{"id":"CVE-2021-21779","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-21779","generatedAt":"2026-10-27T22:25:58.479Z","title":"A use-after-free vulnerability exists in the way Webkit’s GraphicsContext handles certain events in WebKitGTK 2.30.4.","description":"A use-after-free vulnerability exists in the way Webkit’s GraphicsContext handles certain events in WebKitGTK 2.30.4. A specially crafted web page can lead to a potential information leak and further memory corruption. A victim must be tricked into visiting a malicious web page to trigger this vulnerability.","published":"2021-07-08T12:15:10.000Z","lastModified":"2026-06-17T03:36:06.000Z","status":"Modified","sourceIdentifier":"talos-cna@cisco.com","cvss":{"version":"3.1","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"},"cwe":["CWE-416"],"affected":["webkitgtk/webkitgtk","fedoraproject/fedora","debian/debian linux"],"epss":{"score":0.02924,"percentile":0.86958,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (2.92%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"http://www.openwall.com/lists/oss-security/2021/07/23/1","tags":["Mailing List"],"source":"talos-cna@cisco.com"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KYMMBQN4PRVDLMIJT2LY2BWHLYBD57P3/","source":"talos-cna@cisco.com"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/V4QORERLPDN3UNNJFJSOMHZZCU2G75Q6/","source":"talos-cna@cisco.com"},{"url":"https://talosintelligence.com/vulnerability_reports/TALOS-2021-1238","tags":["Exploit","Third Party Advisory"],"source":"talos-cna@cisco.com"},{"url":"https://www.debian.org/security/2021/dsa-4945","tags":["Third Party Advisory"],"source":"talos-cna@cisco.com"},{"url":"http://www.openwall.com/lists/oss-security/2021/07/23/1","tags":["Mailing List"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KYMMBQN4PRVDLMIJT2LY2BWHLYBD57P3/","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/V4QORERLPDN3UNNJFJSOMHZZCU2G75Q6/","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://talosintelligence.com/vulnerability_reports/TALOS-2021-1238","tags":["Exploit","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.debian.org/security/2021/dsa-4945","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-21779","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}