{"id":"CVE-2014-1776","published":"2014-04-27T10:55:03Z","modified":"2026-06-17T00:05:32Z","title":"Microsoft Internet Explorer Memory Corruption Vulnerability","vendor":"Microsoft","product":"Internet Explorer","tier":"core","eol":{"product":"Internet Explorer","since":"2022-06-15","note":"No security updates; remove it."},"description":{"text":"Use-after-free vulnerability in Microsoft Internet Explorer 6 through 11 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via vectors related to the CMarkup::IsConnectedToPrimaryMarkup function, as exploited in the wild in April 2014.  NOTE: this issue originally emphasized VGX.DLL, but Microsoft clarified that \"VGX.DLL does not contain the vulnerable code leveraged in this exploit. Disabling VGX.DLL is an exploit-specific workaround that provides an immediate, effective workaround to help block known attacks.\"","provenance":"source","from":"NVD"},"summary":{"text":"Microsoft Internet Explorer versions 6 through 11 contain a use-after-free memory corruption flaw in the CMarkup::IsConnectedToPrimaryMarkup function. A remote attacker can exploit it to execute arbitrary code or cause a denial of service, with the attack vector being network-based and requiring no privileges or user interaction.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-23T07:01:09Z"},"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":0.82682,"percentile":0.99665,"date":"2026-10-28","provenance":"source"},"kev":{"dateAdded":"2022-01-28","dueDate":"2022-07-28","ransomware":false,"requiredAction":"Apply updates per vendor instructions.","notes":"https://learn.microsoft.com/en-us/security-updates/SecurityBulletins/2014/ms14-021?redirectedfrom=MSDN; https://nvd.nist.gov/vuln/detail/CVE-2014-1776","provenance":"source"},"vulncheckKev":{"dateAdded":"2014-04-27","exploitedFirstSeen":"2014-04-27","ransomware":false,"evidence":[{"url":"https://www.cve.org/CVERecord?id=CVE-2014-1776","date":"2014-04-27"},{"url":"https://cyberwarzone.com/wp-content/uploads/2019/02/ReportGlobalThreatIntelligence.pdf","date":"2015-02-06"},{"url":"https://www.recordedfuture.com/russian-apt-toolkits","date":"2016-08-04"},{"url":"https://web.archive.org/web/20160910124439/http://www.symantec.com/connect/blogs/buckeye-cyberespionage-group-shifts-gaze-us-hong-kong","date":"2016-09-06"},{"url":"https://cisa.gov/news-events/alerts/2015/04/29/top-30-targeted-high-risk-vulnerabilities","date":"2016-09-29"},{"url":"https://www.us-cert.gov/ncas/alerts/TA15-119A","date":"2016-09-29"},{"url":"https://symantec-enterprise-blogs.security.com/blogs/threat-intelligence/buckeye-windows-zero-day-exploit","date":"2019-05-06"},{"url":"https://marcoramilli.com/2019/12/05/apt28-attacks-evolution/","date":"2019-12-05"},{"url":"https://www.scribd.com/document/516749423/inzimam-2019-ijca-919742","date":"2019-12-26"},{"url":"https://dl.acm.org/doi/pdf/10.1145/3465481.3465758","date":"2021-08-17"}],"evidenceTotal":12,"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-416","name":"Use After Free"}],"references":[{"url":"http://blogs.technet.com/b/srd/archive/2014/04/30/protection-strategies-for-the-security-advisory-2963983-ie-0day.aspx","tags":["Broken Link","Mitigation"]},{"url":"http://secunia.com/advisories/57908","tags":["Broken Link"]},{"url":"http://securitytracker.com/id?1030154","tags":["Broken Link","Third Party Advisory","VDB Entry"]},{"url":"http://www.fireeye.com/blog/uncategorized/2014/04/new-zero-day-exploit-targeting-internet-explorer-versions-9-through-11-identified-in-targeted-attacks.html","tags":["Broken 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Entry"]},{"url":"http://www.fireeye.com/blog/uncategorized/2014/04/new-zero-day-exploit-targeting-internet-explorer-versions-9-through-11-identified-in-targeted-attacks.html","tags":["Broken Link"]},{"url":"http://www.kb.cert.org/vuls/id/222929","tags":["Mitigation","Third Party Advisory","US Government Resource"]},{"url":"http://www.osvdb.org/106311","tags":["Broken Link"]},{"url":"http://www.securityfocus.com/bid/67075","tags":["Broken Link","Third Party Advisory","VDB Entry"]},{"url":"http://www.signalsec.com/cve-2014-1776-ie-0day-analysis/","tags":["Exploit","Third Party Advisory"]},{"url":"https://docs.microsoft.com/en-us/security-updates/securitybulletins/2014/ms14-021","tags":["Patch","Vendor Advisory"]},{"url":"https://technet.microsoft.com/library/security/2963983","tags":["Mitigation","Patch","Vendor Advisory"]},{"url":"https://www.vicarius.io/vsociety/posts/cve-2014-1776-use-after-free-vulnerability-in-microsoft-internet-explorer-detection-script","tags":["Third Party 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Execution","tactics":["execution"],"provenance":"source","basis":"ctid-cve","bases":["ctid-cve"],"basisDetail":"CTID attack_to_cve (Phase 1)","mappingType":"uncategorized","evidence":[],"confidence":"low","confidenceNote":"server-side bug exploitable without user interaction; client-execution technique does not fit"},{"id":"T1499","name":"Endpoint Denial of Service","tactics":["impact"],"provenance":"source","basis":"ctid-cve","bases":["ctid-cve"],"basisDetail":"CTID attack_to_cve (Phase 1)","mappingType":"uncategorized","evidence":[],"confidence":"low","confidenceNote":"CTID attack_to_cve Phase 1 \"Uncategorized\" mapping (not staged by impact)"},{"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 after memory corruption","mappingType":"primary_impact","evidence":[{"from":"description","quote":"allows remote attackers to execute arbitrary code","start":73,"end":122}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"},{"id":"T1499.004","name":"Application or System Exploitation","tactics":["impact"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: use-after-free can crash browser","mappingType":"primary_impact","evidence":[{"from":"description","quote":"cause a denial of service (memory corruption)","start":126,"end":171}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"}],"reports":[{"id":"SRC-bc9af9dd604bcbbd89cd","title":"RECON MTL 2017 evolution of pirpi","publisher":"recon.cx","url":"https://recon.cx/2017/montreal/resources/slides/RECON-MTL-2017-evolution_of_pirpi.pdf","date":null,"mentions":[{"quote":"• (CVE-2014-1776)","start":497,"end":514}]},{"id":"SRC-619721166ae9d9d7fdcd","title":"Microsoft Security","publisher":"download.microsoft.com","url":"https://download.microsoft.com/download/4/4/C/44CDEF0E-7924-4787-A56A-16261691ACE3/Microsoft_Security_Intelligence_Report_Volume_19_English.pdf","date":null,"mentions":[{"quote":"CVE-2014-1776","start":26543,"end":26556}]}],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2014-1850","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2014-1850","exploited":true,"exploitedSince":"2022-01-28","provenance":"source"},"exploits":[],"exploitSources":null,"exploitRefs":["http://www.signalsec.com/cve-2014-1776-ie-0day-analysis/"],"flow":[{"stage":"primary","techniques":["T1059","T1499.004"],"provenance":"ai"},{"stage":"related","techniques":["T1189","T1203","T1499"],"provenance":"source","lowConfidence":true}],"timeline":[{"date":"2014-04-27","kind":"published","label":"Published (NVD)","url":"https://nvd.nist.gov/vuln/detail/CVE-2014-1776","provenance":"source"},{"date":"2014-04-27","kind":"exploited-reported","label":"Exploitation 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