CVE-2021-43217
CRITICALCVSS 9.8/10EPSS 6.42%
Last modified
CVE-2021-43217 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Windows Encrypting File System (EFS) Remote Code Execution Vulnerability. EPSS estimates a 6.42% chance of exploitation in the next 30 days.
Description
Windows Encrypting File System (EFS) Remote Code Execution Vulnerability
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Microsoft | Windows 10 | All versions | — |
| Microsoft | Windows 10 | 20h2 | — |
| Microsoft | Windows 10 | 21h1 | — |
| Microsoft | Windows 10 | 1607 | — |
| Microsoft | Windows 10 | 1809 | — |
| Microsoft | Windows 10 | 1909 | — |
| Microsoft | Windows 10 | 2004 | — |
| Microsoft | Windows 11 | All versions | — |
| Microsoft | Windows 7 | All versions | Sp1 |
| Microsoft | Windows 8.1 | All versions | — |
| Microsoft | Windows Rt 8.1 | All versions | — |
| Microsoft | Windows Server | 20h2 | — |
| Microsoft | Windows Server | 2022 | — |
| Microsoft | Windows Server 2008 | All versions | Sp2 |
| Microsoft | Windows Server 2008 | r2 | Sp1 |
| Microsoft | Windows Server 2012 | All versions | — |
| Microsoft | Windows Server 2012 | r2 | — |
| Microsoft | Windows Server 2016 | All versions | — |
| Microsoft | Windows Server 2016 | 2004 | — |
| Microsoft | Windows Server 2019 | All versions | — |
References
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-43217Patch, Vendor Advisory
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-43217Patch, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-43217?
Windows Encrypting File System (EFS) Remote Code Execution Vulnerability
How severe is CVE-2021-43217?
CVE-2021-43217 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 6.42% probability of exploitation in the next 30 days.
How do I fix CVE-2021-43217?
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.
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Are you affected by CVE-2021-43217?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST