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    CVE-2009-2409

    The Network Security Services (NSS) library before 3.12.3, as used in Firefox; GnuTLS before 2.6.4 and 2.7.4; OpenSSL 0.9.8 through 0.9.8k; and other products support MD2 with X.509 certificates, which might allow remote attackers to spoof certificates by using MD2 design flaws to generate a hash collision in less than brute-force time. NOTE: the scope of this issue is currently limited because the amount of computation required is still large.

    Published:Jul 29, 2009
    Last Modified:Apr 23, 2026
    EPS:Jul 30, 2009
    EPSS Score:0.02215
    CVSS Score:5.1

    Affected Products

    Vendor
    Gnu
    Product
    Gnutls
    Vendor
    Mozilla
    Product
    Network Security Services
    Vendor
    Openssl
    Product
    Openssl
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Network Satellite
    Vendor
    Redhat
    Product
    Rhel Eus
    Vendor
    Redhat
    Product
    Rhel Extras

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-295 Improper Certificate Validation

    Related CVEs

    CVE-2026-42014 (CVSS 6.6) — A flaw was found in GnuTLS. The `gnutls_pkcs11_token_set_pin` function, used for changing the Security Officer…
    CVE-2026-5419 (CVSS 3.7) — A flaw was found in gnutls. The PKCS#7 padding check, performed during decryption, was not constant-time. This…
    CVE-2026-42013 (CVSS 8.2) — A flaw was found in gnutls. When validating certificates, an oversized Subject Alternative Name (SAN) could ca…
    CVE-2026-42012 (CVSS 7.1) — A flaw was found in gnutls. A remote attacker could exploit this vulnerability by presenting a specially craft…
    CVE-2026-5260 (CVSS 8.2) — A flaw was found in libgnutls. A remote attacker, by sending an extremely short premaster secret during an RSA…
    CVE-2026-33846 (CVSS 7.5) — A heap buffer overflow vulnerability exists in the DTLS handshake fragment reassembly logic of GnuTLS. The iss…
    CVE-2026-3832 (CVSS 3.7) — A flaw was found in gnutls. A remote attacker could exploit this vulnerability by presenting a specially craft…
    CVE-2026-33845 (CVSS 7.5) — A flaw in GnuTLS DTLS handshake parsing allows malformed fragments with zero length and non-zero offset, leadi…
    CVE-2026-3833 (CVSS 6.5) — A flaw was found in gnutls. This vulnerability occurs because gnutls performs case-sensitive comparisons of `n…
    CVE-2026-42009 (CVSS 7.5) — A flaw was found in gnutls. A remote attacker could exploit an issue in the Datagram Transport Layer Security …

    References

    http://java.sun.com/j2se/1.5.0/ReleaseNotes.html
    http://java.sun.com/javase/6/webnotes/6u17.html
    http://lists.apple.com/archives/security-announce/2009/Nov/msg00000.html
    http://secunia.com/advisories/36139
    http://secunia.com/advisories/36157
    http://secunia.com/advisories/36434
    http://secunia.com/advisories/36669
    http://secunia.com/advisories/36739
    http://secunia.com/advisories/37386
    http://secunia.com/advisories/42467
    http://security.gentoo.org/glsa/glsa-200911-02.xml
    http://security.gentoo.org/glsa/glsa-200912-01.xml
    http://support.apple.com/kb/HT3937
    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-2009:258
    http://www.mandriva.com/security/advisories?name=MDVSA-2010:084
    http://www.redhat.com/support/errata/RHSA-2009-1207.html
    http://www.redhat.com/support/errata/RHSA-2009-1432.html
    http://www.securityfocus.com/archive/1/515055/100/0/threaded
    http://www.securitytracker.com/id?1022631
    http://www.ubuntu.com/usn/usn-810-1
    http://www.vmware.com/security/advisories/VMSA-2010-0019.html
    http://www.vupen.com/english/advisories/2009/2085
    http://www.vupen.com/english/advisories/2009/3184
    http://www.vupen.com/english/advisories/2010/3126
    https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2009-2409
    https://lists.balabit.com/pipermail/syslog-ng-announce/2011-January/000101.html
    https://lists.balabit.com/pipermail/syslog-ng-announce/2011-January/000102.html
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10763
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6631
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7155
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A8594
    https://rhn.redhat.com/errata/RHSA-2010-0095.html
    https://usn.ubuntu.com/810-2/
    https://www.debian.org/security/2009/dsa-1888
    http://java.sun.com/j2se/1.5.0/ReleaseNotes.html
    http://java.sun.com/javase/6/webnotes/6u17.html
    http://lists.apple.com/archives/security-announce/2009/Nov/msg00000.html
    http://secunia.com/advisories/36139
    http://secunia.com/advisories/36157
    http://secunia.com/advisories/36434
    http://secunia.com/advisories/36669
    http://secunia.com/advisories/36739
    http://secunia.com/advisories/37386
    http://secunia.com/advisories/42467
    http://security.gentoo.org/glsa/glsa-200911-02.xml
    http://security.gentoo.org/glsa/glsa-200912-01.xml
    http://support.apple.com/kb/HT3937
    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-2009:258
    http://www.mandriva.com/security/advisories?name=MDVSA-2010:084
    http://www.redhat.com/support/errata/RHSA-2009-1207.html
    http://www.redhat.com/support/errata/RHSA-2009-1432.html
    http://www.securityfocus.com/archive/1/515055/100/0/threaded
    http://www.securitytracker.com/id?1022631
    http://www.ubuntu.com/usn/usn-810-1
    http://www.vmware.com/security/advisories/VMSA-2010-0019.html
    http://www.vupen.com/english/advisories/2009/2085
    http://www.vupen.com/english/advisories/2009/3184
    http://www.vupen.com/english/advisories/2010/3126
    https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2009-2409
    https://lists.balabit.com/pipermail/syslog-ng-announce/2011-January/000101.html
    https://lists.balabit.com/pipermail/syslog-ng-announce/2011-January/000102.html
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10763
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6631
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7155
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A8594
    https://rhn.redhat.com/errata/RHSA-2010-0095.html
    https://usn.ubuntu.com/810-2/
    https://www.debian.org/security/2009/dsa-1888

    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