{"schemaVersion":3,"id":"CVE-2020-9951","aliases":["UBUNTU-CVE-2020-9951","DEBIAN-CVE-2020-9951"],"status":"published","duplicateOf":null,"title":null,"description":"A use after free issue was addressed with improved memory management. This issue is fixed in Safari 14.0. Processing maliciously crafted web content may lead to arbitrary code execution.","dates":{"published":"2020-10-16T16:53:17.000Z","modified":"2024-08-04T10:50:57.013Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":8.8,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"NVD","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":8.8,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","exploitability":7.2,"impact":9.8,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Debian","score":8.8,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","exploitability":7.2,"impact":9.8,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":8.8,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":6.8,"severity":"medium","vector":"AV:N/AC:M/Au:N/C:P/I:P/A:P","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.02333,"percentile":0.83304,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-19T00:00:00.000Z","baselineScore":0.02333},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.02333,"percentile":0.83304}],"last30":[{"date":"2026-09-19T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.02333,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.02333,"percentile":0.83304}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-416","name":"Use After Free","description":"The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory \"belongs\" to the code that operates on the new pointer.","type":"weakness","status":"Stable","abstraction":"Variant","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/416.html"}],"affected":[{"vendor":"apple","product":"icloud","name":"icloud","label":"icloud","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 11.5","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 11.5","eol":null,"hubHref":"/vendor/apple/icloud"},{"vendor":"apple","product":"ipados","name":"ipados","label":"ipados","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 14.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 14.0","eol":{"isEol":null,"eolDate":null,"matchMethod":"cpe","cycle":null,"product":{"name":"ipados","label":"Apple iPadOS","category":"os"}},"hubHref":"/vendor/apple/ipados"},{"vendor":"apple","product":"iphone_os","name":"iphone os","label":"iphone_os","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 14.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 14.0","eol":{"isEol":null,"eolDate":null,"matchMethod":"cpe","cycle":null,"product":{"name":"ios","label":"Apple iOS","category":"os"}},"hubHref":"/vendor/apple/iphone_os"},{"vendor":"apple","product":"itunes","name":"itunes","label":"itunes","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 12.10.9","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 12.10.9","eol":null,"hubHref":"/vendor/apple/itunes"},{"vendor":"apple","product":"safari","name":"safari","label":"safari","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ unspecified, < Safari 14.0","noFixRecorded":false,"fixedIn":null},{"text":"< 14.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ unspecified, < Safari 14.0 | < 14.0","eol":null,"hubHref":"/vendor/apple/safari"},{"vendor":"apple","product":"tvos","name":"tvos","label":"tvos","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 14.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 14.0","eol":{"isEol":null,"eolDate":null,"matchMethod":"cpe","cycle":null,"product":{"name":"tvos","label":"Apple tvOS","category":"os"}},"hubHref":"/vendor/apple/tvos"},{"vendor":"apple","product":"watchos","name":"watchos","label":"watchos","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 7.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 7.0","eol":null,"hubHref":"/vendor/apple/watchos"},{"vendor":"debian","product":"webkit2gtk","name":"webkit2gtk","label":"webkit2gtk","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/webkit2gtk","purlType":"deb","versions":[{"text":"< 2.30.1-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.30.1-1","eol":null,"hubHref":null},{"vendor":"debian","product":"wpewebkit","name":"wpewebkit","label":"wpewebkit","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/wpewebkit","purlType":"deb","versions":[{"text":"< 2.30.0-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.30.0-1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"qtwebkit-opensource-src","name":"qtwebkit-opensource-src","label":"qtwebkit-opensource-src","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/qtwebkit-opensource-src","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"qtwebkit-source","name":"qtwebkit-source","label":"qtwebkit-source","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/qtwebkit-source","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"webkit2gtk","name":"webkit2gtk","label":"webkit2gtk","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/webkit2gtk","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null},{"text":"< 2.30.3-0ubuntu0.18.04.1","noFixRecorded":false,"fixedIn":null},{"text":"< 2.30.3-0ubuntu0.20.04.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"All versions (No fix recorded) | < 2.30.3-0ubuntu0.18.04.1 | < 2.30.3-0ubuntu0.20.04.1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"webkitgtk","name":"webkitgtk","label":"webkitgtk","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/webkitgtk","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"wpewebkit","name":"wpewebkit","label":"wpewebkit","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/wpewebkit","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"debian","product":"debian_linux","name":"debian linux","label":"debian_linux","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"10.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"10.0","eol":{"isEol":true,"eolDate":"2024-06-30T00:00:00.000Z","matchMethod":"cpe","cycle":{"name":"10","label":"10 (Buster)","eolFrom":"2024-06-30T00:00:00.000Z","isLts":false,"isMaintained":true,"latestVersion":"10.13"},"product":{"name":"debian","label":"Debian","category":"os"}},"hubHref":"/vendor/debian/debian_linux"},{"vendor":"webkit","product":"webkitgtk\\+","name":"webkitgtk\\+","label":"webkitgtk\\+","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≤ 2.30.3","noFixRecorded":false,"fixedIn":null}],"versionsText":"≤ 2.30.3","eol":null,"hubHref":"/vendor/webkit/webkitgtk"}],"affectedCount":16,"eol":{"hasEol":true,"count":1},"references":[{"url":"https://support.apple.com/kb/HT211843","label":"support.apple.com/kb/HT211843","hostname":"support.apple.com","tags":["X Refsource CONFIRM","Vendor Advisory"]},{"url":"https://support.apple.com/kb/HT211850","label":"support.apple.com/kb/HT211850","hostname":"support.apple.com","tags":["X Refsource CONFIRM","Vendor Advisory"]},{"url":"https://support.apple.com/kb/HT211844","label":"support.apple.com/kb/HT211844","hostname":"support.apple.com","tags":["X Refsource CONFIRM","Vendor Advisory"]},{"url":"https://support.apple.com/HT211845","label":"support.apple.com/HT211845","hostname":"support.apple.com","tags":["X Refsource MISC","Release Notes","Vendor Advisory"]},{"url":"https://support.apple.com/kb/HT211952","label":"support.apple.com/kb/HT211952","hostname":"support.apple.com","tags":["X Refsource CONFIRM","Vendor Advisory"]},{"url":"http://seclists.org/fulldisclosure/2020/Nov/18","label":"seclists.org/fulldisclosure/2020/Nov/18","hostname":"seclists.org","tags":["Mailing List","X Refsource FULLDISC","Third Party Advisory"]},{"url":"http://seclists.org/fulldisclosure/2020/Nov/19","label":"seclists.org/fulldisclosure/2020/Nov/19","hostname":"seclists.org","tags":["Mailing List","X Refsource FULLDISC","Third Party Advisory"]},{"url":"http://seclists.org/fulldisclosure/2020/Nov/20","label":"seclists.org/fulldisclosure/2020/Nov/20","hostname":"seclists.org","tags":["Mailing List","X Refsource FULLDISC","Third Party Advisory"]},{"url":"http://seclists.org/fulldisclosure/2020/Nov/22","label":"seclists.org/fulldisclosure/2020/Nov/22","hostname":"seclists.org","tags":["Mailing List","X Refsource FULLDISC","Third Party Advisory"]},{"url":"http://www.openwall.com/lists/oss-security/2020/11/23/3","label":"www.openwall.com/lists/oss-security/2020/11/23/3","hostname":"www.openwall.com","tags":["Mailing List","X Refsource MLIST","Third Party Advisory"]},{"url":"https://www.debian.org/security/2020/dsa-4797","label":"www.debian.org/security/2020/dsa-4797","hostname":"www.debian.org","tags":["Vendor Advisory","X Refsource DEBIAN","Third Party Advisory"]},{"url":"https://support.apple.com/kb/HT211935","label":"support.apple.com/kb/HT211935","hostname":"support.apple.com","tags":["X Refsource CONFIRM","Vendor Advisory"]},{"url":"https://security.gentoo.org/glsa/202012-10","label":"security.gentoo.org/glsa/202012-10","hostname":"security.gentoo.org","tags":["Vendor Advisory","X Refsource GENTOO","Third Party Advisory"]},{"url":"https://ubuntu.com/security/CVE-2020-9951","label":"ubuntu.com/security/CVE-2020-9951","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://webkitgtk.org/security/WSA-2020-0008.html","label":"webkitgtk.org/security/WSA-2020-0008.html","hostname":"webkitgtk.org","tags":["REPORT"]},{"url":"https://ubuntu.com/security/notices/USN-4648-1","label":"ubuntu.com/security/notices/USN-4648-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2020-9951","label":"www.cve.org/CVERecord?id=CVE-2020-9951","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2020-9951","label":"security-tracker.debian.org/tracker/CVE-2020-9951","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":["DSA-4797-1","MGASA-2020-0441","OPENSUSE-SU-2020:2304-1","OPENSUSE-SU-2020:2310-1","OPENSUSE-SU-2022:0182-1","RHSA-2021:1586","RHSA-2025:10364","SUSE-SU-2020:3864-1","SUSE-SU-2020:3867-1","SUSE-SU-2021:1990-1","SUSE-SU-2022:0142-1","SUSE-SU-2022:0182-1","SUSE-SU-2022:0182-2","SUSE-SU-2022:0183-1","USN-4648-1"],"duplicates":[],"related":["OPENSUSE-SU-2020:2304-1","OPENSUSE-SU-2020:2310-1","OPENSUSE-SU-2022:0182-1","SUSE-SU-2020:3864-1","SUSE-SU-2020:3867-1","SUSE-SU-2021:1990-1","SUSE-SU-2022:0142-1","SUSE-SU-2022:0182-1","SUSE-SU-2022:0182-2","SUSE-SU-2022:0183-1","USN-4648-1"]},"timeline":[{"kind":"published","date":"2020-10-16T16:53:17.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-08-04T10:50:57.013Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":36,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-19T23:28:53.845Z","stale":false,"partial":false}}