{"id":"CVE-2020-15999","published":"2020-11-03T03:15:14Z","modified":"2026-06-17T02:57:36Z","title":"Google Chrome FreeType Heap Buffer Overflow Vulnerability","vendor":"Google","product":"Chrome FreeType","tier":"core","eol":null,"description":{"text":"Heap buffer overflow in Freetype in Google Chrome prior to 86.0.4240.111 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.","provenance":"source","from":"NVD"},"summary":{"text":"The Freetype font rendering component in Google Chrome contains a heap buffer overflow that can lead to heap corruption. An attacker who can get a victim to open a crafted HTML page can potentially exploit this flaw, requiring only network delivery of the page and user interaction (visiting the page) with no authentication.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-30T13:36:22Z"},"cvss":{"score":9.6,"severity":"CRITICAL","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","provenance":"source","from":"NVD"},"epss":{"score":0.63894,"percentile":0.9922,"date":"2026-10-29","provenance":"source"},"kev":{"dateAdded":"2021-11-03","dueDate":"2021-11-17","ransomware":false,"requiredAction":"Apply updates per vendor instructions.","notes":"https://nvd.nist.gov/vuln/detail/CVE-2020-15999","provenance":"source"},"vulncheckKev":{"dateAdded":"2020-10-19","exploitedFirstSeen":"2020-10-19","ransomware":false,"evidence":[{"url":"https://docs.google.com/spreadsheets/d/1lkNJ0uQwbeC1ZTRrxdtuPLCIl7mlUreoKfSIgajnSyY/edit","date":"2020-10-19"},{"url":"https://savannah.nongnu.org/bugs/?59308","date":"2020-10-19"},{"url":"https://chromereleases.googleblog.com/2020/10/stable-channel-update-for-desktop_20.html","date":"2020-10-20"},{"url":"https://googleprojectzero.github.io/0days-in-the-wild//0day-RCAs/2020/CVE-2020-16009.html","date":"2021-02-04"},{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2021-11-03"},{"url":"https://www.ox.security/wp-content/uploads/2025/05/The-KEV-Illusion-Separating-True-Threats-from-Pretend-Critical-Risks-v4.pdf","date":"2025-05-30"}],"evidenceTotal":6,"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-787","name":"Out-of-bounds Write"},{"id":"CWE-120","name":"Buffer Copy without Checking Size of Input"}],"references":[{"url":"http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00016.html","tags":["Broken Link","Mailing List","Third Party Advisory"]},{"url":"http://seclists.org/fulldisclosure/2020/Nov/33","tags":["Mailing List","Not Applicable","Third Party Advisory"]},{"url":"https://chromereleases.googleblog.com/2020/10/stable-channel-update-for-desktop_20.html","tags":["Third Party Advisory"]},{"url":"https://crbug.com/1139963","tags":["Exploit","Issue Tracking","Third Party Advisory"]},{"url":"https://googleprojectzero.blogspot.com/p/rca-cve-2020-15999.html","tags":["Exploit","Third Party Advisory"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/J3QVIGAAJ4D62YEJAJJWMCCBCOQ6TVL7/","tags":["Release Notes"]},{"url":"https://security.gentoo.org/glsa/202011-12","tags":["Third Party Advisory"]},{"url":"https://security.gentoo.org/glsa/202012-04","tags":["Third Party Advisory"]},{"url":"https://security.gentoo.org/glsa/202401-19","tags":["Third Party Advisory"]},{"url":"https://www.debian.org/security/2021/dsa-4824","tags":["Mailing List","Third Party Advisory"]},{"url":"http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00016.html","tags":["Broken Link","Mailing List","Third Party Advisory"]},{"url":"http://seclists.org/fulldisclosure/2020/Nov/33","tags":["Mailing List","Not Applicable","Third Party Advisory"]},{"url":"https://chromereleases.googleblog.com/2020/10/stable-channel-update-for-desktop_20.html","tags":["Third Party Advisory"]},{"url":"https://crbug.com/1139963","tags":["Exploit","Issue Tracking","Third Party Advisory"]},{"url":"https://googleprojectzero.blogspot.com/p/rca-cve-2020-15999.html","tags":["Exploit","Third Party Advisory"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/J3QVIGAAJ4D62YEJAJJWMCCBCOQ6TVL7/","tags":["Release Notes"]},{"url":"https://security.gentoo.org/glsa/202011-12","tags":["Third Party Advisory"]},{"url":"https://security.gentoo.org/glsa/202012-04","tags":["Third Party Advisory"]},{"url":"https://security.gentoo.org/glsa/202401-19","tags":["Third Party Advisory"]},{"url":"https://security.netapp.com/advisory/ntap-20240812-0001/","tags":["Third Party Advisory"]},{"url":"https://www.debian.org/security/2021/dsa-4824","tags":["Mailing List","Third Party Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-15999","tags":["US Government Resource"]}],"techniques":[{"id":"T1189","name":"Drive-by Compromise","tactics":["initial-access"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: Malicious webpage delivers exploit to victim browser","mappingType":"exploitation_technique","evidence":[{"from":"description","quote":"via a crafted HTML page","start":138,"end":161}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"},{"id":"T1203","name":"Exploitation for Client Execution","tactics":["execution"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: Heap overflow in browser yields code execution","mappingType":"primary_impact","evidence":[{"from":"description","quote":"Heap buffer overflow in Freetype in Google Chrome","start":0,"end":49}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"}],"reports":[],"affected":[{"ecosystem":"NuGet","package":"CefSharp.Common","vulnerableRanges":["<85.3.130"],"patched":["85.3.130"],"from":["GHSA-pv36-h7jh-qm62"],"provenance":"source"},{"ecosystem":"NuGet","package":"CefSharp.Wpf","vulnerableRanges":["<85.3.130"],"patched":["85.3.130"],"from":["GHSA-pv36-h7jh-qm62"],"provenance":"source"},{"ecosystem":"NuGet","package":"CefSharp.WinForms","vulnerableRanges":["<85.3.130"],"patched":["85.3.130"],"from":["GHSA-pv36-h7jh-qm62"],"provenance":"source"},{"ecosystem":"NuGet","package":"CefSharp.Wpf.HwndHost","vulnerableRanges":["<85.3.130"],"patched":["85.3.130"],"from":["GHSA-pv36-h7jh-qm62"],"provenance":"source"}],"advisories":[{"id":"GHSA-pv36-h7jh-qm62","url":"https://github.com/advisories/GHSA-pv36-h7jh-qm62","severity":"MODERATE","ecosystem":"NuGet","package":"CefSharp.Common","vulnerableRanges":["<85.3.130"],"patched":["85.3.130"],"provenance":"source","from":"GHSA"},{"id":"GHSA-pv36-h7jh-qm62","url":"https://github.com/advisories/GHSA-pv36-h7jh-qm62","severity":"MODERATE","ecosystem":"NuGet","package":"CefSharp.Wpf","vulnerableRanges":["<85.3.130"],"patched":["85.3.130"],"provenance":"source","from":"GHSA"},{"id":"GHSA-pv36-h7jh-qm62","url":"https://github.com/advisories/GHSA-pv36-h7jh-qm62","severity":"MODERATE","ecosystem":"NuGet","package":"CefSharp.WinForms","vulnerableRanges":["<85.3.130"],"patched":["85.3.130"],"provenance":"source","from":"GHSA"},{"id":"GHSA-pv36-h7jh-qm62","url":"https://github.com/advisories/GHSA-pv36-h7jh-qm62","severity":"MODERATE","ecosystem":"NuGet","package":"CefSharp.Wpf.HwndHost","vulnerableRanges":["<85.3.130"],"patched":["85.3.130"],"provenance":"source","from":"GHSA"}],"euvd":{"id":"EUVD-2020-1435","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2020-1435","exploited":true,"exploitedSince":"2021-11-03","provenance":"source"},"exploits":[],"exploitSources":{"pocGithub":{"count":3,"skipped":0,"earliest":"2020-11-04","earliestUrl":"https://github.com/oxfemale/CVE-2020-15999","repos":[{"name":"oxfemale/CVE-2020-15999","url":"https://github.com/oxfemale/CVE-2020-15999","stars":2,"created":"2020-11-04"},{"name":"Marmeus/CVE-2020-15999","url":"https://github.com/Marmeus/CVE-2020-15999","stars":1,"created":"2020-12-30"},{"name":"maarlo/CVE-2020-15999","url":"https://github.com/maarlo/CVE-2020-15999","stars":0,"created":"2020-12-30"}]},"first":{"date":"2020-11-04","source":"PoC-in-GitHub","url":"https://github.com/oxfemale/CVE-2020-15999"},"provenance":"source"},"exploitRefs":["https://crbug.com/1139963","https://googleprojectzero.blogspot.com/p/rca-cve-2020-15999.html"],"flow":[{"stage":"exploitation","techniques":["T1189"],"provenance":"ai"},{"stage":"primary","techniques":["T1203"],"provenance":"ai"}],"timeline":[{"date":"2020-10-19","kind":"exploited-reported","label":"Exploitation 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KEV"},{"name":"Recent KEV listing","points":0.0,"detail":"added 2202 days ago"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":19.84,"detail":"percentile 0.9922"},{"name":"Named in threat reports","points":0.0,"detail":"0 reports"},{"name":"Public exploit code","points":5.0,"detail":"2 NVD references tagged Exploit; 3 PoC-in-GitHub repos"},{"name":"Mentioned in OTX pulses","points":3.0,"detail":"50 pulses"},{"name":"CVSS severity","points":6.72,"detail":"base score 9.6"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]},"lineage":{"familyId":"fam-class-google-chrome-cwe-787"}}