CRITICAL 9.9 Microsoft

CVE-2021-34458

Windows Kernel Remote Code Execution Vulnerability

Microsoft Security Update 2021-Jul: Windows Kernel Remote Code Execution Vulnerability

Affected Products

Windows Server 2019
Windows Server 2019 (Server Core installation)
Windows Server, version 2004 (Server Core installation)
Windows Server, version 20H2 (Server Core Installation)
Windows Server 2016
Windows Server 2016 (Server Core installation)

References

Published: 2021-07-13 · Source: Microsoft · Feed updated: 2026-08-10

This critical severity vulnerability with a CVSS score of 9.9 was published on 2021-07-13 via Microsoft. Affected: Windows Server 2019, Windows Server 2019 (Server Core installation), Windows Server, version 2004 (Server Core installation) and 3 more.

Risk Timeline

CVE Disclosed2021-07-13 · 1853 days ago

Remediation Resources

Official Advisory

msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34458

NVD / MITRE

nvd.nist.gov/vuln/detail/CVE-2021-34458

Related Vulnerabilities

CVE	Title	Severity	CVSS
CVE-2021-26424	Windows TCP/IP Remote Code Execution Vulnerability	CRITICAL	9.9
CVE-2026-57092	Microsoft Windows VMSwitch Elevation of Privilege Vulnerability	CRITICAL	9.9
CVE-2021-26432	Windows Services for NFS ONCRPC XDR Driver Remote Code Execution Vulnerability	CRITICAL	9.8
CVE-2023-36910	Microsoft Message Queuing (MSMQ) Remote Code Execution Vulnerability	CRITICAL	9.8
CVE-2023-36911	Microsoft Message Queuing (MSMQ) Remote Code Execution Vulnerability	CRITICAL	9.8
CVE-2023-35385	Microsoft Message Queuing (MSMQ) Remote Code Execution Vulnerability	CRITICAL	9.8

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