{"id":"CVE-2009-5017","url":"https://www.cyber-defence.io/tools/cve/CVE-2009-5017","generatedAt":"2026-10-27T20:40:44.354Z","title":"Mozilla Firefox before 3.6 Beta 3 does not properly handle overlong UTF-8 encoding, which makes it easier for remote attackers to bypass cross-site scripting (XSS) protection mechanisms via a crafted string, a different vulnerability than CVE-2010-1210.","description":"Mozilla Firefox before 3.6 Beta 3 does not properly handle overlong UTF-8 encoding, which makes it easier for remote attackers to bypass cross-site scripting (XSS) protection mechanisms via a crafted string, a different vulnerability than CVE-2010-1210.","published":"2010-11-12T22:00:02.000Z","lastModified":"2026-06-16T23:14:50.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"2.0","score":4.3,"severity":"MEDIUM","vector":"AV:N/AC:M/Au:N/C:N/I:P/A:N"},"cwe":["CWE-79"],"affected":["mozilla/firefox"],"epss":{"score":0.01831,"percentile":0.78726,"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":"low","text":"Lower severity and a low EPSS score (1.83%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"http://hg.mozilla.org/releases/mozilla-1.9.2/rev/e42c563313a0","source":"cve@mitre.org"},{"url":"http://sirdarckcat.blogspot.com/2009/10/couple-of-unicode-issues-on-php-and.html","tags":["Exploit"],"source":"cve@mitre.org"},{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=511859","tags":["Patch"],"source":"cve@mitre.org"},{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=522634","source":"cve@mitre.org"},{"url":"http://hg.mozilla.org/releases/mozilla-1.9.2/rev/e42c563313a0","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://sirdarckcat.blogspot.com/2009/10/couple-of-unicode-issues-on-php-and.html","tags":["Exploit"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=511859","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=522634","source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2009-5017","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."}