CVE-2021-42286: microsoft windows_10 Improper Privilege Management
CVSS: 7.8v3.1HighModified
Published 10-11-2021Last modified 19-08-2026
Vulnerability summary
CVE-2021-42286 is a high (CVSS 7.8) Improper Privilege Management vulnerability in microsoft windows_10. EPSS estimates a 0.49% chance of exploitation in the next 30 days, higher than 40.8% of scored vulnerabilities.
CVSS score
7.8/10
010
High · v3.1 (CVE.org)EPSS score
0.49%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 10-11-2021PublishedVulnerability first disclosed.
- 19-08-2026Last modifiedVulnerability information updated.
Description
Windows Core Shell SI Host Extension Framework for Composable Shell Elevation of Privilege Vulnerability
CVSS metrics
3 scores · 2 sources · 2 versionsHigh 7.8Preferred score · CVE.org (CNA)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:CSourcesAll 2 agree
- NVDNIST7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Medium 4.6Preferred score · NVD (NIST)
AV:L/AC:L/Au:N/C:P/I:P/A:PSourcesSingle source
EPSS trend
Probability
0.49%
Chance of exploitation in the next 30 days
Percentile
41%
Versus all other CVEs
30-day change
0.00 pp
From 0.48% on 19-09-2026
19-09-202619-10-2026
EPSS score0.49%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Microsoft8 products
- windows_1020h2 | 21h1 | 2004
- windows 10 version 2004≥ 10.0.0, < 10.0.19041.1348
- windows 10 version 20h2≥ 10.0.0, < 10.0.19042.1348
- windows 10 version 21h1≥ 10.0.0, < 10.0.19043.1348
- windows_server20h2
1 vendor · 8 products
References
2 links
- portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42286X Refsource MISCX TransferredPatchVendor Advisory