CVE-2021-34458
CRITICALCVSS 9.9/10EPSS 2.50%
Last modified
CVE-2021-34458 is a critical-severity vulnerability rated 9.9/10 on the CVSS scale. Windows Kernel Remote Code Execution Vulnerability. EPSS estimates a 2.50% chance of exploitation in the next 30 days.
Description
Windows Kernel Remote Code Execution Vulnerability
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Windows Server 2016 | All versions |
| Microsoft | Windows Server 2016 | 20h2 |
| Microsoft | Windows Server 2016 | 2004 |
| Microsoft | Windows Server 2019 | All versions |
References
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-34458?
Windows Kernel Remote Code Execution Vulnerability
How severe is CVE-2021-34458?
CVE-2021-34458 has a CVSS score of 9.9/10 (CRITICAL severity). The EPSS model estimates a 2.50% probability of exploitation in the next 30 days.
How do I fix CVE-2021-34458?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2021
- CVE-2021-34452Microsoft Word Remote Code Execution Vulnerability7.8
- CVE-2021-34453Microsoft Exchange Server Denial of Service Vulnerability7.5
- CVE-2021-34454Windows Remote Access Connection Manager Information Disclos…5.5
- CVE-2021-34455Windows File History Service Elevation of Privilege Vulnerab…7.8
- CVE-2021-34456Windows Remote Access Connection Manager Elevation of Privil…7.8
- CVE-2021-34457Windows Remote Access Connection Manager Information Disclos…5.5
- CVE-2021-34459Windows AppContainer Elevation Of Privilege Vulnerability7.8
- CVE-2021-3446A flaw was found in libtpms in versions before 0.8.2. The co…5.5
- CVE-2021-34460Windows Storage Spaces Controller Elevation of Privilege Vul…7.8
- CVE-2021-34461Windows Container Isolation FS Filter Driver Elevation of Pr…7.8
- CVE-2021-34462Windows AppX Deployment Extensions Elevation of Privilege Vu…7
- CVE-2021-34464Microsoft Defender Remote Code Execution Vulnerability7.8
Are you affected by CVE-2021-34458?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST