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    CVE-2006-5633

    Firefox 1.5.0.7 and 2.0, and Seamonkey 1.1b, allows remote attackers to cause a denial of service (crash) by creating a range object using createRange, calling selectNode on a DocType node (DOCUMENT_TYPE_NODE), then calling createContextualFragment on the range, which triggers a null dereference. NOTE: the original Bugtraq post mentioned that code execution was possible, but followup analysis has shown that it is only a null dereference.

    Published:Oct 31, 2006
    Last Modified:Apr 23, 2026
    EPS:Oct 31, 2006
    EPSS Score:0.1608
    CVSS Score:5

    Affected Products

    Vendor
    Mozilla
    Product
    Firefox
    Vendor
    Mozilla
    Product
    Seamonkey

    Exploits

    http://lists.grok.org.uk/pipermail/full-disclosure/2006-October/050416.htmlhttp://www.gotfault.net/research/advisory/gadv-firefox.txthttp://www.securityfocus.com/archive/1/450168/100/0/threadedhttps://bugzilla.mozilla.org/show_bug.cgi?id=358797https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=213237http://lists.grok.org.uk/pipermail/full-disclosure/2006-October/050416.htmlhttp://www.gotfault.net/research/advisory/gadv-firefox.txthttp://www.securityfocus.com/archive/1/450168/100/0/threadedhttps://bugzilla.mozilla.org/show_bug.cgi?id=358797https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=213237https://www.exploit-db.com/exploits/2695

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    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://lists.grok.org.uk/pipermail/full-disclosure/2006-October/050416.html
    http://www.gotfault.net/research/advisory/gadv-firefox.txt
    http://www.securityfocus.com/archive/1/450155/100/0/threaded
    http://www.securityfocus.com/archive/1/450167/100/0/threaded
    http://www.securityfocus.com/archive/1/450168/100/0/threaded
    http://www.securityfocus.com/archive/1/450682/100/200/threaded
    http://www.securityfocus.com/archive/1/452803/100/0/threaded
    http://www.securityfocus.com/bid/20799
    https://bugzilla.mozilla.org/show_bug.cgi?id=358797
    https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=213237
    https://exchange.xforce.ibmcloud.com/vulnerabilities/29916
    http://lists.grok.org.uk/pipermail/full-disclosure/2006-October/050416.html
    http://www.gotfault.net/research/advisory/gadv-firefox.txt
    http://www.securityfocus.com/archive/1/450155/100/0/threaded
    http://www.securityfocus.com/archive/1/450167/100/0/threaded
    http://www.securityfocus.com/archive/1/450168/100/0/threaded
    http://www.securityfocus.com/archive/1/450682/100/200/threaded
    http://www.securityfocus.com/archive/1/452803/100/0/threaded
    http://www.securityfocus.com/bid/20799
    https://bugzilla.mozilla.org/show_bug.cgi?id=358797
    https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=213237
    https://exchange.xforce.ibmcloud.com/vulnerabilities/29916

    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