe — our inference, not a vendor statement
All versions
Affected range stops below 6.1.7601.25796, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.3.9600.20207, so it looks safe — our inference, not a vendor statement
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
References (2)
x_refsource_MISCThird Party AdvisoryVDB Entry
Source: [email protected]
http://packetstormsecurity.com/files/165560/Microsoft-Windows-EFSRPC-Arbitrary-File-Upload-Privilege-Escalation.htmlx_refsource_MISCPatchVendor Advisory
Source: [email protected]
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-43893CVSS
7.5HIGHmicrosoft
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-668
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