How severe is CVE-2021-41357?

CVE-2021-41357 has a CVSS 3.1 base score of 7.8 (HIGH). EPSS estimates a 1.6% probability of exploitation in the next 30 days. It is listed in the CISA Known Exploited Vulnerabilities catalog.

CVE-2021-41357: Win32k Elevation of Privilege

CISA Known Exploited Vulnerabilities

Microsoft Win32k Privilege Escalation Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.

Added to KEV

2022-04-25

Remediation due

2022-05-16

Required action
Apply updates per vendor instructions.

CISA notes
https://nvd.nist.gov/vuln/detail/CVE-2021-41357

Description

Win32k Elevation of Privilege Vulnerability

Severity

CVSS 3.1 · CNA7.8 HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C

SSVC · CISA-ADP

Exploitationactive

Automatableno

Technical impacttotal

Affected Products

Vendor	Product	Affected versions
Microsoft	Windows 10 Version 21H1	10.0.0 to <10.0.19043.1288
Microsoft	Windows Server 2022	10.0.0 to <10.0.20348.288
Microsoft	Windows 10 Version 2004	10.0.0 to <10.0.19041.1288
Microsoft	Windows Server version 2004	10.0.0 to <10.0.19041.1288
Microsoft	Windows 10 Version 20H2	10.0.0 to <10.0.19042.1288
Microsoft	Windows Server version 20H2	10.0.0 to <10.0.19042.1288
Microsoft	Windows 11 version 21H2	10.0.0 to <10.0.22000.258

References

1 Links

Other references

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-41357

Record Details

Published

2021-10-13

Last updated

2025-10-21

Assigner (CNA)

microsoft

Credited to

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CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). This site is not endorsed or certified by MITRE, NVD, CISA, or FIRST.