{"id":"CVE-2023-23376","kind":"vulnerability","aliases":["CVE-2023-23376"],"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. Exploitation in the wild is confirmed and the tag indicates ransomware use, so an attacker with a foothold on a Windows machine can gain SYSTEM rights.","severity":"high","cvss":7.8,"epss":null,"exploited":true,"exploited_at":"2023-02-14T00:00:00+00:00","products":[{"name":"Microsoft Windows","fixed":[],"affected":"","ecosystem":"vendor"},{"name":"microsoft windows 10 1507","fixed":["10.0.10240.19747"],"affected":"< 10.0.10240.19747","ecosystem":"vendor"},{"name":"microsoft windows 10 1607","fixed":["10.0.14393.5717"],"affected":"< 10.0.14393.5717","ecosystem":"vendor"},{"name":"microsoft windows 10 1809","fixed":["10.0.17763.4010"],"affected":"< 10.0.17763.4010","ecosystem":"vendor"},{"name":"microsoft windows 10 20h2","fixed":["10.0.19042.2604"],"affected":"< 10.0.19042.2604","ecosystem":"vendor"},{"name":"microsoft windows 10 21h2","fixed":["10.0.19044.2604"],"affected":"< 10.0.19044.2604","ecosystem":"vendor"},{"name":"microsoft windows 10 22h2","fixed":["10.0.19045.2604"],"affected":"< 10.0.19045.2604","ecosystem":"vendor"},{"name":"microsoft windows 11 21h2","fixed":["10.0.22000.1574"],"affected":"< 10.0.22000.1574","ecosystem":"vendor"},{"name":"microsoft windows 11 22h2","fixed":["10.0.22621.1265"],"affected":"< 10.0.22621.1265","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":["10.0.14393.5717"],"affected":"< 10.0.14393.5717","ecosystem":"vendor"},{"name":"microsoft windows server 2019","fixed":["10.0.17763.4010"],"affected":"< 10.0.17763.4010","ecosystem":"vendor"},{"name":"microsoft windows server 2022","fixed":["10.0.20348.1540"],"affected":"< 10.0.20348.1540","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["exploited","infrastructure","ransomware","windows"],"not_affected_if":[],"how_to_check":null,"fix":"Apply the Microsoft Windows security update for CVE-2023-23376 per vendor instructions (CISA KEV required action).\nFix version list: unknown","status":"open","published_at":"2023-02-14T00:00:00+00:00","first_seen_at":"2026-10-23T19:11:52+00:00","triaged_at":"2026-10-23T21:08:40+00:00","updated_at":"2026-10-23T22:29:04+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-10-23T21:08:40Z","model":"claude-haiku-5-5","output":{"fix":"Apply the Microsoft Windows security update for CVE-2023-23376 per vendor instructions (CISA KEV required action).\nFix version list: unknown","reach":"local","impact":"high","summary":"Microsoft Windows' Common Log File System (CLFS) driver has a flaw that lets a local user escalate privileges. Exploitation in the wild is confirmed and the tag indicates ransomware use, so an attacker with a foothold on a Windows machine can gain SYSTEM rights.","category":"infrastructure","who_cares":["windows"],"confidence":0.6,"needs_auth":"yes","worst_case":"Local attacker gains SYSTEM privileges on the Windows host","analyst_note":"Find the Microsoft Security Response Center advisory for CVE-2023-23376 to confirm affected Windows builds, patched KB numbers and any detection guidance.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":[],"user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000466,"input_tokens":2803,"output_tokens":371,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2023':12A,15A '-23376':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':146C 'allow':140C 'appli':147C 'attack':115B 'cisa':144C 'clfs':89B,133C 'common':2A,85B,129C 'confirm':106B 'contain':135C 'cve':11A,14A 'driver':6A,90B,134C 'elev':7A 'escal':99B,143C 'exploit':79B,101B 'file':4A,87B,131C 'flaw':93B 'foothold':118B 'gain':124B 'indic':110B 'infrastructur':80B 'instruct':151C 'let':95B 'local':97B 'log':3A,86B,130C 'machin':122B 'microsoft':17A,19A,23A,27A,31A,35A,39A,43A,47A,51A,55A,59A,63A,67A,71A,75A,83B,127C 'per':149C 'privileg':9A,100B,142C 'ransomwar':81B,111B 'requir':145C 'right':126B 'server':53A,57A,61A,65A,69A,73A,77A 'system':5A,88B,125B,132C 'tag':109B 'unspecifi':137C 'updat':148C 'use':112B 'user':98B 'vendor':150C 'vulner':10A,138C 'wild':104B 'window':1A,82B,84B,121B,128C '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":"2023-02-14T00:00:00+00:00","kev":{"dateAdded":"2023-02-14","dueDate":"2023-03-07","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-2023-23376","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2023-23376","severity":null,"published_at":"2023-02-14T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:52+00:00","fetched_at":"2026-10-25T12:39:23+00:00","note":null},{"source":"nvd","external_id":"CVE-2023-23376","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-23376","severity":null,"published_at":"2023-02-14T20:15:16+00:00","modified_at":"2026-08-19T17:18:20+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"}