---
id: "CVE-2024-49138"
kind: "vulnerability"
aliases: ["CVE-2024-49138"]
title: "Windows Common Log File System Driver Elevation of Privilege Vulnerability"
severity: "high"
cvss: 7.8
epss: null
exploited: true
status: "open"
category: "infrastructure"
products: [{"name": "Microsoft Windows", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "microsoft windows 10 1507", "fixed": ["10.0.10240.20857"], "affected": "< 10.0.10240.20857", "ecosystem": "vendor"}, {"name": "microsoft windows 10 1607", "fixed": ["10.0.14393.7606"], "affected": "< 10.0.14393.7606", "ecosystem": "vendor"}, {"name": "microsoft windows 10 1809", "fixed": ["10.0.17763.6659"], "affected": "< 10.0.17763.6659", "ecosystem": "vendor"}, {"name": "microsoft windows 10 21h2", "fixed": ["10.0.19044.5247"], "affected": "< 10.0.19044.5247", "ecosystem": "vendor"}, {"name": "microsoft windows 10 22h2", "fixed": ["10.0.19045.5247"], "affected": "< 10.0.19045.5247", "ecosystem": "vendor"}, {"name": "microsoft windows 11 22h2", "fixed": ["10.0.22621.4602"], "affected": "< 10.0.22621.4602", "ecosystem": "vendor"}, {"name": "microsoft windows 11 23h2", "fixed": ["10.0.22631.4602"], "affected": "< 10.0.22631.4602", "ecosystem": "vendor"}, {"name": "microsoft windows 11 24h2", "fixed": ["10.0.26100.2605"], "affected": "< 10.0.26100.2605", "ecosystem": "vendor"}, {"name": "microsoft windows server 2008", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "microsoft windows server 2008", "fixed": [], "affected": "= r2", "ecosystem": "vendor"}, {"name": "microsoft windows server 2008", "fixed": [], "affected": "= sp2", "ecosystem": "vendor"}, {"name": "microsoft windows server 2012", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "microsoft windows server 2012", "fixed": [], "affected": "= r2", "ecosystem": "vendor"}, {"name": "microsoft windows server 2016", "fixed": ["10.0.14393.7606"], "affected": "< 10.0.14393.7606", "ecosystem": "vendor"}, {"name": "microsoft windows server 2019", "fixed": ["10.0.17763.6659"], "affected": "< 10.0.17763.6659", "ecosystem": "vendor"}, {"name": "microsoft windows server 2022", "fixed": ["10.0.20348.2966"], "affected": "< 10.0.20348.2966", "ecosystem": "vendor"}, {"name": "microsoft windows server 2022 23h2", "fixed": ["10.0.25398.1308"], "affected": "< 10.0.25398.1308", "ecosystem": "vendor"}, {"name": "microsoft windows server 2025", "fixed": ["10.0.26100.2605"], "affected": "< 10.0.26100.2605", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["exploited", "infrastructure", "self-hosted", "windows"]
not_affected_if: ["unknown"]
published_at: "2024-12-10T00:00:00+00:00"
first_seen_at: "2026-10-23T19:11:51+00:00"
updated_at: "2026-10-23T22:29:05+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2024-49138", "first_seen_at": "2026-10-23T19:11:51+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-49138", "first_seen_at": "2026-10-23T22:29:05+00:00"}]
---

# Windows Common Log File System Driver Elevation of Privilege Vulnerability

A heap-based buffer overflow in the Windows Common Log File System (CLFS) driver lets a local user escalate privileges. CISA lists it as exploited in the wild.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:Microsoft Windows affected ? fixed ?
- vendor:microsoft windows 10 1507 affected < 10.0.10240.20857 fixed 10.0.10240.20857
- vendor:microsoft windows 10 1607 affected < 10.0.14393.7606 fixed 10.0.14393.7606
- vendor:microsoft windows 10 1809 affected < 10.0.17763.6659 fixed 10.0.17763.6659
- vendor:microsoft windows 10 21h2 affected < 10.0.19044.5247 fixed 10.0.19044.5247
- vendor:microsoft windows 10 22h2 affected < 10.0.19045.5247 fixed 10.0.19045.5247
- vendor:microsoft windows 11 22h2 affected < 10.0.22621.4602 fixed 10.0.22621.4602
- vendor:microsoft windows 11 23h2 affected < 10.0.22631.4602 fixed 10.0.22631.4602
- vendor:microsoft windows 11 24h2 affected < 10.0.26100.2605 fixed 10.0.26100.2605
- vendor:microsoft windows server 2008 affected ? fixed ?
- vendor:microsoft windows server 2008 affected = r2 fixed ?
- vendor:microsoft windows server 2008 affected = sp2 fixed ?
- vendor:microsoft windows server 2012 affected ? fixed ?
- vendor:microsoft windows server 2012 affected = r2 fixed ?
- vendor:microsoft windows server 2016 affected < 10.0.14393.7606 fixed 10.0.14393.7606
- vendor:microsoft windows server 2019 affected < 10.0.17763.6659 fixed 10.0.17763.6659
- vendor:microsoft windows server 2022 affected < 10.0.20348.2966 fixed 10.0.20348.2966
- vendor:microsoft windows server 2022 23h2 affected < 10.0.25398.1308 fixed 10.0.25398.1308
- vendor:microsoft windows server 2025 affected < 10.0.26100.2605 fixed 10.0.26100.2605

## Fix

Apply the Microsoft security update for CVE-2024-49138 per vendor instructions; if no mitigation is available, discontinue use of the affected product per CISA's required action.

## Timeline

- 2026-10-23T19:11:51+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2024-49138
- 2026-10-23T22:29:05+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2024-49138

## From the sources

Microsoft Windows Common Log File System (CLFS) driver contains a heap-based buffer overflow vulnerability that allows a local attacker to escalate privileges.

CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_