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    CVE-2009-2477

    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.

    Published:Jul 14, 2009
    Last Modified:Apr 23, 2026
    EPS:Jul 15, 2009
    EPSS Score:0.83306
    CVSS Score:9.3

    Affected Products

    Vendor
    Mozilla
    Product
    Firefox

    Exploits

    http://www.securityfocus.com/bid/35660http://www.securityfocus.com/bid/35660https://www.exploit-db.com/exploits/40936https://www.exploit-db.com/exploits/16299https://www.exploit-db.com/exploits/9137https://www.exploit-db.com/exploits/9214

    Related CVEs

    CVE-2026-84144 (CVSS 7.5) — Internally found bugs present in Thunderbird 154 and Thunderbird ESR 153.1. Some of these bugs showed evidence…
    CVE-2026-84143 (CVSS 9.8) — Internally found bugs present in Thunderbird 154, Thunderbird ESR 153.1 and Thunderbird ESR 140.14. Some of th…
    CVE-2026-84142 (CVSS 9.8) — Internally found bugs present in Thunderbird 154. Some of these bugs showed evidence of memory corruption or a…
    CVE-2026-84141 (CVSS 9.8) — Integer overflow in the Graphics: ImageLib component. This vulnerability was fixed in Firefox 155, Firefox ESR…
    CVE-2026-84140 (CVSS 9.8) — Site isolation issue in the DOM: Navigation component. This vulnerability was fixed in Firefox 155, Firefox ES…
    CVE-2026-84139 (CVSS 6.1) — Clickjacking issue in the DOM: Events component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.…
    CVE-2026-84138 (CVSS 6.5) — Denial-of-service in the PDF Viewer component. This vulnerability was fixed in Firefox 155 and Thunderbird 155…
    CVE-2026-84137 (CVSS 4.3) — Spoofing issue in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 155, Firefox ESR 153…
    CVE-2026-84136 (CVSS 6.1) — Other issue in the DOM: Navigation component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, …
    CVE-2026-84135 (CVSS 9.8) — Other issue in Firefox Focus for Android. This vulnerability was fixed in Firefox 155.…

    References

    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
    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
    http://www.mozilla.org/security/announce/2009/mfsa2009-41.html
    http://www.securityfocus.com/bid/35660
    http://www.vupen.com/english/advisories/2009/1868
    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
    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
    http://www.mozilla.org/security/announce/2009/mfsa2009-41.html
    http://www.securityfocus.com/bid/35660
    http://www.vupen.com/english/advisories/2009/1868
    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

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High