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    CVE-2008-4066

    Mozilla Firefox 2.0.0.14, and other versions before 2.0.0.17, allows remote attackers to bypass cross-site scripting (XSS) protection mechanisms and conduct XSS attacks via HTML-escaped low surrogate characters that are ignored by the HTML parser, as demonstrated by a "jav&#56325ascript" sequence, aka "HTML escaped low surrogates bug."

    Published:Sep 23, 2008
    Last Modified:Apr 23, 2026
    EPS:Sep 24, 2008
    EPSS Score:0.01204
    CVSS Score:4.3

    Affected Products

    Vendor
    Mozilla
    Product
    Firefox
    Vendor
    Redhat
    Product
    Enterprise Linux

    Exploits

    http://blogs.technet.com/bluehat/archive/2008/08/14/targeted-fuzzing.aspxhttp://www.thespanner.co.uk/2008/06/30/javascript-protocol-fuzz-results/http://blogs.technet.com/bluehat/archive/2008/08/14/targeted-fuzzing.aspxhttp://www.thespanner.co.uk/2008/06/30/javascript-protocol-fuzz-results/

    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://blogs.technet.com/bluehat/archive/2008/08/14/targeted-fuzzing.aspx
    http://download.novell.com/Download?buildid=WZXONb-tqBw~
    http://jvn.jp/en/jp/JVN96950482/index.html
    http://jvndb.jvn.jp/ja/contents/2011/JVNDB-2011-000058.html
    http://lists.opensuse.org/opensuse-security-announce/2008-10/msg00005.html
    http://secunia.com/advisories/31984
    http://secunia.com/advisories/31985
    http://secunia.com/advisories/32007
    http://secunia.com/advisories/32010
    http://secunia.com/advisories/32012
    http://secunia.com/advisories/32025
    http://secunia.com/advisories/32042
    http://secunia.com/advisories/32044
    http://secunia.com/advisories/32082
    http://secunia.com/advisories/32092
    http://secunia.com/advisories/32144
    http://secunia.com/advisories/32185
    http://secunia.com/advisories/32196
    http://secunia.com/advisories/32845
    http://secunia.com/advisories/34501
    http://slackware.com/security/viewer.php?l=slackware-security&y=2008&m=slackware-security.379422
    http://slackware.com/security/viewer.php?l=slackware-security&y=2008&m=slackware-security.405232
    http://slackware.com/security/viewer.php?l=slackware-security&y=2008&m=slackware-security.412123
    http://sunsolve.sun.com/search/document.do?assetkey=1-26-256408-1
    http://www.debian.org/security/2008/dsa-1649
    http://www.debian.org/security/2008/dsa-1669
    http://www.mandriva.com/security/advisories?name=MDVSA-2008:205
    http://www.mandriva.com/security/advisories?name=MDVSA-2008:206
    http://www.mozilla.org/security/announce/2008/mfsa2008-43.html
    http://www.redhat.com/support/errata/RHSA-2008-0882.html
    http://www.redhat.com/support/errata/RHSA-2008-0908.html
    http://www.securityfocus.com/bid/31346
    http://www.securitytracker.com/id?1020920
    http://www.thespanner.co.uk/2008/06/30/javascript-protocol-fuzz-results/
    http://www.ubuntu.com/usn/usn-645-1
    http://www.ubuntu.com/usn/usn-645-2
    http://www.ubuntu.com/usn/usn-647-1
    http://www.vupen.com/english/advisories/2008/2661
    http://www.vupen.com/english/advisories/2009/0977
    https://bugzilla.mozilla.org/show_bug.cgi?id=448166
    https://exchange.xforce.ibmcloud.com/vulnerabilities/45358
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A8880
    https://www.redhat.com/archives/fedora-package-announce/2008-September/msg01384.html
    https://www.redhat.com/archives/fedora-package-announce/2008-September/msg01403.html
    http://blogs.technet.com/bluehat/archive/2008/08/14/targeted-fuzzing.aspx
    http://download.novell.com/Download?buildid=WZXONb-tqBw~
    http://jvn.jp/en/jp/JVN96950482/index.html
    http://jvndb.jvn.jp/ja/contents/2011/JVNDB-2011-000058.html
    http://lists.opensuse.org/opensuse-security-announce/2008-10/msg00005.html
    http://secunia.com/advisories/31984
    http://secunia.com/advisories/31985
    http://secunia.com/advisories/32007
    http://secunia.com/advisories/32010
    http://secunia.com/advisories/32012
    http://secunia.com/advisories/32025
    http://secunia.com/advisories/32042
    http://secunia.com/advisories/32044
    http://secunia.com/advisories/32082
    http://secunia.com/advisories/32092
    http://secunia.com/advisories/32144
    http://secunia.com/advisories/32185
    http://secunia.com/advisories/32196
    http://secunia.com/advisories/32845
    http://secunia.com/advisories/34501
    http://slackware.com/security/viewer.php?l=slackware-security&y=2008&m=slackware-security.379422
    http://slackware.com/security/viewer.php?l=slackware-security&y=2008&m=slackware-security.405232
    http://slackware.com/security/viewer.php?l=slackware-security&y=2008&m=slackware-security.412123
    http://sunsolve.sun.com/search/document.do?assetkey=1-26-256408-1
    http://www.debian.org/security/2008/dsa-1649
    http://www.debian.org/security/2008/dsa-1669
    http://www.mandriva.com/security/advisories?name=MDVSA-2008:205
    http://www.mandriva.com/security/advisories?name=MDVSA-2008:206
    http://www.mozilla.org/security/announce/2008/mfsa2008-43.html
    http://www.redhat.com/support/errata/RHSA-2008-0882.html
    http://www.redhat.com/support/errata/RHSA-2008-0908.html
    http://www.securityfocus.com/bid/31346
    http://www.securitytracker.com/id?1020920
    http://www.thespanner.co.uk/2008/06/30/javascript-protocol-fuzz-results/
    http://www.ubuntu.com/usn/usn-645-1
    http://www.ubuntu.com/usn/usn-645-2
    http://www.ubuntu.com/usn/usn-647-1
    http://www.vupen.com/english/advisories/2008/2661
    http://www.vupen.com/english/advisories/2009/0977
    https://bugzilla.mozilla.org/show_bug.cgi?id=448166
    https://exchange.xforce.ibmcloud.com/vulnerabilities/45358
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A8880
    https://www.redhat.com/archives/fedora-package-announce/2008-September/msg01384.html
    https://www.redhat.com/archives/fedora-package-announce/2008-September/msg01403.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