ClosedPatched

Microsoft Windows: 2 exploited vulnerabilities (CVE-2023-21823, CVE-2023-23376)

Microsoft Windows

Microsoft Windows Graphic Component contains an unspecified vulnerability that allows for privilege escalation. Microsoft Windows Common Log File System (CLFS) driver contains an unspecified vulnerability that allows for privilege escalation. Added to CISA KEV on 2023-02-14. CISA lists known use in ransomware campaigns.

Why this severity: CVSS 7.8 (NVD), actively exploited (CISA KEV), known ransomware use

Started: Feb 14, 2023
Closed: Feb 14, 2023
CVEs: CVE-2023-21823 CVE-2023-23376

Follow this incident

Updated Feb 14, 2023

Affected

See vendor advisory / CISA notes (versions not always listed in KEV feed)

Fixed in

See vendor advisory linked in sources

Timeline2

Feb 14, 2023
CISA added CVE-2023-21823 to the KEV catalog (due 2023-03-07).
Feb 14, 2023
CISA added CVE-2023-23376 to the KEV catalog (due 2023-03-07).

Advisories5

Notes & caveats

Derived from CISA KEV JSON feed catalogVersion 2026.10.21. Exact affected/fixed version strings are not always in the KEV record — verify against the vendor advisory URL. startedAt uses dateAdded (exploitation may have begun earlier). Grouped: same vendor/product added to KEV on the same day.

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