CVE-2021-34491 json
Win32k Information Disclosure Vulnerability
published 2021-07-14 5 y ago modified 2026-08-10 2 mo ago also EUVD-2021-21145
- cvss
- 5.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.0%
- EPSS 1.0% chance of exploitation in 30 days, percentile 61%
- public exploits
- 0
- none known
Summary
Win32k Information Disclosure Vulnerability
Patch / fix
- Microsoft Windows 10 Version 1507 10.0.10240.19003
- Microsoft Windows 10 Version 1607 10.0.14393.4530
- Microsoft Windows 10 Version 1809 10.0.17763.2061
- Microsoft Windows 10 Version 1909 10.0.18363.1679
- Microsoft Windows 10 Version 2004 10.0.19041.1110
- Microsoft Windows 10 Version 20H2 10.0.19042.1110
- Microsoft Windows 10 Version 21H1 10.0.19043.1110
- Microsoft Windows 8.1 6.3.9600.20069
- Microsoft Windows Server 2012 R2 6.3.9600.20069
- Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.20069
- Microsoft Windows Server 2016 10.0.14393.4530
- Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.4530
- Microsoft Windows Server 2019 10.0.17763.2061
- Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.2061
- Microsoft Windows Server version 2004 10.0.19041.1110
- Microsoft Windows Server version 20H2 10.0.19042.1110
Exploit prediction
0.97% chance of exploitation in the next 30 days, higher than 61% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C |
| CNA | 3.1 | 5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
| NVD | 2.0 | 4.9 | AV:L/AC:L/Au:N/C:C/I:N/A:N |
Affected products
- Microsoft Windows 10 Version 1507
- Microsoft Windows 10 Version 1607
- Microsoft Windows 10 Version 1809
- Microsoft Windows 10 Version 1909
- Microsoft Windows 10 Version 2004
- Microsoft Windows 10 Version 20H2
- Microsoft Windows 10 Version 21H1
- Microsoft Windows 8.1
- Microsoft Windows Server 2012 R2
- Microsoft Windows Server 2012 R2 (Server Core installation)
- Microsoft Windows Server 2016
- Microsoft Windows Server 2016 (Server Core installation)
- Microsoft Windows Server 2019
- Microsoft Windows Server 2019 (Server Core installation)
- Microsoft Windows Server version 2004
- Microsoft Windows Server version 20H2
References
-
msrc.microsoft.com
/update-guide/vulnerability/CVE-2021-34491
vendor-advisory, patch
-
portal.msrc.microsoft.com
/en-US/security-guidance/advisory/CVE-2021-34491
patch, vendor-advisory
Sources
- CVE List CVE-2021-34491
- NVD CVE-2021-34491
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.