{"schemaVersion":3,"id":"CVE-2021-30795","aliases":["UBUNTU-CVE-2021-30795","DEBIAN-CVE-2021-30795"],"status":"published","duplicateOf":null,"title":null,"description":"A use after free issue was addressed with improved memory management. This issue is fixed in iOS 14.7, Safari 14.1.2, macOS Big Sur 11.5, watchOS 7.6, tvOS 14.7. Processing maliciously crafted web content may lead to arbitrary code execution.","dates":{"published":"2021-09-08T13:49:42.000Z","modified":"2024-08-03T22:40:32.180Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":9.3,"severity":"high","version":"2.0","versionLabel":"v2.0","source":"NVD","vector":"AV:N/AC:M/Au:N/C:C/I:C/A:C","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":9.3,"severity":"high","vector":"AV:N/AC:M/Au:N/C:C/I:C/A:C","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.02217,"percentile":0.8236,"severity":"low","asOf":"2026-10-18T00:00:00.000Z","change":{"pp":0.07699999999999999,"baselineDate":"2026-09-18T00:00:00.000Z","baselineScore":0.0214},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.0214,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.0214,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.0214,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.0214,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.0214,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.0214,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.0214,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.0214,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.0214,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.0214,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.0214,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.0214,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.0214,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.0214,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.0214,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.0214,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.0214,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.0214,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.0214,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.0214,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.0214,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.02217,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.02217,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.02217,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.02217,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.02217,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.02217,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.02217,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.02217,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.02217,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.02217,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.02217,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.02217,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.02217,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.02217,"percentile":0.8236}],"last30":[{"date":"2026-09-18T00:00:00.000Z","score":0.0214,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.0214,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.0214,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.0214,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.0214,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.0214,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.0214,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.0214,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.0214,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.0214,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.0214,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.0214,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.0214,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.0214,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.0214,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.0214,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.0214,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.02217,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.02217,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.02217,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.02217,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.02217,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.02217,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.02217,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.02217,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.02217,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.02217,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.02217,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.02217,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.02217,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.02217,"percentile":0.8236}]},"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":"ios","name":"iOS","label":"ios","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ unspecified, < 14.7","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ unspecified, < 14.7","eol":null,"hubHref":"/vendor/apple/ios"},{"vendor":"apple","product":"iphone_os","name":"iphone os","label":"iphone_os","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 14.7","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 14.7","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":"macos","name":"macos","label":"macos","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"≥ unspecified, < 11.5","noFixRecorded":false,"fixedIn":null},{"text":"≥ unspecified, < 14.7","noFixRecorded":false,"fixedIn":null},{"text":"≥ unspecified, < 7.6","noFixRecorded":false,"fixedIn":null},{"text":"≥ unspecified, < 14.1","noFixRecorded":false,"fixedIn":null},{"text":"≥ 11.0, < 11.5","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ unspecified, < 11.5 | ≥ unspecified, < 14.7 | ≥ unspecified, < 7.6 | ≥ unspecified, < 14.1 | ≥ 11.0, < 11.5","eol":{"isEol":null,"eolDate":null,"matchMethod":"cpe","cycle":null,"product":{"name":"macos","label":"Apple macOS","category":"os"}},"hubHref":"/vendor/apple/macos"},{"vendor":"apple","product":"safari","name":"safari","label":"safari","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 14.1.2","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 14.1.2","eol":null,"hubHref":"/vendor/apple/safari"},{"vendor":"apple","product":"tvos","name":"tvos","label":"tvos","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 14.7","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 14.7","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":"< 7.6","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 7.6","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":"< 2.32.3-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.32.3-1","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":"< 2.32.3-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.32.3-1","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":"< 2.32.3-0ubuntu0.18.04.1","noFixRecorded":false,"fixedIn":null},{"text":"< 2.32.3-0ubuntu0.20.04.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"All versions (No fix recorded) | < 2.32.3-0ubuntu0.18.04.1 | < 2.32.3-0ubuntu0.20.04.1","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}],"affectedCount":13,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://support.apple.com/en-us/HT212601","label":"support.apple.com/en-us/HT212601","hostname":"support.apple.com","tags":["X Refsource MISC","Vendor Advisory"]},{"url":"https://support.apple.com/en-us/HT212602","label":"support.apple.com/en-us/HT212602","hostname":"support.apple.com","tags":["X Refsource MISC","Vendor Advisory"]},{"url":"https://support.apple.com/en-us/HT212605","label":"support.apple.com/en-us/HT212605","hostname":"support.apple.com","tags":["X Refsource MISC","Vendor Advisory"]},{"url":"https://support.apple.com/en-us/HT212604","label":"support.apple.com/en-us/HT212604","hostname":"support.apple.com","tags":["X Refsource MISC","Vendor Advisory"]},{"url":"https://support.apple.com/en-us/HT212606","label":"support.apple.com/en-us/HT212606","hostname":"support.apple.com","tags":["X Refsource MISC","Vendor Advisory"]},{"url":"https://ubuntu.com/security/CVE-2021-30795","label":"ubuntu.com/security/CVE-2021-30795","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/notices/USN-5024-1","label":"ubuntu.com/security/notices/USN-5024-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-30795","label":"www.cve.org/CVERecord?id=CVE-2021-30795","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-30795","label":"security-tracker.debian.org/tracker/CVE-2021-30795","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":["DSA-4945-1","MGASA-2021-0400","OPENSUSE-SU-2021:1101-1","OPENSUSE-SU-2021:2598-1","RHSA-2021:4381","RHSA-2025:10364","SUSE-SU-2021:2598-1","SUSE-SU-2021:2600-1","SUSE-SU-2021:2762-1","USN-5024-1"],"duplicates":[],"related":["OPENSUSE-SU-2021:1101-1","OPENSUSE-SU-2021:2598-1","SUSE-SU-2021:2598-1","SUSE-SU-2021:2600-1","SUSE-SU-2021:2762-1","USN-5024-1"]},"timeline":[{"kind":"published","date":"2021-09-08T13:49:42.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-08-03T22:40:32.180Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":70,"level":"high","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-19T08:20:24.419Z","stale":false,"partial":false}}