{"id":"CVE-2024-49138","kind":"vulnerability","aliases":["CVE-2024-49138"],"related":[],"title":"Windows Common Log File System Driver Elevation of Privilege Vulnerability","description":"Microsoft Windows Common Log File System (CLFS) driver contains a heap-based buffer overflow vulnerability that allows a local attacker to escalate privileges.\n\nCISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.","summary":"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.","severity":"high","cvss":7.8,"epss":null,"exploited":true,"exploited_at":"2024-12-10T00:00:00+00:00","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"],"how_to_check":null,"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.","status":"open","published_at":"2024-12-10T00:00:00+00:00","first_seen_at":"2026-10-23T19:11:51+00:00","triaged_at":"2026-10-23T20:56:02+00:00","updated_at":"2026-10-23T22:29:05+00:00","category":"infrastructure","confidence":0.7,"triage":{"at":"2026-10-23T20:56:02Z","model":"claude-haiku-5-5","output":{"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.","reach":"local","impact":"high","summary":"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.","category":"infrastructure","who_cares":["windows","self-hosted"],"confidence":0.7,"needs_auth":"yes","worst_case":"local user gains SYSTEM-level privileges on the Windows machine","analyst_note":"Find the Microsoft Security Response Center advisory for CVE-2024-49138 to confirm affected Windows builds, the patched KB numbers, and any detection guidance.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["unknown"],"user_interaction":"no","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000457,"input_tokens":2836,"output_tokens":346,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2024':12A,15A '-49138':13A,16A '10':21A,25A,29A,33A,37A '11':41A,45A,49A '1507':22A '1607':26A '1809':30A '2008':54A,58A,62A '2012':66A,70A '2016':74A '2019':78A '2022':82A,86A '2025':91A '21h2':34A '22h2':38A,42A '23h2':46A,87A '24h2':50A 'action':153C 'allow':144C 'appli':154C 'attack':147C 'base':101B,139C 'buffer':102B,140C 'cisa':119B,151C 'clfs':111B,133C 'common':2A,107B,129C 'contain':135C 'cve':11A,14A 'discontinu':160C 'driver':6A,112B,134C 'elev':7A 'escal':117B,149C 'exploit':92B,123B 'file':4A,109B,131C 'heap':100B,138C 'heap-bas':99B,137C 'host':96B 'infrastructur':93B 'instruct':158C 'let':113B 'list':120B 'local':115B,146C 'log':3A,108B,130C 'microsoft':17A,19A,23A,27A,31A,35A,39A,43A,47A,51A,55A,59A,63A,67A,71A,75A,79A,83A,88A,127C 'mitig':155C,166C 'overflow':103B,141C 'per':156C 'privileg':9A,118B,150C 'product':164C 'requir':152C 'self':95B 'self-host':94B 'server':53A,57A,61A,65A,69A,73A,77A,81A,85A,90A 'system':5A,110B,132C 'unavail':168C 'use':161C 'user':116B 'vendor':157C 'vulner':10A,142C 'wild':126B 'window':1A,97B,106B,128C 'windows':18A,20A,24A,28A,32A,36A,40A,44A,48A,52A,56A,60A,64A,68A,72A,76A,80A,84A,89A","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2024-12-10T00:00:00+00:00","kev":{"dateAdded":"2024-12-10","dueDate":"2024-12-31","requiredAction":"Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.","knownRansomwareCampaignUse":"Unknown"},"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-2024-49138","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2024-49138","severity":null,"published_at":"2024-12-10T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:51+00:00","fetched_at":"2026-10-25T12:39:22+00:00","note":null},{"source":"nvd","external_id":"CVE-2024-49138","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-49138","severity":null,"published_at":"2024-12-12T02:04:40+00:00","modified_at":"2026-06-17T07:59:29+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"}