7.8

CVE-2021-41357: Microsoft Win32k Privilege Escalation Vulnerability

CVSS: 7.8v3.1HighKEVAnalyzed
Published 13-10-2021Last modified 21-10-2025
Open JSON

Vulnerability summary

CVE-2021-41357 is a high (CVSS 7.8) vulnerability in Microsoft Win32k. It is known to be exploited: CISA lists it, first on 25-04-2022. EPSS estimates a 1.58% chance of exploitation in the next 30 days, higher than 75.1% of scored vulnerabilities.

Overall risk
85/100
0100
Critical · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
1.58%
0%100%
Low · -0.49 pp in 30 days
KEVListedCISA
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 13-10-2021
    PublishedVulnerability first disclosed.
  2. 25-04-2022
    Added to CISA KEVMicrosoft Win32k Privilege Escalation Vulnerability
  3. 16-05-2022
    CISA remediation dueApply updates per vendor instructions.
  4. 21-10-2025
    Last modifiedVulnerability information updated.

Description

Win32k Elevation of Privilege Vulnerability

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

1.58%

Chance of exploitation in the next 30 days

Percentile

75%

Versus all other CVEs

30-day change

-0.49 pp

From 2.08% on 19-09-2026

19-09-202619-10-2026
EPSS score
1.58%

Known exploited

Compare KEV catalogs
CISA KEVListed
Added
25-04-2022
Federal due date
16-05-2022

CISA required action

Apply updates per vendor instructions. nvd.nist.gov/vuln/detail/CVE-2021-41357

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Microsoft13 products

1 vendor · 13 products

References

2 links