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    CVE-2014-1555

    Use-after-free vulnerability in the nsDocLoader::OnProgress function in Mozilla Firefox before 31.0, Firefox ESR 24.x before 24.7, and Thunderbird before 24.7 allows remote attackers to execute arbitrary code via vectors that trigger a FireOnStateChange event.

    Published:Jul 22, 2014
    Last Modified:Nov 25, 2025
    EPS:Jul 23, 2014
    EPSS Score:0.01805
    CVSS Score:9.3

    Affected Products

    Vendor
    Mozilla
    Product
    Firefox
    Vendor
    Mozilla
    Product
    Firefox Esr
    Vendor
    Mozilla
    Product
    Thunderbird
    Vendor
    Redhat
    Product
    Enterprise Linux

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-416 Use After Free

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    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://linux.oracle.com/errata/ELSA-2014-0918.html
    http://secunia.com/advisories/59591
    http://secunia.com/advisories/59719
    http://secunia.com/advisories/59760
    http://secunia.com/advisories/60083
    http://secunia.com/advisories/60306
    http://secunia.com/advisories/60486
    http://secunia.com/advisories/60621
    http://secunia.com/advisories/60628
    http://www.debian.org/security/2014/dsa-2986
    http://www.debian.org/security/2014/dsa-2996
    http://www.mozilla.org/security/announce/2014/mfsa2014-61.html
    http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
    http://www.securityfocus.com/bid/68814
    http://www.securitytracker.com/id/1030619
    http://www.securitytracker.com/id/1030620
    https://bugzilla.mozilla.org/show_bug.cgi?id=1023121
    https://security.gentoo.org/glsa/201504-01
    http://linux.oracle.com/errata/ELSA-2014-0918.html
    http://secunia.com/advisories/59591
    http://secunia.com/advisories/59719
    http://secunia.com/advisories/59760
    http://secunia.com/advisories/60083
    http://secunia.com/advisories/60306
    http://secunia.com/advisories/60486
    http://secunia.com/advisories/60621
    http://secunia.com/advisories/60628
    http://www.debian.org/security/2014/dsa-2986
    http://www.debian.org/security/2014/dsa-2996
    http://www.mozilla.org/security/announce/2014/mfsa2014-61.html
    http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
    http://www.securityfocus.com/bid/68814
    http://www.securitytracker.com/id/1030619
    http://www.securitytracker.com/id/1030620
    https://bugzilla.mozilla.org/show_bug.cgi?id=1023121
    https://security.gentoo.org/glsa/201504-01

    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