{"id":"CVE-2024-38193","published":"2024-08-13T18:15:28Z","modified":"2026-06-17T07:39:39Z","title":"Microsoft Windows Ancillary Function Driver for WinSock Privilege Escalation Vulnerability","vendor":"Microsoft","product":"Windows","tier":"core","eol":null,"description":{"text":"Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability","provenance":"source","from":"NVD"},"summary":{"text":"A use-after-free flaw in Microsoft Windows' Ancillary Function Driver for WinSock (afd.sys) allows privilege escalation. An attacker who already has local, low-privileged access to the system can exploit it without user interaction to gain elevated privileges.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-23T07:11:04Z"},"cvss":{"score":7.8,"severity":"HIGH","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","provenance":"source","from":"NVD"},"epss":{"score":0.28739,"percentile":0.98137,"date":"2026-10-29","provenance":"source"},"kev":{"dateAdded":"2024-08-13","dueDate":"2024-09-03","ransomware":false,"requiredAction":"Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.","notes":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-38193; https://nvd.nist.gov/vuln/detail/CVE-2024-38193","provenance":"source"},"vulncheckKev":{"dateAdded":"2024-08-13","exploitedFirstSeen":"2024-08-13","ransomware":false,"evidence":[{"url":"https://api.msrc.microsoft.com/cvrf/v3.0/cvrf/2024-Aug","date":"2024-08-13"},{"url":"https://docs.google.com/spreadsheets/d/1lkNJ0uQwbeC1ZTRrxdtuPLCIl7mlUreoKfSIgajnSyY/edit","date":"2024-08-13"},{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-38193","date":"2024-08-13"},{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2024-08-13"},{"url":"https://www.gendigital.com/blog/insights/research/protecting-windows-users","date":"2024-08-16"},{"url":"https://www.gendigital.com/blog/news/innovation/protecting-windows-users","date":"2024-08-16"},{"url":"https://www.microsoft.com/en-us/security/blog/2024/08/30/north-korean-threat-actor-citrine-sleet-exploiting-chromium-zero-day/","date":"2024-08-30"},{"url":"https://www.gendigital.com/blog/news/innovation/lazarus-fudmodule-v3","date":"2024-09-19"},{"url":"https://www.cyfirma.com/research/apt-quarterly-highlights-q3-2024/","date":"2024-10-25"},{"url":"https://www.gendigital.com/blog/insights/reports/threat-report-q3-2024","date":"2024-11-19"}],"evidenceTotal":15,"provenance":"source"},"exploited":true,"otx":{"pulseCount":50,"pulses":[{"name":"Actively_Exploited_Kev | Oct 30, 2026","url":"https://otx.alienvault.com/pulse/6ae35d889ea92b4ce19c2680","created":"2026-10-29"},{"name":"Actively_Exploited_Kev | Oct 29, 2026","url":"https://otx.alienvault.com/pulse/6ae20c1db17e7057ae7d9ad1","created":"2026-10-28"},{"name":"Actively_Exploited_Kev | Oct 28, 2026","url":"https://otx.alienvault.com/pulse/6ae0ba7e0e2a97ff7b218819","created":"2026-10-27"},{"name":"Actively_Exploited_Kev | Oct 27, 2026","url":"https://otx.alienvault.com/pulse/6adf68b85c3e852f3c111d18","created":"2026-10-26"},{"name":"Actively_Exploited_Kev | Oct 24, 2026","url":"https://otx.alienvault.com/pulse/6adb740e397c3ad4799aa4cd","created":"2026-10-23"},{"name":"Actively_Exploited_Kev | Oct 23, 2026","url":"https://otx.alienvault.com/pulse/6ada236fcfba2dfa730ea482","created":"2026-10-22"},{"name":"Actively_Exploited_Kev | Oct 22, 2026","url":"https://otx.alienvault.com/pulse/6ad8d33a077cbb5cab524d80","created":"2026-10-21"},{"name":"Actively_Exploited_Kev | Oct 21, 2026","url":"https://otx.alienvault.com/pulse/6ad78130c4d1ac2be83a8b6d","created":"2026-10-20"},{"name":"Actively_Exploited_Kev | Oct 20, 2026","url":"https://otx.alienvault.com/pulse/6ad62f63c24a405a3423cc13","created":"2026-10-19"},{"name":"Actively_Exploited_Kev | Oct 19, 2026","url":"https://otx.alienvault.com/pulse/6ad4dda174e5797d0bd238b7","created":"2026-10-18"}],"provenance":"machine"},"cwes":[{"id":"CWE-416","name":"Use After Free"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-38193","tags":["Patch","Vendor Advisory"]},{"url":"https://www.exploit-db.com/exploits/52284","tags":["Exploit"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-38193","tags":["US Government Resource"]}],"techniques":[{"id":"T1068","name":"Exploitation for Privilege Escalation","tactics":["privilege-escalation"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: Local privilege escalation via kernel driver flaw","mappingType":"exploitation_technique","evidence":[{"from":"description","quote":"Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability","start":0,"end":82}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"}],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2024-37161","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2024-37161","exploited":true,"exploitedSince":"2024-08-13","provenance":"source"},"exploits":[{"id":52284,"url":"https://www.exploit-db.com/exploits/52284","title":"Microsoft Windows 11 Pro 23H2 - Ancillary Function Driver for WinSock Privilege Escalation","type":"local","platform":"windows","date":"2025-05-09","verified":false,"provenance":"source"}],"exploitSources":{"exploitdb":{"count":1,"earliest":"2025-05-09"},"pocGithub":{"count":1,"skipped":0,"earliest":"2024-12-03","earliestUrl":"https://github.com/killvxk/CVE-2024-38193-Nephster","repos":[{"name":"killvxk/CVE-2024-38193-Nephster","url":"https://github.com/killvxk/CVE-2024-38193-Nephster","stars":61,"created":"2024-12-03"}]},"first":{"date":"2024-12-03","source":"PoC-in-GitHub","url":"https://github.com/killvxk/CVE-2024-38193-Nephster"},"provenance":"source"},"exploitRefs":["https://www.exploit-db.com/exploits/52284"],"flow":[{"stage":"exploitation","techniques":["T1068"],"provenance":"ai"}],"timeline":[{"date":"2024-08-13","kind":"published","label":"Published (NVD)","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-38193","provenance":"source"},{"date":"2024-08-13","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV evidence)","url":"https://api.msrc.microsoft.com/cvrf/v3.0/cvrf/2024-Aug","provenance":"source"},{"date":"2024-08-13","kind":"kev","label":"Added to CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","provenance":"source"},{"date":"2024-08-13","kind":"euvd-exploited","label":"ENISA EUVD: exploited","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2024-37161","provenance":"source"},{"date":"2024-12-03","kind":"exploit-public","label":"First public exploit: PoC-in-GitHub; later: Exploit-DB 2025-05-09","url":"https://github.com/killvxk/CVE-2024-38193-Nephster","provenance":"source"}],"speed":{"daysToPublicExploit":112,"firstExploitFrom":"PoC-in-GitHub","daysToKev":0},"priority":{"score":68.1,"factors":[{"name":"In a KEV catalog","points":35.0,"detail":"listed in CISA KEV and VulnCheck KEV"},{"name":"Recent KEV listing","points":0.0,"detail":"added 808 days ago"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":19.63,"detail":"percentile 0.9814"},{"name":"Named in threat reports","points":0.0,"detail":"0 reports"},{"name":"Public exploit code","points":5.0,"detail":"1 NVD reference tagged Exploit; 1 Exploit-DB entry; 1 PoC-in-GitHub repo"},{"name":"Mentioned in OTX pulses","points":3.0,"detail":"50 pulses"},{"name":"CVSS severity","points":5.46,"detail":"base score 7.8"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]},"lineage":{"familyId":"fam-class-microsoft-windows-cwe-416"}}