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    CVE-2009-2408

    Mozilla Network Security Services (NSS) before 3.12.3, Firefox before 3.0.13, Thunderbird before 2.0.0.23, and SeaMonkey before 1.1.18 do not properly handle a '\0' character in a domain name in the subject's Common Name (CN) field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority. NOTE: this was originally reported for Firefox before 3.5.

    Published:Jul 29, 2009
    Last Modified:Apr 23, 2026
    EPS:Jul 30, 2009
    EPSS Score:0.01855
    CVSS Score:5.9

    Affected Products

    Vendor
    Canonical
    Product
    Ubuntu Linux
    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Mozilla
    Product
    Firefox
    Vendor
    Mozilla
    Product
    Network Security Services
    Vendor
    Mozilla
    Product
    Seamonkey
    Vendor
    Mozilla
    Product
    Thunderbird
    Vendor
    Opensuse
    Product
    Opensuse
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Rhel Eus
    Vendor
    Suse
    Product
    Linux Enterprise
    Vendor
    Suse
    Product
    Linux Enterprise Server

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-295 Improper Certificate Validation

    Related CVEs

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    CVE-2026-47337 (CVSS 3.3) — Ubuntu Linux 6.8, 6.17 and 7.0 contain SAUCE patches with a possible NULL pointer dereference in the handling …
    CVE-2026-47336 (CVSS 3.3) — Ubuntu Linux 6.8 contains SAUCE patches with a possible use of an uninitialized variable in AppArmor AF_INET/A…
    CVE-2026-47335 (CVSS 5.5) — Ubuntu Linux 6.8 contains SAUCE patches with a possible NULL pointer dereference in the handling of AppArmor n…
    CVE-2026-47334 (CVSS 5.5) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly sleep while holding a spinlock…
    CVE-2026-47333 (CVSS 7.8) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which can potentially incorrectly compute the si…
    CVE-2026-47332 (CVSS 5.5) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly validate the size of an intern…
    CVE-2026-47331 (CVSS 7.8) — Ubuntu Linux 6.8 contains AppArmor SAUCE patches which fail to acquire a lock when modifying a linked list. An…
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    References

    http://isc.sans.org/diary.html?storyid=7003
    http://lists.opensuse.org/opensuse-security-announce/2009-11/msg00004.html
    http://marc.info/?l=oss-security&m=125198917018936&w=2
    http://osvdb.org/56723
    http://secunia.com/advisories/36088
    http://secunia.com/advisories/36125
    http://secunia.com/advisories/36139
    http://secunia.com/advisories/36157
    http://secunia.com/advisories/36434
    http://secunia.com/advisories/36669
    http://secunia.com/advisories/37098
    http://sunsolve.sun.com/search/document.do?assetkey=1-77-1021030.1-1
    http://www.debian.org/security/2009/dsa-1874
    http://www.mandriva.com/security/advisories?name=MDVSA-2009:197
    http://www.mandriva.com/security/advisories?name=MDVSA-2009:216
    http://www.mandriva.com/security/advisories?name=MDVSA-2009:217
    http://www.mozilla.org/security/announce/2009/mfsa2009-42.html
    http://www.novell.com/linux/security/advisories/2009_48_firefox.html
    http://www.openldap.org/devel/cvsweb.cgi/libraries/libldap/tls_m.c.diff?r1=1.8&r2=1.11&f=h
    http://www.redhat.com/support/errata/RHSA-2009-1207.html
    http://www.redhat.com/support/errata/RHSA-2009-1432.html
    http://www.securitytracker.com/id?1022632
    http://www.ubuntu.com/usn/usn-810-1
    http://www.vupen.com/english/advisories/2009/2085
    http://www.vupen.com/english/advisories/2009/3184
    http://www.wired.com/threatlevel/2009/07/kaminsky/
    https://bugzilla.redhat.com/show_bug.cgi?id=510251
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10751
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A8458
    https://usn.ubuntu.com/810-2/
    http://isc.sans.org/diary.html?storyid=7003
    http://lists.opensuse.org/opensuse-security-announce/2009-11/msg00004.html
    http://marc.info/?l=oss-security&m=125198917018936&w=2
    http://osvdb.org/56723
    http://secunia.com/advisories/36088
    http://secunia.com/advisories/36125
    http://secunia.com/advisories/36139
    http://secunia.com/advisories/36157
    http://secunia.com/advisories/36434
    http://secunia.com/advisories/36669
    http://secunia.com/advisories/37098
    http://sunsolve.sun.com/search/document.do?assetkey=1-77-1021030.1-1
    http://www.debian.org/security/2009/dsa-1874
    http://www.mandriva.com/security/advisories?name=MDVSA-2009:197
    http://www.mandriva.com/security/advisories?name=MDVSA-2009:216
    http://www.mandriva.com/security/advisories?name=MDVSA-2009:217
    http://www.mozilla.org/security/announce/2009/mfsa2009-42.html
    http://www.novell.com/linux/security/advisories/2009_48_firefox.html
    http://www.openldap.org/devel/cvsweb.cgi/libraries/libldap/tls_m.c.diff?r1=1.8&r2=1.11&f=h
    http://www.redhat.com/support/errata/RHSA-2009-1207.html
    http://www.redhat.com/support/errata/RHSA-2009-1432.html
    http://www.securitytracker.com/id?1022632
    http://www.ubuntu.com/usn/usn-810-1
    http://www.vupen.com/english/advisories/2009/2085
    http://www.vupen.com/english/advisories/2009/3184
    http://www.wired.com/threatlevel/2009/07/kaminsky/
    https://bugzilla.redhat.com/show_bug.cgi?id=510251
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10751
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A8458
    https://usn.ubuntu.com/810-2/

    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