CVE-2021-34516

Win32k Elevation of Privilege Vulnerability

7.8 High

Win32k Elevation of Privilege Vulnerability

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: Low
Privileges needed: Low
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

1.30%Up 0.9 points since Jul 15, 2021

What each source reports

CVE List Score used 7.8

Win32k Elevation of Privilege Vulnerability

Win32k Elevation of Privilege Vulnerability

Record: CVE-2021-34516
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Updated: 2026-11-02

EUVDEUVD-2021-21170 7.8

Win32k Elevation of Privilege Vulnerability

Record: EUVD-2021-21170
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Updated: 2026-11-02

GitHub AdvisoriesGHSA-f679-g5v6-6qqr 7.8

Win32k Elevation of Privilege Vulnerability This CVE ID is unique from CVE-2021-34449.

Win32k Elevation of Privilege Vulnerability This CVE ID is unique from CVE-2021-34449.

Record: GHSA-f679-g5v6-6qqr
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-20, CWE-269
Updated: 2026-11-02

NVD 7.8

Win32k Elevation of Privilege Vulnerability

Record: CVE-2021-34516
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0: 4.6 MediumAV:L/AC:L/Au:N/C:P/I:P/A:P
Weakness: CWE-20
Updated: 2026-11-02

Affected products

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History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-34516 is a high vulnerability (CVSS 7.8) in Microsoft Windows 10 Version 1507, published July 14, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.30%, the 70th percentile. No source names a fixed version.

References

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