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6.5

Windows Key Storage Vulnerability Allows Unauthorized Access

CVE-2021-38624 · published 5 years ago
Summary

A vulnerability in Windows Key Storage allows an attacker to bypass security features and access encrypted data. This could lead to unauthorized access to sensitive information. To mitigate this risk, ensure Windows is up to date with the latest security patches.

What to do
  • Update microsoft windows 10 version 1809 to version 10.0.17763.2237 or later.
  • Update microsoft windows 10 version 1909 to version 10.0.18363.1854 or later.
  • Update microsoft windows 10 version 2004 to version 10.0.19041.1288 or later.
  • Update microsoft windows 10 version 20h2 to version 10.0.19042.1288 or later.
  • Update microsoft windows 10 version 21h1 to version 10.0.19043.1288 or later.
  • Update microsoft windows 11 version 21h2 to version 10.0.22000.258 or later.
  • Update microsoft windows server 2019 to version 10.0.17763.2237 or later.
  • Update microsoft windows server 2019 (server core installation) to version 10.0.17763.2237 or later.
  • Update microsoft windows server 2022 to version 10.0.20348.288 or later.
  • Update microsoft windows server version 2004 to version 10.0.19041.1288 or later.
  • Update microsoft windows server version 20h2 to version 10.0.19042.1288 or later.
Affected software
VendorProductAffected versions
microsoft windows 10 version 1809 < 10.0.17763.2237
microsoft windows 10 version 1909 < 10.0.18363.1854
microsoft windows 10 version 2004 < 10.0.19041.1288
microsoft windows 10 version 20h2 < 10.0.19042.1288
microsoft windows 10 version 21h1 < 10.0.19043.1288
microsoft windows 11 version 21h2 < 10.0.22000.258
microsoft windows server 2019 < 10.0.17763.2237
microsoft windows server 2019 (server core installation) < 10.0.17763.2237
microsoft windows server 2022 < 10.0.20348.288
microsoft windows server version 2004 < 10.0.19041.1288
microsoft windows server version 20h2 < 10.0.19042.1288
microsoft windows_10 20h2
21h1
1809
1909
2004
cpe:2.3:o:microsoft:windows_10:20h2:*:*:*:*:*:*:*
microsoft windows_server_2016 20h2
2004
cpe:2.3:o:microsoft:windows_server_2016:20h2:*:*:*:*:*:*:*
microsoft windows_server_2019 All versions
cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:*
microsoft windows_server_2022 All versions
cpe:2.3:o:microsoft:windows_server_2022:-:*:*:*:*:*:*:*
Original advisory text
Windows Key Storage Provider Security Feature Bypass Vulnerability
Windows Key Storage Provider Security Feature Bypass Vulnerability
References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit (estimated)
  • Gives an attacker partial control (estimated)
Severity
6.5 Medium
Exploitation
2% chance of attack within 30 days
Type
CWE-639Authorization Bypass Through User-Controlled Key
Timeline
Published15 Sep 2021
Updated3 Nov 2026
First seen10 Aug 2026
Sources
CVE-2021-38624 · NVD
CVE-2021-38624 · MITRE
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