{"id":"CVE-2023-36424","kind":"vulnerability","aliases":["CVE-2023-36424"],"related":[],"title":"Windows Common Log File System Driver Elevation of Privilege Vulnerability","description":"Microsoft Windows Common Log File System Driver contains an out-of-bounds read vulnerability that could allow a threat actor for privileges escalation\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":"The Windows Common Log File System (CLFS) driver reads memory past the end of a buffer. A local attacker who can run code on the machine can use this to escalate to higher privileges.","severity":"high","cvss":7.8,"epss":null,"exploited":true,"exploited_at":"2026-04-13T00:00:00+00:00","products":[{"name":"Microsoft Windows","fixed":[],"affected":"","ecosystem":"vendor"},{"name":"microsoft windows 10 1507","fixed":["10.0.10240.20308"],"affected":"< 10.0.10240.20308","ecosystem":"vendor"},{"name":"microsoft windows 10 1607","fixed":["10.0.14393.6452"],"affected":"< 10.0.14393.6452","ecosystem":"vendor"},{"name":"microsoft windows 10 1809","fixed":["10.0.17763.5122"],"affected":"< 10.0.17763.5122","ecosystem":"vendor"},{"name":"microsoft windows 10 21h2","fixed":["10.0.19044.3693"],"affected":"< 10.0.19044.3693","ecosystem":"vendor"},{"name":"microsoft windows 10 22h2","fixed":["10.0.19045.3693"],"affected":"< 10.0.19045.3693","ecosystem":"vendor"},{"name":"microsoft windows 11 21h2","fixed":["10.0.22000.2600"],"affected":"< 10.0.22000.2600","ecosystem":"vendor"},{"name":"microsoft windows 11 22h2","fixed":["10.0.22621.2715"],"affected":"< 10.0.22621.2715","ecosystem":"vendor"},{"name":"microsoft windows 11 23h2","fixed":["10.0.22631.2715"],"affected":"< 10.0.22631.2715","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":["10.0.14393.6452"],"affected":"< 10.0.14393.6452","ecosystem":"vendor"},{"name":"microsoft windows server 2019","fixed":["10.0.17763.5122"],"affected":"< 10.0.17763.5122","ecosystem":"vendor"},{"name":"microsoft windows server 2022","fixed":["10.0.20348.2091"],"affected":"< 10.0.20348.2091","ecosystem":"vendor"},{"name":"microsoft windows server 2022 23h2","fixed":["10.0.25398.531"],"affected":"< 10.0.25398.531","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["exploited","infrastructure","self-hosted","windows"],"not_affected_if":["fully-patched-windows"],"how_to_check":"Check Windows Update history for the Microsoft security update that fixes CVE-2023-36424 (July 2023 Patch Tuesday or later); unknown for exact KB number in sources.","fix":"Install the Microsoft security update that fixes CVE-2023-36424 (apply mitigations per vendor instructions if the patch is unavailable).","status":"open","published_at":"2023-11-14T18:15:45+00:00","first_seen_at":"2026-10-23T19:11:51+00:00","triaged_at":"2026-10-23T20:38:52+00:00","updated_at":"2026-10-23T23:44:51+00:00","category":"infrastructure","confidence":0.7,"triage":{"at":"2026-10-23T20:38:52Z","model":"claude-haiku-5-5","output":{"fix":"Install the Microsoft security update that fixes CVE-2023-36424 (apply mitigations per vendor instructions if the patch is unavailable).\nunknown","reach":"local","summary":"The Windows Common Log File System (CLFS) driver reads memory past the end of a buffer. A local attacker who can run code on the machine can use this to escalate to higher privileges.","category":"infrastructure","who_cares":["windows","self-hosted"],"confidence":0.7,"needs_auth":"yes","worst_case":"Attacker who already runs code on the machine gains SYSTEM-level privileges.","analyst_note":"Confirm the exact patched Windows builds and KB numbers from the Microsoft Security Update Guide entry for CVE-2023-36424.","how_to_check":"Check Windows Update history for the Microsoft security update that fixes CVE-2023-36424 (July 2023 Patch Tuesday or later); unknown for exact KB number in sources.\nunknown","needs_analyst":true,"not_affected_if":["fully-patched-windows"],"user_interaction":"no","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000453,"input_tokens":2529,"output_tokens":400,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-01':160C '-2023':12A,15A '-36424':13A,16A '10':21A,25A,29A,33A,37A '11':41A,45A,49A '1507':22A '1607':26A '1809':30A '2008':54A,58A '2012':62A,66A '2016':70A '2019':74A '2022':78A,82A '21h2':34A,42A '22':159C '22h2':38A,46A '23h2':50A,83A 'action':150C 'actor':144C 'allow':141C 'appli':151C 'applic':157C 'attack':108B 'bod':158C 'bound':136C 'buffer':105B 'cisa':148C 'clfs':96B 'cloud':163C 'code':112B 'common':2A,92B,126C 'contain':131C 'could':140C 'cve':11A,14A 'discontinu':166C 'driver':6A,97B,130C 'elev':7A 'end':102B 'escal':120B,147C 'exploit':84B 'file':4A,94B,128C 'follow':156C 'guidanc':161C 'higher':122B 'host':88B 'infrastructur':85B 'instruct':155C 'local':107B 'log':3A,93B,127C 'machin':115B 'memori':99B 'microsoft':17A,19A,23A,27A,31A,35A,39A,43A,47A,51A,55A,59A,63A,67A,71A,75A,79A,124C 'mitig':152C,172C 'out-of-bound':133C 'past':100B 'per':153C 'privileg':9A,123B,146C 'product':170C 'read':98B,137C 'requir':149C 'run':111B 'self':87B 'self-host':86B 'server':53A,57A,61A,65A,69A,73A,77A,81A 'servic':164C 'system':5A,95B,129C 'threat':143C 'unavail':174C 'use':117B,167C 'vendor':154C 'vulner':10A,138C 'window':1A,89B,91B,125C 'windows':18A,20A,24A,28A,32A,36A,40A,44A,48A,52A,56A,60A,64A,68A,72A,76A,80A","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2023-11-14T18:15:45+00:00","kev":{"dateAdded":"2026-04-13","dueDate":"2026-04-27","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":"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-2023-36424","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2023-36424","severity":null,"published_at":"2026-04-13T00:00:00+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-2023-36424","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-36424","severity":null,"published_at":"2023-11-14T18:15:45+00:00","modified_at":"2026-06-17T06:06:15+00:00","first_seen_at":"2026-10-23T23:44:51+00:00","fetched_at":"2026-10-23T23:44:51+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"}