{"id":"CVE-2020-1464","published":"2020-08-17T19:15:14Z","modified":"2026-06-17T03:01:28Z","title":"Microsoft Windows Spoofing Vulnerability","vendor":"Microsoft","product":"Windows","tier":"core","eol":null,"description":{"text":"A spoofing vulnerability exists when Windows incorrectly validates file signatures. An attacker who successfully exploited this vulnerability could bypass security features and load improperly signed files.\nIn an attack scenario, an attacker could bypass security features intended to prevent improperly signed files from being loaded.\nThe update addresses the vulnerability by correcting how Windows validates file signatures.","provenance":"source","from":"NVD"},"summary":{"text":"A spoofing flaw in Microsoft Windows stems from incorrect validation of file signatures, which lets improperly signed files be loaded past security features. An attacker with local access and low-privilege credentials, requiring no user interaction, could exploit this to bypass protections against unsigned or improperly signed files.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-23T07:11:00Z"},"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":0.38946,"percentile":0.98585,"date":"2026-10-28","provenance":"source"},"kev":{"dateAdded":"2021-11-03","dueDate":"2022-05-03","ransomware":false,"requiredAction":"Apply updates per vendor instructions.","notes":"https://nvd.nist.gov/vuln/detail/CVE-2020-1464","provenance":"source"},"vulncheckKev":{"dateAdded":"2020-08-11","exploitedFirstSeen":"2020-08-11","ransomware":false,"evidence":[{"url":"https://api.msrc.microsoft.com/cvrf/v3.0/cvrf/2020-Aug","date":"2020-08-11"},{"url":"https://cisa.gov/news-events/alerts/2020/08/11/microsoft-addresses-rce-and-spoofing-vulnerabilities-under-active","date":"2020-08-11"},{"url":"https://twitter.com/Securityinbits/status/1271406138588708866","date":"2020-08-16"},{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2021-11-03"}],"evidenceTotal":4,"provenance":"source"},"exploited":true,"otx":{"pulseCount":50,"pulses":[{"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"},{"name":"Actively_Exploited_Kev | Oct 18, 2026","url":"https://otx.alienvault.com/pulse/6ad38c22e1848f8189d1c121","created":"2026-10-17"}],"provenance":"machine"},"cwes":[{"id":"CWE-347","name":"Improper Verification of Cryptographic Signature"}],"references":[{"url":"https://blog.virustotal.com/2019/01/distribution-of-malicious-jar-appended.html","tags":["Third Party Advisory"]},{"url":"https://krebsonsecurity.com/2020/08/microsoft-put-off-fixing-zero-day-for-2-years/","tags":["Issue Tracking","Third Party Advisory"]},{"url":"https://medium.com/%40TalBeerySec/glueball-the-story-of-cve-2020-1464-50091a1f98bd","tags":["Exploit","Third Party Advisory"]},{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1464","tags":["Patch","Vendor Advisory"]},{"url":"https://blog.virustotal.com/2019/01/distribution-of-malicious-jar-appended.html","tags":["Third Party Advisory"]},{"url":"https://krebsonsecurity.com/2020/08/microsoft-put-off-fixing-zero-day-for-2-years/","tags":["Issue Tracking","Third Party Advisory"]},{"url":"https://medium.com/%40TalBeerySec/glueball-the-story-of-cve-2020-1464-50091a1f98bd","tags":["Exploit","Third Party Advisory"]},{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1464","tags":["Patch","Vendor Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-1464","tags":["US Government Resource"]}],"techniques":[{"id":"T1211","name":"Exploitation for Stealth","tactics":["stealth"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: bypassing defenses enables the initial foothold","mappingType":"exploitation_technique","evidence":[{"from":"description","quote":"could bypass security features","start":142,"end":172}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"},{"id":"T1553","name":"Subvert Trust Controls","tactics":["defense-impairment"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: forged signature validation enables unsigned code trust","mappingType":"primary_impact","evidence":[{"from":"description","quote":"incorrectly validates file signatures","start":45,"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-2020-12339","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2020-12339","exploited":true,"exploitedSince":"2021-11-03","provenance":"source"},"exploits":[],"exploitSources":null,"exploitRefs":["https://medium.com/%40TalBeerySec/glueball-the-story-of-cve-2020-1464-50091a1f98bd"],"flow":[{"stage":"exploitation","techniques":["T1211"],"provenance":"ai"},{"stage":"primary","techniques":["T1553"],"provenance":"ai"}],"timeline":[{"date":"2020-08-11","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV evidence)","url":"https://api.msrc.microsoft.com/cvrf/v3.0/cvrf/2020-Aug","provenance":"source"},{"date":"2020-08-17","kind":"published","label":"Published (NVD)","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-1464","provenance":"source"},{"date":"2021-11-03","kind":"kev","label":"Added to CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","provenance":"source"},{"date":"2021-11-03","kind":"euvd-exploited","label":"ENISA EUVD: exploited","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2020-12339","provenance":"source"}],"speed":{"daysToPublicExploit":null,"firstExploitFrom":null,"daysToKev":443},"priority":{"score":68.2,"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 2270 days ago"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":19.72,"detail":"percentile 0.9859"},{"name":"Named in threat reports","points":0.0,"detail":"0 reports"},{"name":"Public exploit code","points":5.0,"detail":"1 NVD reference 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"}]}}