{"id":"CVE-2025-29824","kind":"vulnerability","aliases":["CVE-2025-29824"],"related":[],"title":"Use after free in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally","description":"Microsoft Windows Common Log File System (CLFS) Driver contains a use-after-free vulnerability that allows an authorized attacker to elevate privileges locally.\n\nCISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","summary":"A use-after-free bug in the Windows Common Log File System (CLFS) driver lets a logged-in attacker raise their privileges on the machine. CISA lists it as actively exploited, and the tags name ransomware use.","severity":"high","cvss":7.8,"epss":null,"exploited":true,"exploited_at":"2025-04-08T00:00:00+00:00","products":[{"name":"Microsoft Windows","fixed":[],"affected":"","ecosystem":"vendor"},{"name":"microsoft windows 10 1507","fixed":["10.0.10240.20978"],"affected":"< 10.0.10240.20978","ecosystem":"vendor"},{"name":"microsoft windows 10 1607","fixed":["10.0.14393.7969"],"affected":"< 10.0.14393.7969","ecosystem":"vendor"},{"name":"microsoft windows 10 1809","fixed":["10.0.17763.7136"],"affected":"< 10.0.17763.7136","ecosystem":"vendor"},{"name":"microsoft windows 10 21h2","fixed":["10.0.19044.5737"],"affected":"< 10.0.19044.5737","ecosystem":"vendor"},{"name":"microsoft windows 10 22h2","fixed":["10.0.19045.5737"],"affected":"< 10.0.19045.5737","ecosystem":"vendor"},{"name":"microsoft windows 11 22h2","fixed":["10.0.22621.5189"],"affected":"< 10.0.22621.5189","ecosystem":"vendor"},{"name":"microsoft windows 11 23h2","fixed":["10.0.22631.5189"],"affected":"< 10.0.22631.5189","ecosystem":"vendor"},{"name":"microsoft windows 11 24h2","fixed":["10.0.26100.3775"],"affected":"< 10.0.26100.3775","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 2012","fixed":[],"affected":"","ecosystem":"vendor"},{"name":"microsoft windows server 2012","fixed":[],"affected":"= r2","ecosystem":"vendor"},{"name":"microsoft windows server 2016","fixed":["10.0.14393.7969"],"affected":"< 10.0.14393.7969","ecosystem":"vendor"},{"name":"microsoft windows server 2019","fixed":["10.0.17763.7136"],"affected":"< 10.0.17763.7136","ecosystem":"vendor"},{"name":"microsoft windows server 2022","fixed":["10.0.20348.3453"],"affected":"< 10.0.20348.3453","ecosystem":"vendor"},{"name":"microsoft windows server 2022 23h2","fixed":["10.0.25398.1551"],"affected":"< 10.0.25398.1551","ecosystem":"vendor"},{"name":"microsoft windows server 2025","fixed":["10.0.26100.3775"],"affected":"< 10.0.26100.3775","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["exploited","infrastructure","ransomware","windows","windows-server"],"not_affected_if":["unpatched-systems-only-if-already-patched"],"how_to_check":null,"fix":"Apply the Microsoft security update for CVE-2025-29824 (version numbers not given in the sources); follow the vendor mitigation instructions named by CISA.","status":"open","published_at":"2025-04-08T00:00:00+00:00","first_seen_at":"2026-10-23T19:11:51+00:00","triaged_at":"2026-10-23T20:48:50+00:00","updated_at":"2026-10-23T22:29:05+00:00","category":"infrastructure","confidence":0.7,"triage":{"at":"2026-10-23T20:48:50Z","model":"claude-haiku-5-5","output":{"fix":"Apply the Microsoft security update for CVE-2025-29824 (version numbers not given in the sources); follow the vendor mitigation instructions named by CISA.","reach":"local","summary":"A use-after-free bug in the Windows Common Log File System (CLFS) driver lets a logged-in attacker raise their privileges on the machine. CISA lists it as actively exploited, and the tags name ransomware use.","category":"infrastructure","who_cares":["windows","windows-server"],"confidence":0.7,"needs_auth":"yes","worst_case":"local user gains SYSTEM privileges, enabling full control of the Windows machine","analyst_note":"Find the patched Windows build numbers and KB articles for CVE-2025-29824 on the Microsoft Security Update Guide to fill in how_to_check and fix.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["unpatched-systems-only-if-already-patched"],"user_interaction":"no","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000438,"input_tokens":2552,"output_tokens":365,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-01':178C '-2025':20A,23A '-29824':21A,24A '10':29A,33A,37A,41A,45A '11':49A,53A,57A '1507':30A '1607':34A '1809':38A '2008':62A,66A '2012':70A,74A '2016':78A '2019':82A '2022':86A,90A '2025':95A '21h2':42A '22':177C '22h2':46A,50A '23h2':54A,91A '24h2':58A 'action':168C 'activ':134B 'allow':11A,158C 'appli':169C 'applic':175C 'attack':14A,123B,161C 'author':13A,160C 'bod':176C 'bug':108B 'cisa':130B,166C 'clfs':116B,148C 'cloud':181C 'common':6A,112B,144C 'contain':150C 'cve':19A,22A 'discontinu':184C 'driver':10A,117B,149C 'elev':16A,163C 'exploit':96B,135B 'file':8A,114B,146C 'follow':174C 'free':3A,107B,155C 'guidanc':179C 'infrastructur':97B 'instruct':173C 'let':118B 'list':131B 'local':18A,165C 'log':7A,113B,121B,145C 'logged-in':120B 'machin':129B 'microsoft':25A,27A,31A,35A,39A,43A,47A,51A,55A,59A,63A,67A,71A,75A,79A,83A,87A,92A,142C 'mitig':170C,190C 'name':139B 'per':171C 'privileg':17A,126B,164C 'product':188C 'rais':124B 'ransomwar':98B,140B 'requir':167C 'server':61A,65A,69A,73A,77A,81A,85A,89A,94A,102B 'servic':182C 'system':9A,115B,147C 'tag':138B 'unavail':192C 'use':1A,105B,141B,153C,185C 'use-after-fre':104B,152C 'vendor':172C 'vulner':156C 'window':5A,99B,101B,111B,143C 'windows':26A,28A,32A,36A,40A,44A,48A,52A,56A,60A,64A,68A,72A,76A,80A,84A,88A,93A 'windows-serv':100B","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2025-04-08T00:00:00+00:00","kev":{"dateAdded":"2025-04-08","dueDate":"2025-04-29","requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","knownRansomwareCampaignUse":"Known"},"cvss_vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2025-29824","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2025-29824","severity":null,"published_at":"2025-04-08T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:51+00:00","fetched_at":"2026-10-25T11:39:14+00:00","note":null},{"source":"nvd","external_id":"CVE-2025-29824","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-29824","severity":null,"published_at":"2025-04-08T18:16:08+00:00","modified_at":"2026-06-17T09:05:43+00:00","first_seen_at":"2026-10-23T22:29:05+00:00","fetched_at":"2026-10-23T22:29:05+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}