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Vulnerability record · CVE-2009-2477 · published 15 July 2009

CVE-2009-2477: Mozilla firefox code injection vulnerability

Mozilla · Firefox

js/src/jstracer.cpp in the Just-in-time (JIT) JavaScript compiler (aka TraceMonkey) in Mozilla Firefox 3.5 before 3.5.1 allows remote attackers to execute arbitrary code via certain use of the escape function that triggers access to uninitialized memory locations, as originally demonstrated by a document containing P and FONT elements.

9.3 CVSS 2.0 High EPSS 43% · top 1.3% CWE-94 · Code injection
9.3CVSS 2.0 base score
43%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
30References, 2 tagged exploit
16 Jun 2026Last modified by NVD

Description

js/src/jstracer.cpp in the Just-in-time (JIT) JavaScript compiler (aka TraceMonkey) in Mozilla Firefox 3.5 before 3.5.1 allows remote attackers to execute arbitrary code via certain use of the escape function that triggers access to uninitialized memory locations, as originally demonstrated by a document containing P and FONT elements.

AV:N/AC:M/Au:N/C:C/I:C/A:C

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://blog.mozilla.com/security/2009/07/14/critical-javascript-vulnerability-in-firefox-35/
http://isc.sans.org/diary.html?storyid=6796
http://secunia.com/advisories/35798 Vendor Advisory
http://sunsolve.sun.com/search/document.do?assetkey=1-66-266148-1
http://voices.washingtonpost.com/securityfix/2009/07/stopgap_fix_for_critical_firef.html
http://www.exploit-db.com/exploits/9137
http://www.exploit-db.com/exploits/9181
http://www.h-online.com/security/First-Zero-Day-Exploit-for-Firefox-3-5--/news/113761
http://www.kb.cert.org/vuls/id/443060 US Government Resource
http://www.mozilla.org/security/announce/2009/mfsa2009-41.html PatchVendor Advisory
http://www.securityfocus.com/bid/35660 Exploit
http://www.vupen.com/english/advisories/2009/1868 PatchVendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=503286
https://www.exploit-db.com/exploits/40936/
https://www.redhat.com/archives/fedora-package-announce/2009-July/msg00909.html
http://blog.mozilla.com/security/2009/07/14/critical-javascript-vulnerability-in-firefox-35/
http://isc.sans.org/diary.html?storyid=6796
http://secunia.com/advisories/35798 Vendor Advisory
http://sunsolve.sun.com/search/document.do?assetkey=1-66-266148-1
http://voices.washingtonpost.com/securityfix/2009/07/stopgap_fix_for_critical_firef.html
http://www.exploit-db.com/exploits/9137
http://www.exploit-db.com/exploits/9181
http://www.h-online.com/security/First-Zero-Day-Exploit-for-Firefox-3-5--/news/113761
http://www.kb.cert.org/vuls/id/443060 US Government Resource
http://www.mozilla.org/security/announce/2009/mfsa2009-41.html PatchVendor Advisory
http://www.securityfocus.com/bid/35660 Exploit
http://www.vupen.com/english/advisories/2009/1868 PatchVendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=503286
https://www.exploit-db.com/exploits/40936/
https://www.redhat.com/archives/fedora-package-announce/2009-July/msg00909.html

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2009-2477), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.