CVE-2021-34458
Windows Kernel Remote Code Execution Vulnerability
Windows Kernel Remote Code Execution Vulnerability
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Windows Kernel Remote Code Execution Vulnerability
Windows Kernel Remote Code Execution Vulnerability
- Record
CVE-2021-34458- CVSS 3.1
- 9.9 Critical
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C - Updated
- 2026-11-02
EUVDEUVD-2021-21113
Windows Kernel Remote Code Execution Vulnerability
- Record
EUVD-2021-21113- CVSS 3.1
- 9.9 Critical
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-35fh-hcwr-mcv6
Windows Kernel Remote Code Execution Vulnerability This CVE ID is unique from CVE-2021-34508.
Windows Kernel Remote Code Execution Vulnerability This CVE ID is unique from CVE-2021-34508.
- Record
GHSA-35fh-hcwr-mcv6- CVSS 3.1
- 9.9 Critical
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H - Updated
- 2026-11-02
NVD
Windows Kernel Remote Code Execution Vulnerability
- Record
CVE-2021-34458- CVSS 3.1
- 9.9 Critical
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H - CVSS 2.0
- 9.0 High
AV:N/AC:L/Au:S/C:C/I:C/A:C - Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-34458 is a critical vulnerability (CVSS 9.9) in Microsoft Windows Server 2016, published July 16, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.62%, the 85th percentile. No source names a fixed version.