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    CVE-2009-1836

    Mozilla Firefox before 3.0.11, Thunderbird before 2.0.0.22, and SeaMonkey before 1.1.17 use the HTTP Host header to determine the context of a document provided in a non-200 CONNECT response from a proxy server, which allows man-in-the-middle attackers to execute arbitrary web script by modifying this CONNECT response, aka an "SSL tampering" attack.

    Published:Jun 11, 2009
    Last Modified:Apr 23, 2026
    EPS:Jun 12, 2009
    EPSS Score:0.02032
    CVSS Score:6.8

    Affected Products

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

    Exploits

    https://bugzilla.mozilla.org/show_bug.cgi?id=479880https://bugzilla.redhat.com/show_bug.cgi?id=503578https://bugzilla.mozilla.org/show_bug.cgi?id=479880https://bugzilla.redhat.com/show_bug.cgi?id=503578

    Common Weakness Enumeration

    CWE-287 Improper Authentication

    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://osvdb.org/55160
    http://research.microsoft.com/apps/pubs/default.aspx?id=79323
    http://research.microsoft.com/pubs/79323/pbp-final-with-update.pdf
    http://secunia.com/advisories/35331
    http://secunia.com/advisories/35415
    http://secunia.com/advisories/35431
    http://secunia.com/advisories/35439
    http://secunia.com/advisories/35440
    http://secunia.com/advisories/35468
    http://secunia.com/advisories/35536
    http://secunia.com/advisories/35561
    http://secunia.com/advisories/35602
    http://secunia.com/advisories/35882
    http://slackware.com/security/viewer.php?l=slackware-security&y=2009&m=slackware-security.372468
    http://slackware.com/security/viewer.php?l=slackware-security&y=2009&m=slackware-security.425408
    http://sunsolve.sun.com/search/document.do?assetkey=1-66-264308-1
    http://www.debian.org/security/2009/dsa-1820
    http://www.debian.org/security/2009/dsa-1830
    http://www.mandriva.com/security/advisories?name=MDVSA-2009:141
    http://www.mozilla.org/security/announce/2009/mfsa2009-27.html
    http://www.redhat.com/support/errata/RHSA-2009-1126.html
    http://www.securityfocus.com/bid/35326
    http://www.securityfocus.com/bid/35380
    http://www.securitytracker.com/id?1022396
    http://www.slackware.com/security/viewer.php?l=slackware-security&y=2009&m=slackware-security.454275
    http://www.ubuntu.com/usn/usn-782-1
    http://www.vupen.com/english/advisories/2009/1572
    https://bugzilla.mozilla.org/show_bug.cgi?id=479880
    https://bugzilla.redhat.com/show_bug.cgi?id=503578
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11764
    https://rhn.redhat.com/errata/RHSA-2009-1095.html
    https://www.redhat.com/archives/fedora-package-announce/2009-July/msg00444.html
    https://www.redhat.com/archives/fedora-package-announce/2009-July/msg00504.html
    https://www.redhat.com/archives/fedora-package-announce/2009-June/msg00574.html
    https://www.redhat.com/archives/fedora-package-announce/2009-June/msg00657.html
    http://osvdb.org/55160
    http://research.microsoft.com/apps/pubs/default.aspx?id=79323
    http://research.microsoft.com/pubs/79323/pbp-final-with-update.pdf
    http://secunia.com/advisories/35331
    http://secunia.com/advisories/35415
    http://secunia.com/advisories/35431
    http://secunia.com/advisories/35439
    http://secunia.com/advisories/35440
    http://secunia.com/advisories/35468
    http://secunia.com/advisories/35536
    http://secunia.com/advisories/35561
    http://secunia.com/advisories/35602
    http://secunia.com/advisories/35882
    http://slackware.com/security/viewer.php?l=slackware-security&y=2009&m=slackware-security.372468
    http://slackware.com/security/viewer.php?l=slackware-security&y=2009&m=slackware-security.425408
    http://sunsolve.sun.com/search/document.do?assetkey=1-66-264308-1
    http://www.debian.org/security/2009/dsa-1820
    http://www.debian.org/security/2009/dsa-1830
    http://www.mandriva.com/security/advisories?name=MDVSA-2009:141
    http://www.mozilla.org/security/announce/2009/mfsa2009-27.html
    http://www.redhat.com/support/errata/RHSA-2009-1126.html
    http://www.securityfocus.com/bid/35326
    http://www.securityfocus.com/bid/35380
    http://www.securitytracker.com/id?1022396
    http://www.slackware.com/security/viewer.php?l=slackware-security&y=2009&m=slackware-security.454275
    http://www.ubuntu.com/usn/usn-782-1
    http://www.vupen.com/english/advisories/2009/1572
    https://bugzilla.mozilla.org/show_bug.cgi?id=479880
    https://bugzilla.redhat.com/show_bug.cgi?id=503578
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11764
    https://rhn.redhat.com/errata/RHSA-2009-1095.html
    https://www.redhat.com/archives/fedora-package-announce/2009-July/msg00444.html
    https://www.redhat.com/archives/fedora-package-announce/2009-July/msg00504.html
    https://www.redhat.com/archives/fedora-package-announce/2009-June/msg00574.html
    https://www.redhat.com/archives/fedora-package-announce/2009-June/msg00657.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