{"id":"CVE-2009-3978","url":"https://www.cyber-defence.io/tools/cve/CVE-2009-3978","generatedAt":"2026-10-27T19:39:24.539Z","title":"The nsGIFDecoder2::GifWrite function in decoders/gif/nsGIFDecoder2.cpp in libpr0n in Mozilla Firefox before 3.5.5 allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via an animated GIF file with a large…","description":"The nsGIFDecoder2::GifWrite function in decoders/gif/nsGIFDecoder2.cpp in libpr0n in Mozilla Firefox before 3.5.5 allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via an animated GIF file with a large image size, a different vulnerability than CVE-2009-3373.","published":"2009-11-19T00:30:00.000Z","lastModified":"2026-06-16T23:12:45.000Z","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:N/A:P"},"cwe":[],"affected":["mozilla/firefox"],"epss":{"score":0.01788,"percentile":0.78191,"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 (1.79%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"http://hg.mozilla.org/releases/mozilla-1.9.1/rev/edf189567edc","source":"cve@mitre.org"},{"url":"http://www.h-online.com/open/news/item/Mozilla-fixes-critical-bugs-with-Firefox-3-5-5-852070.html","tags":["Patch"],"source":"cve@mitre.org"},{"url":"http://www.mozilla.com/en-US/firefox/3.5.5/releasenotes/","tags":["Patch"],"source":"cve@mitre.org"},{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=525326","source":"cve@mitre.org"},{"url":"https://wiki.mozilla.org/Releases/Firefox_3.5.5/Test_Plan","tags":["Patch"],"source":"cve@mitre.org"},{"url":"http://hg.mozilla.org/releases/mozilla-1.9.1/rev/edf189567edc","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.h-online.com/open/news/item/Mozilla-fixes-critical-bugs-with-Firefox-3-5-5-852070.html","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.mozilla.com/en-US/firefox/3.5.5/releasenotes/","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=525326","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://wiki.mozilla.org/Releases/Firefox_3.5.5/Test_Plan","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2009-3978","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."}