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CVE-2021-41357

Win32k Elevation of Privilege Vulnerability

HIGH
7.8
CVSS Score
Published: October 13, 2021 at 12:28 AM UTC
Updated: June 17, 2026 at 04:08 AM UTC
8 products affected across 1 vendorWindows 10 1809Windows Server 2022Windows 11 21H2

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Severity
HIGH7.8
Exploitation
CISA KEV
Exploit prediction
EPSS 2%
SSVC
Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score1.6%

EPSS (Exploit Prediction Scoring System) estimates a 1.6% chance this CVE is exploited in the wild within the next 30 days — higher than 75% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

Microsoft Win32k contains an unspecified vulnerability that allows for privilege escalation.

Required Action
Apply updates per vendor instructions.
Ransomware Use
Unknown
Added to KEV
Apr 25, 2022
Remediation Due
May 16, 2022
1626 days overdue
Notes
https://nvd.nist.gov/vuln/detail/CVE-2021-41357

Description

Win32k Elevation of Privilege Vulnerability

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Windows 10 1809· Microsoft
95%
10.0.19041.1288
Windows 10 2004· Microsoft
95%
v < 10.0.19041.128810.0.0 ≤ v < 10.0.19041.128810.0.0
Affected range stops below 10.0.19041.1288, so it looks safe — our inference, not a vendor statement
Windows 10 20H2· Microsoft
95%
v < 10.0.19042.128810.0.0 ≤ v < 10.0.19042.128810.0.0
Affected range stops below 10.0.19042.1288, so it looks safe — our inference, not a vendor statement
Windows 10 21H1· Microsoft
95%
v < 10.0.19043.128810.0.0 ≤ v < 10.0.19043.128810.0.0
Affected range stops below 10.0.19043.1288, so it looks safe — our inference, not a vendor statement
Windows 11 21H2· Microsoft
95%
v < 10.0.22000.25810.0.0 ≤ v < 10.0.22000.25810.0.0
Affected range stops below 10.0.22000.258, so it looks safe — our inference, not a vendor statement
Windows Server 2004· Microsoft
95%
v < 10.0.19041.128810.0.0 ≤ v < 10.0.19041.128810.0.010.0.19041.1288
Affected range stops below 10.0.19041.1288, so it looks safe — our inference, not a vendor statement
Windows Server 2022· Microsoft
95%
v < 10.0.20348.28810.0.0 ≤ v < 10.0.20348.28810.0.010.0.20348.288
Affected range stops below 10.0.20348.288, so it looks safe — our inference, not a vendor statement
Windows Server 20H2· Microsoft
95%
v < 10.0.19042.128810.0.0 ≤ v < 10.0.19042.128810.0.0
Affected range stops below 10.0.19042.1288, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

x_refsource_MISCPatchVendor Advisory
Source: [email protected]
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-41357
US Government Resource
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-41357

SSVC — Action Prioritization

SSVCActiveNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGHmicrosoft
Vector?

Quick Info

StatusANALYZED
CWE
NVD-CWE-noinfo

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