CVE-2021-43226
Microsoft Windows Server 2008 r2
Raw vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HSummary
CVE-2021-43226 is a high-severity an unspecified weakness vulnerability in Microsoft Windows Server 2008. Its CVSS base score is 7.8 (High).
Operationally, ranked in the top 14% of CVEs by exploit likelihood; CISA has added it to the Known Exploited Vulnerabilities catalog.
Deeper analysis AI-assisted summary
Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.
The vulnerability is an elevation of privilege flaw in the Windows Common Log File System Driver, assigned CVE-2021-43226 with a CVSS 3.1 base score of 7.8. It affects the Windows operating system component responsible for handling common log file system operations.
An attacker with local access and low privileges can exploit the issue without user interaction to obtain high impacts on confidentiality, integrity, and availability, enabling privilege escalation on the affected system.
Microsoft has published security guidance addressing the vulnerability through its advisory portal, and the flaw appears in CISA's catalog of known exploited vulnerabilities, indicating confirmed real-world exploitation activity.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2021-30170
Vulnerability Data
Windows Common Log File System Driver Elevation of Privilege Vulnerability
- CWE(s)
- KEV Date Added
- 06 October 2025
Related Threats
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Affected Assets
Mitigating Controls
No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.