{"id":"CVE-2016-4171","published":"2016-06-16T14:59:51Z","modified":"2026-06-17T00:47:02Z","title":"Adobe Flash Player Remote Code Execution Vulnerability","vendor":"Adobe","product":"Flash Player","tier":"core","eol":{"product":"Adobe Flash Player","since":"2020-12-31","note":"No security updates; remove it."},"description":{"text":"Unspecified vulnerability in Adobe Flash Player 21.0.0.242 and earlier allows remote attackers to execute arbitrary code via unknown vectors, as exploited in the wild in June 2016.","provenance":"source","from":"NVD"},"summary":{"text":"Adobe Flash Player, versions 21.0.0.242 and earlier, contains an unspecified flaw whose exact component is not identified in the available details. A remote attacker can execute arbitrary code on the affected system via unknown vectors, without needing network position, credentials, or user interaction beyond what the attack vector requires.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-23T07:10:41Z"},"cvss":{"score":9.8,"severity":"CRITICAL","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","provenance":"source","from":"NVD"},"epss":{"score":0.20055,"percentile":0.97446,"date":"2026-10-31","provenance":"source"},"kev":{"dateAdded":"2022-03-25","dueDate":"2022-04-15","ransomware":false,"requiredAction":"The impacted product is end-of-life and should be disconnected if still in use.","notes":"https://nvd.nist.gov/vuln/detail/CVE-2016-4171","provenance":"source"},"vulncheckKev":{"dateAdded":"2016-06-15","exploitedFirstSeen":"2016-06-15","ransomware":false,"evidence":[{"url":"https://docs.google.com/spreadsheets/d/1lkNJ0uQwbeC1ZTRrxdtuPLCIl7mlUreoKfSIgajnSyY/edit","date":"2016-06-15"},{"url":"https://www.cve.org/CVERecord?id=CVE-2016-4171","date":"2016-06-16"},{"url":"https://securelist.com/operation-daybreak/75100/","date":"2016-06-17"},{"url":"https://dl.acm.org/doi/pdf/10.1145/3465481.3465758","date":"2021-08-17"},{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2022-03-25"}],"evidenceTotal":5,"provenance":"source"},"exploited":true,"otx":{"pulseCount":50,"pulses":[{"name":"Actively_Exploited_Kev | Nov 1, 2026","url":"https://otx.alienvault.com/pulse/6ae6007740c10de9f3c0173d","created":"2026-10-31"},{"name":"Actively_Exploited_Kev | Oct 31, 2026","url":"https://otx.alienvault.com/pulse/6ae4aefab0c2191cecd41862","created":"2026-10-30"},{"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"}],"provenance":"machine"},"cwes":[],"references":[{"url":"http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00031.html","tags":["Mailing List","Third Party Advisory"]},{"url":"http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00035.html","tags":["Mailing List","Third Party Advisory"]},{"url":"http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00038.html","tags":["Mailing List","Third Party Advisory"]},{"url":"http://www.securityfocus.com/bid/91184","tags":["Third Party Advisory","VDB Entry"]},{"url":"http://www.securitytracker.com/id/1036094","tags":["Third Party Advisory","VDB Entry"]},{"url":"https://access.redhat.com/errata/RHSA-2016:1238","tags":["Third Party Advisory"]},{"url":"https://helpx.adobe.com/security/products/flash-player/apsa16-03.html","tags":["Vendor Advisory"]},{"url":"https://helpx.adobe.com/security/products/flash-player/apsb16-18.html","tags":["Vendor Advisory"]},{"url":"https://security.gentoo.org/glsa/201606-08","tags":["Third Party Advisory"]},{"url":"https://www.kb.cert.org/vuls/id/748992","tags":["Third Party Advisory","US Government Resource"]},{"url":"http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00031.html","tags":["Mailing List","Third Party Advisory"]},{"url":"http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00035.html","tags":["Mailing List","Third Party Advisory"]},{"url":"http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00038.html","tags":["Mailing List","Third Party Advisory"]},{"url":"http://www.securityfocus.com/bid/91184","tags":["Third Party Advisory","VDB Entry"]},{"url":"http://www.securitytracker.com/id/1036094","tags":["Third Party Advisory","VDB Entry"]},{"url":"https://access.redhat.com/errata/RHSA-2016:1238","tags":["Third Party Advisory"]},{"url":"https://helpx.adobe.com/security/products/flash-player/apsa16-03.html","tags":["Vendor Advisory"]},{"url":"https://helpx.adobe.com/security/products/flash-player/apsb16-18.html","tags":["Vendor Advisory"]},{"url":"https://security.gentoo.org/glsa/201606-08","tags":["Third Party Advisory"]},{"url":"https://www.kb.cert.org/vuls/id/748992","tags":["Third Party Advisory","US Government Resource"]},{"url":"https://github.com/cisagov/vulnrichment/issues/196","tags":["Issue Tracking"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2016-4171","tags":["US Government Resource"]}],"techniques":[{"id":"T1203","name":"Exploitation for Client Execution","tactics":["execution"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: Flash Player content exploited via client application","mappingType":"exploitation_technique","evidence":[{"from":"description","quote":"allows remote attackers to execute arbitrary code via unknown vectors","start":71,"end":140}],"model":"claude-haiku-5-5","confidence":"low","confidenceNote":"server-side bug exploitable without user interaction; client-execution technique does not fit"},{"id":"T1059","name":"Command and Scripting Interpreter","tactics":["execution"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: Arbitrary code execution is the direct impact","mappingType":"primary_impact","evidence":[{"from":"description","quote":"allows remote attackers to execute arbitrary code","start":71,"end":120}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"}],"reports":[{"id":"SRC-93c55e10ab45afc37c85","title":"Microsoft Security","publisher":"download.microsoft.com","url":"https://download.microsoft.com/download/E/B/0/EB0F50CC-989C-4B66-B7F6-68CD3DC90DE3/Microsoft_Security_Intelligence_Report_Volume_21_English.pdf","date":null,"mentions":[{"quote":"CVE-2016-4171 Flash malformed ExecPolicy tag RCE Adobe Flash APSB16-18 (Jun.","start":119927,"end":120003},{"quote":" CVE-2016-4171 – Flash Player malformed ExecPolicy tag: This zero-day","start":122151,"end":122221},{"quote":"14 Costin Raiu, “CVE-2016-4171 – Adobe Flash Zero-day used in targeted attacks,” Securelist, June 14, 2016,","start":123264,"end":123371},{"quote":"https://securelist.com/blog/research/75082/cve-2016-4171-adobe-flash-zero-day-used-in-targeted-attacks/.","start":123373,"end":123477},{"quote":"64\r\nCVE-2015-0310, 56\r\nCVE-2015-0311, 56\r\nCVE-2015-0313, 56\r\nCVE-2015-5119, 54, 63, 159\r\nCVE-2015-8651, 56, 57\r\nCVE-2016-0034, 66, 67, 69\r\nCVE-2016-0165, 67\r\nCVE-2016-0167, 67, 69\r\nCVE-2016-0189, 67, 70\r\nCVE-2016-1010, 67\r\nCVE-2016-1019, 57, 67, 68\r\nCVE-2016-4117, 22, 23, 24, 25, 29, 57, 67, 68\r\nCVE-2016-4171, 67,","start":261593,"end":261908}]}],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2016-5172","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2016-5172","exploited":true,"exploitedSince":"2022-03-25","provenance":"source"},"exploits":[],"exploitSources":null,"exploitRefs":[],"flow":[{"stage":"primary","techniques":["T1059"],"provenance":"ai"},{"stage":"related","techniques":["T1203"],"provenance":"ai","lowConfidence":true}],"timeline":[{"date":"2016-06-15","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV evidence)","url":"https://docs.google.com/spreadsheets/d/1lkNJ0uQwbeC1ZTRrxdtuPLCIl7mlUreoKfSIgajnSyY/edit","provenance":"source"},{"date":"2016-06-16","kind":"published","label":"Published (NVD)","url":"https://nvd.nist.gov/vuln/detail/CVE-2016-4171","provenance":"source"},{"date":"2022-03-25","kind":"kev","label":"Added to CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","provenance":"source"},{"date":"2022-03-25","kind":"euvd-exploited","label":"ENISA EUVD: exploited","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2016-5172","provenance":"source"}],"speed":{"daysToPublicExploit":null,"firstExploitFrom":null,"daysToKev":2108},"priority":{"score":53.2,"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 3791 days ago"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":19.49,"detail":"percentile 0.9745"},{"name":"Named in threat reports","points":3.87,"detail":"1 report"},{"name":"Public exploit code","points":0.0,"detail":"none found"},{"name":"Mentioned in OTX pulses","points":3.0,"detail":"50 pulses"},{"name":"CVSS severity","points":6.86,"detail":"base score 9.8"},{"name":"End-of-life product","points":-15.0,"detail":"No patches exist; remove or isolate it"}]}}