{"id":"CVE-2023-28252","kind":"vulnerability","aliases":["CVE-2023-28252"],"related":[],"title":"Windows Common Log File System Driver Elevation of Privilege Vulnerability","description":"Microsoft Windows Common Log File System (CLFS) driver contains an unspecified vulnerability that allows for privilege escalation.\n\nCISA required action: Apply updates per vendor instructions.","summary":"Microsoft Windows Common Log File System (CLFS) driver has a flaw that lets a local user escalate privileges. It is confirmed exploited in the wild and tagged as used in ransomware attacks.","severity":"high","cvss":7.8,"epss":null,"exploited":true,"exploited_at":"2023-04-11T00:00:00+00:00","products":[{"name":"Microsoft Windows","fixed":[],"affected":"","ecosystem":"vendor"},{"name":"microsoft windows 10 1507","fixed":["10.0.10240.19869"],"affected":"< 10.0.10240.19869","ecosystem":"vendor"},{"name":"microsoft windows 10 1607","fixed":["10.0.14393.5850"],"affected":"< 10.0.14393.5850","ecosystem":"vendor"},{"name":"microsoft windows 10 1809","fixed":["10.0.17763.4252"],"affected":"< 10.0.17763.4252","ecosystem":"vendor"},{"name":"microsoft windows 10 20h2","fixed":["10.0.19042.2846"],"affected":"< 10.0.19042.2846","ecosystem":"vendor"},{"name":"microsoft windows 10 21h2","fixed":["10.0.19044.2846"],"affected":"< 10.0.19044.2846","ecosystem":"vendor"},{"name":"microsoft windows 10 22h2","fixed":["10.0.19045.2846"],"affected":"< 10.0.19045.2846","ecosystem":"vendor"},{"name":"microsoft windows 11 21h2","fixed":["10.0.22000.1817"],"affected":"< 10.0.22000.1817","ecosystem":"vendor"},{"name":"microsoft windows 11 22h2","fixed":["10.0.22621.1555"],"affected":"< 10.0.22621.1555","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":[],"affected":"","ecosystem":"vendor"},{"name":"microsoft windows server 2019","fixed":[],"affected":"","ecosystem":"vendor"},{"name":"microsoft windows server 2022","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["exploited","infrastructure","ransomware","windows"],"not_affected_if":["unpatched-check-passed"],"how_to_check":null,"fix":"Apply the Microsoft Windows security update that addresses CVE-2023-28252, per vendor instructions (CISA KEV required action).","status":"open","published_at":"2023-04-11T00:00:00+00:00","first_seen_at":"2026-10-23T19:11:52+00:00","triaged_at":"2026-10-23T21:06:57+00:00","updated_at":"2026-10-23T22:29:04+00:00","category":"infrastructure","confidence":0.7,"triage":{"at":"2026-10-23T21:06:57Z","model":"claude-haiku-5-5","output":{"fix":"Apply the Microsoft Windows security update that addresses CVE-2023-28252, per vendor instructions (CISA KEV required action).","reach":"local","impact":"high","summary":"Microsoft Windows Common Log File System (CLFS) driver has a flaw that lets a local user escalate privileges. It is confirmed exploited in the wild and tagged as used in ransomware attacks.","category":"infrastructure","who_cares":["windows"],"confidence":0.7,"needs_auth":"yes","worst_case":"local attacker gains SYSTEM-level privileges on the Windows machine","analyst_note":"Find the Microsoft Security Update Guide entry for CVE-2023-28252 to confirm affected Windows builds and the fixed KB numbers; the sources here do not list them.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["unpatched-check-passed"],"user_interaction":"no","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000455,"input_tokens":2803,"output_tokens":349,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2023':12A,15A '-28252':13A,16A '10':21A,25A,29A,33A,37A,41A '11':45A,49A '1507':22A '1607':26A '1809':30A '2008':54A,58A '2012':62A,66A '2016':70A '2019':74A '2022':78A '20h2':34A '21h2':38A,46A '22h2':42A,50A 'action':134C 'allow':128C 'appli':135C 'attack':114B 'cisa':132C 'clfs':89B,121C 'common':2A,85B,117C 'confirm':103B 'contain':123C 'cve':11A,14A 'driver':6A,90B,122C 'elev':7A 'escal':99B,131C 'exploit':79B,104B 'file':4A,87B,119C 'flaw':93B 'infrastructur':80B 'instruct':139C 'let':95B 'local':97B 'log':3A,86B,118C 'microsoft':17A,19A,23A,27A,31A,35A,39A,43A,47A,51A,55A,59A,63A,67A,71A,75A,83B,115C 'per':137C 'privileg':9A,100B,130C 'ransomwar':81B,113B 'requir':133C 'server':53A,57A,61A,65A,69A,73A,77A 'system':5A,88B,120C 'tag':109B 'unspecifi':125C 'updat':136C 'use':111B 'user':98B 'vendor':138C 'vulner':10A,126C 'wild':107B 'window':1A,82B,84B,116C 'windows':18A,20A,24A,28A,32A,36A,40A,44A,48A,52A,56A,60A,64A,68A,72A,76A","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2023-04-11T00:00:00+00:00","kev":{"dateAdded":"2023-04-11","dueDate":"2023-05-02","requiredAction":"Apply updates per vendor instructions.","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-2023-28252","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2023-28252","severity":null,"published_at":"2023-04-11T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:52+00:00","fetched_at":"2026-10-25T15:39:41+00:00","note":null},{"source":"nvd","external_id":"CVE-2023-28252","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-28252","severity":null,"published_at":"2023-04-11T21:15:25+00:00","modified_at":"2026-06-17T05:47:14+00:00","first_seen_at":"2026-10-23T22:29:04+00:00","fetched_at":"2026-10-23T22:29:04+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"}