{"id":"CVE-2024-38193","kind":"vulnerability","aliases":["CVE-2024-38193"],"related":[],"title":"Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability","description":"Microsoft Windows Ancillary Function Driver for WinSock contains an unspecified vulnerability that allows for privilege escalation, enabling a local attacker to gain SYSTEM privileges.\n\nCISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.","summary":"A flaw in the Windows Ancillary Function Driver for WinSock (afd.sys) lets a local user escalate privileges. Successful exploitation gives the attacker SYSTEM rights on the machine.","severity":"high","cvss":7.8,"epss":null,"exploited":true,"exploited_at":"2024-08-13T00:00:00+00:00","products":[{"name":"Microsoft Windows","fixed":[],"affected":"","ecosystem":"vendor"},{"name":"microsoft windows 10 1507","fixed":["10.0.10240.20751"],"affected":"< 10.0.10240.20751","ecosystem":"vendor"},{"name":"microsoft windows 10 1607","fixed":["10.0.14393.7259"],"affected":"< 10.0.14393.7259","ecosystem":"vendor"},{"name":"microsoft windows 10 1809","fixed":["10.0.17763.6189"],"affected":"< 10.0.17763.6189","ecosystem":"vendor"},{"name":"microsoft windows 10 21h2","fixed":["10.0.19044.4780"],"affected":"< 10.0.19044.4780","ecosystem":"vendor"},{"name":"microsoft windows 10 22h2","fixed":["10.0.19045.4780"],"affected":"< 10.0.19045.4780","ecosystem":"vendor"},{"name":"microsoft windows 11 21h2","fixed":["10.0.22000.3147"],"affected":"< 10.0.22000.3147","ecosystem":"vendor"},{"name":"microsoft windows 11 22h2","fixed":["10.0.22621.4037"],"affected":"< 10.0.22621.4037","ecosystem":"vendor"},{"name":"microsoft windows 11 23h2","fixed":["10.0.22631.4037"],"affected":"< 10.0.22631.4037","ecosystem":"vendor"},{"name":"microsoft windows 11 24h2","fixed":["10.0.26100.1457"],"affected":"< 10.0.26100.1457","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":["6.2.9200.25031"],"affected":"< 6.2.9200.25031","ecosystem":"vendor"},{"name":"microsoft windows server 2012","fixed":[],"affected":"= r2","ecosystem":"vendor"},{"name":"microsoft windows server 2016","fixed":["10.0.14393.7259"],"affected":"< 10.0.14393.7259","ecosystem":"vendor"},{"name":"microsoft windows server 2019","fixed":["10.0.17763.6189"],"affected":"< 10.0.17763.6189","ecosystem":"vendor"},{"name":"microsoft windows server 2022","fixed":["10.0.20348.2655"],"affected":"< 10.0.20348.2655","ecosystem":"vendor"},{"name":"microsoft windows server 2022 23h2","fixed":["10.0.25398.1085"],"affected":"< 10.0.25398.1085","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-2024-38193 per vendor instructions; the sources do not name the KB or build number.","status":"open","published_at":"2024-08-13T00:00:00+00:00","first_seen_at":"2026-10-23T19:11:51+00:00","triaged_at":"2026-10-23T20:58:26+00:00","updated_at":"2026-10-23T22:29:05+00:00","category":"infrastructure","confidence":0.8,"triage":{"at":"2026-10-23T20:58:26Z","model":"claude-haiku-5-5","output":{"fix":"Apply the Microsoft security update for CVE-2024-38193 per vendor instructions; the sources do not name the KB or build number.","reach":"local","impact":"high","summary":"A flaw in the Windows Ancillary Function Driver for WinSock (afd.sys) lets a local user escalate privileges. Successful exploitation gives the attacker SYSTEM rights on the machine.","category":"infrastructure","who_cares":["windows","self-hosted"],"confidence":0.8,"needs_auth":"yes","worst_case":"local user gains SYSTEM privileges on the Windows machine","analyst_note":"Find the Microsoft Security Response Center advisory for CVE-2024-38193 to get the patched KB numbers and affected Windows builds for how_to_check and fix.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["unknown"],"user_interaction":"no","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000455,"input_tokens":2841,"output_tokens":341,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2024':12A,15A '-38193':13A,16A '10':21A,25A,29A,33A,37A '11':41A,45A,49A,53A '1507':22A '1607':26A '1809':30A '2008':58A,62A '2012':66A,70A '2016':74A '2019':78A '2022':82A,86A '21h2':34A,42A '22h2':38A,46A '23h2':50A,87A '24h2':54A 'action':147C 'afd.sys':104B 'allow':133C 'ancillari':2A,99B,123C 'appli':148C 'attack':115B,140C 'cisa':145C 'contain':128C 'cve':11A,14A 'discontinu':154C 'driver':4A,101B,125C 'elev':7A 'enabl':137C 'escal':109B,136C 'exploit':88B,112B 'flaw':95B 'function':3A,100B,124C 'gain':142C 'give':113B 'host':92B 'infrastructur':89B 'instruct':152C 'let':105B 'local':107B,139C 'machin':120B 'microsoft':17A,19A,23A,27A,31A,35A,39A,43A,47A,51A,55A,59A,63A,67A,71A,75A,79A,83A,121C 'mitig':149C,160C 'per':150C 'privileg':9A,110B,135C,144C 'product':158C 'requir':146C 'right':117B 'self':91B 'self-host':90B 'server':57A,61A,65A,69A,73A,77A,81A,85A 'success':111B 'system':116B,143C 'unavail':162C 'unspecifi':130C 'use':155C 'user':108B 'vendor':151C 'vulner':10A,131C 'window':1A,93B,98B,122C 'windows':18A,20A,24A,28A,32A,36A,40A,44A,48A,52A,56A,60A,64A,68A,72A,76A,80A,84A 'winsock':6A,103B,127C","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2024-08-13T00:00:00+00:00","kev":{"dateAdded":"2024-08-13","dueDate":"2024-09-03","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-2024-38193","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2024-38193","severity":null,"published_at":"2024-08-13T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:51+00:00","fetched_at":"2026-10-25T13:39:30+00:00","note":null},{"source":"nvd","external_id":"CVE-2024-38193","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-38193","severity":null,"published_at":"2024-08-13T18:15:28+00:00","modified_at":"2026-06-17T07:39:39+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"}