# Microsoft Windows: 2 exploited vulnerabilities (CVE-2023-21823, CVE-2023-23376) · pwn.watch

> 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.

Page: https://pwn.watch/i/microsoft-windows-cve-2023-21823-23376 · generated 2026-10-23T03:54:42.456Z

## Status
- Severity: high · status: closed · patch: patched
- Product: Microsoft Windows
- Started: 2023-02-14 · closed: 2023-02-14
- CVEs: CVE-2023-21823, CVE-2023-23376
- Affected: See vendor advisory / CISA notes (versions not always listed in KEV feed)
- Fixed in: See vendor advisory linked in sources

## Follow this incident
- RSS (one item per update): https://pwn.watch/i/microsoft-windows-cve-2023-21823-23376/feed.xml
- JSON Feed: https://pwn.watch/i/microsoft-windows-cve-2023-21823-23376/feed.json
- Full data (timeline, sources, posts, agentBrief): https://pwn.watch/i/microsoft-windows-cve-2023-21823-23376.json
- This file: https://pwn.watch/i/microsoft-windows-cve-2023-21823-23376/llms.txt

## Updates (newest first)
- 2023-02-14: CISA added CVE-2023-21823 to the KEV catalog (due 2023-03-07).
- 2023-02-14: CISA added CVE-2023-23376 to the KEV catalog (due 2023-03-07).

## Fix brief
# Security brief: Microsoft Windows: 2 exploited vulnerabilities (CVE-2023-21823, CVE-2023-23376)

Source: https://pwn.watch/i/microsoft-windows-cve-2023-21823-23376 · status: closed (closed Feb 14, 2023) · severity: high · updated Feb 14, 2023

## Patch status
**PATCHED: fixed releases exist. Upgrade to a fixed version.**

## What it is
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.

Severity detail: CVSS 7.8 (NVD), actively exploited (CISA KEV), known ransomware use

- Product: Microsoft Windows
- CVE / advisory ids: CVE-2023-21823, CVE-2023-23376

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

## Check whether you're affected
No generic command applies (the product is a hosted service, appliance or desktop app). Check the installed version in its admin UI / About screen and compare with the versions above.

## Fix
Upgrade to one of these fixed versions (or later on the same branch):
- See vendor advisory linked in sources

After upgrading, re-run the checks above and redeploy/restart the affected services.

## Latest updates
- 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).

## Advisories
- [Vendor advisory: Microsoft Windows](https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2023-21823) (Microsoft)
- [NVD: CVE-2023-21823](https://nvd.nist.gov/vuln/detail/CVE-2023-21823) (NVD)
- [Vendor advisory: Microsoft Windows](https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2023-23376) (Microsoft)
- [NVD: CVE-2023-23376](https://nvd.nist.gov/vuln/detail/CVE-2023-23376) (NVD)
- [CISA Known Exploited Vulnerabilities Catalog](https://www.cisa.gov/known-exploited-vulnerabilities-catalog) (CISA)

## 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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Machine-readable: https://pwn.watch/i/microsoft-windows-cve-2023-21823-23376.json · all incidents: https://pwn.watch/incidents.json. Verify against the vendor advisory before changing production systems.