{"id":"CVE-2012-3989","url":"https://www.cyber-defence.io/tools/cve/CVE-2012-3989","generatedAt":"2026-10-28T03:22:18.591Z","title":"Mozilla Firefox before 16.0, Thunderbird before 16.0, and SeaMonkey before 2.13 do not properly perform a cast of an unspecified variable during use of the instanceof operator on a JavaScript object, which allows remote attackers to execute arbitrary…","description":"Mozilla Firefox before 16.0, Thunderbird before 16.0, and SeaMonkey before 2.13 do not properly perform a cast of an unspecified variable during use of the instanceof operator on a JavaScript object, which allows remote attackers to execute arbitrary code or cause a denial of service (assertion failure) via a crafted web site.","published":"2012-10-10T17:55:02.000Z","lastModified":"2026-06-16T23:44:13.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"2.0","score":9.3,"severity":"HIGH","vector":"AV:N/AC:M/Au:N/C:C/I:C/A:C"},"cwe":["CWE-119"],"affected":["mozilla/firefox","mozilla/seamonkey","mozilla/thunderbird","canonical/ubuntu linux","suse/linux enterprise desktop","suse/linux enterprise server"],"epss":{"score":0.03464,"percentile":0.88969,"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 (3.46%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"http://lists.opensuse.org/opensuse-security-announce/2012-10/msg00010.html","tags":["Mailing List","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"http://osvdb.org/86097","tags":["Broken Link"],"source":"cve@mitre.org"},{"url":"http://secunia.com/advisories/50856","tags":["Broken Link"],"source":"cve@mitre.org"},{"url":"http://secunia.com/advisories/50892","tags":["Broken Link"],"source":"cve@mitre.org"},{"url":"http://secunia.com/advisories/50904","tags":["Broken Link"],"source":"cve@mitre.org"},{"url":"http://secunia.com/advisories/50935","tags":["Broken Link"],"source":"cve@mitre.org"},{"url":"http://secunia.com/advisories/50984","tags":["Broken Link"],"source":"cve@mitre.org"},{"url":"http://www.mozilla.org/security/announce/2012/mfsa2012-80.html","tags":["Vendor Advisory"],"source":"cve@mitre.org"},{"url":"http://www.ubuntu.com/usn/USN-1611-1","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=783867","tags":["Issue Tracking","Vendor Advisory"],"source":"cve@mitre.org"},{"url":"https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16814","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"http://lists.opensuse.org/opensuse-security-announce/2012-10/msg00010.html","tags":["Mailing List","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://osvdb.org/86097","tags":["Broken Link"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://secunia.com/advisories/50856","tags":["Broken Link"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://secunia.com/advisories/50892","tags":["Broken Link"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://secunia.com/advisories/50904","tags":["Broken Link"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://secunia.com/advisories/50935","tags":["Broken Link"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://secunia.com/advisories/50984","tags":["Broken Link"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.mozilla.org/security/announce/2012/mfsa2012-80.html","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.ubuntu.com/usn/USN-1611-1","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=783867","tags":["Issue Tracking","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16814","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2012-3989","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."}