{"id":"CVE-2025-32706","published":"2025-05-13T17:16:03Z","modified":"2026-06-17T09:12:27Z","title":"Microsoft Windows Common Log File System (CLFS) Driver Heap-Based Buffer Overflow Vulnerability","vendor":"Microsoft","product":"Windows","tier":"core","eol":null,"description":{"text":"Improper input validation in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.","provenance":"source","from":"NVD"},"summary":{"text":"A heap-based buffer overflow in the Common Log File System (CLFS) driver of Microsoft Windows, caused by improper input validation, lets a local user escalate privileges. An attacker needs an existing low-privilege authenticated account on the local machine, and no user interaction is required.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-23T07:12:26Z"},"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":0.02333,"percentile":0.83518,"date":"2026-10-29","provenance":"source"},"kev":{"dateAdded":"2025-05-13","dueDate":"2025-06-03","ransomware":false,"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.","notes":"https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2025-32706 ; https://nvd.nist.gov/vuln/detail/CVE-2025-32706","provenance":"source"},"vulncheckKev":{"dateAdded":"2025-05-13","exploitedFirstSeen":"2025-05-13","ransomware":false,"evidence":[{"url":"https://api.msrc.microsoft.com/cvrf/v3.0/cvrf/2025-May","date":"2025-05-13"},{"url":"https://docs.google.com/spreadsheets/d/1lkNJ0uQwbeC1ZTRrxdtuPLCIl7mlUreoKfSIgajnSyY/edit","date":"2025-05-13"},{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-32706","date":"2025-05-13"},{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2025-05-13"},{"url":"https://www.loginsoft.com/reports/annually/vulnerability-intelligence-report-2025","date":"2026-01-20"},{"url":"https://www.crowdstrike.com/explore/2026-global-threat-report","date":"2026-02-24"}],"evidenceTotal":6,"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-20","name":"Improper Input Validation"},{"id":"CWE-122","name":"Heap-based Buffer Overflow"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-32706","tags":["Vendor Advisory"]},{"url":"https://www.vicarius.io/vsociety/posts/cve-2025-32706-detection-script-elevation-of-privilege-vulnerability-in-microsoft-windows-common-log-file-system-driver","tags":["Exploit","Third Party Advisory"]},{"url":"https://www.vicarius.io/vsociety/posts/cve-2025-32706-mitigation-script-elevation-of-privilege-vulnerability-in-microsoft-windows-common-log-file-system-driver","tags":["Exploit","Mitigation","Third Party Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-32706","tags":["US Government Resource"]}],"techniques":[{"id":"T1059","name":"Command and Scripting Interpreter","tactics":["execution"],"provenance":"source","basis":"ctid-kev","bases":["ctid-kev"],"basisDetail":"CTID Mappings Explorer KEV 07/28/2025 (ATT&CK 16.1); capability: Buffer Overflow","mappingType":"exploitation_technique","evidence":[],"comment":"Attackers have exploited this heap-based buffer overflow vulnerability to escalate their privileges to SYSTEM-level, allowing them to execute arbitrary code, disable security tools, deploy malicious payloads, and extract credentials from memory.","confidence":"high"},{"id":"T1068","name":"Exploitation for Privilege Escalation","tactics":["privilege-escalation"],"provenance":"source","basis":"ctid-kev","bases":["ctid-kev"],"basisDetail":"CTID Mappings Explorer KEV 07/28/2025 (ATT&CK 16.1); capability: Buffer Overflow","mappingType":"exploitation_technique","evidence":[],"comment":"Attackers have exploited this heap-based buffer overflow vulnerability to escalate their privileges to SYSTEM-level, allowing them to execute arbitrary code, disable security tools, deploy malicious payloads, and extract credentials from memory.","confidence":"high"},{"id":"T1003.001","name":"LSASS Memory","tactics":["credential-access"],"provenance":"source","basis":"ctid-kev","bases":["ctid-kev"],"basisDetail":"CTID Mappings Explorer KEV 07/28/2025 (ATT&CK 16.1); capability: Buffer Overflow","mappingType":"primary_impact","evidence":[],"comment":"Attackers have exploited this heap-based buffer overflow vulnerability to escalate their privileges to SYSTEM-level, allowing them to execute arbitrary code, disable security tools, deploy malicious payloads, and extract credentials from memory.","confidence":"high"},{"id":"T1543","name":"Create or Modify System Process","tactics":["persistence","privilege-escalation"],"provenance":"source","basis":"ctid-kev","bases":["ctid-kev"],"basisDetail":"CTID Mappings Explorer KEV 07/28/2025 (ATT&CK 16.1); capability: Buffer Overflow","mappingType":"primary_impact","evidence":[],"comment":"Attackers have exploited this heap-based buffer overflow vulnerability to escalate their privileges to SYSTEM-level, allowing them to execute arbitrary code, disable security tools, deploy malicious payloads, and extract credentials from memory.","confidence":"high"},{"id":"T1608.001","name":"Upload Malware","tactics":["resource-development"],"provenance":"source","basis":"ctid-kev","bases":["ctid-kev"],"basisDetail":"CTID Mappings Explorer KEV 07/28/2025 (ATT&CK 16.1); capability: Buffer Overflow","mappingType":"primary_impact","evidence":[],"comment":"Attackers have exploited this heap-based buffer overflow vulnerability to escalate their privileges to SYSTEM-level, allowing them to execute arbitrary code, disable security tools, deploy malicious payloads, and extract credentials from memory.","confidence":"high"}],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2025-14441","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2025-14441","exploited":true,"exploitedSince":"2025-05-13","provenance":"source"},"exploits":[],"exploitSources":null,"exploitRefs":["https://www.vicarius.io/vsociety/posts/cve-2025-32706-detection-script-elevation-of-privilege-vulnerability-in-microsoft-windows-common-log-file-system-driver","https://www.vicarius.io/vsociety/posts/cve-2025-32706-mitigation-script-elevation-of-privilege-vulnerability-in-microsoft-windows-common-log-file-system-driver"],"flow":[{"stage":"exploitation","techniques":["T1059","T1068"],"provenance":"source"},{"stage":"primary","techniques":["T1608.001","T1543","T1003.001"],"provenance":"source"}],"timeline":[{"date":"2025-05-13","kind":"published","label":"Published (NVD)","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-32706","provenance":"source"},{"date":"2025-05-13","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV evidence)","url":"https://api.msrc.microsoft.com/cvrf/v3.0/cvrf/2025-May","provenance":"source"},{"date":"2025-05-13","kind":"kev","label":"Added to CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","provenance":"source"},{"date":"2025-05-13","kind":"euvd-exploited","label":"ENISA EUVD: exploited","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2025-14441","provenance":"source"}],"speed":{"daysToPublicExploit":null,"firstExploitFrom":null,"daysToKev":0},"priority":{"score":65.2,"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 535 days ago"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":16.7,"detail":"percentile 0.8352"},{"name":"Named in threat reports","points":0.0,"detail":"0 reports"},{"name":"Public exploit code","points":5.0,"detail":"2 NVD references tagged Exploit"},{"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-20"}}