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    CVE-2009-5138

    GnuTLS before 2.7.6, when the GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT flag is not enabled, treats version 1 X.509 certificates as intermediate CAs, which allows remote attackers to bypass intended restrictions by leveraging a X.509 V1 certificate from a trusted CA to issue new certificates, a different vulnerability than CVE-2014-1959.

    Published:Jan 9, 2009
    Last Modified:Apr 12, 2025
    EPS:Mar 6, 2014
    EPSS Score:0.01369
    CVSS Score:5.8

    Affected Products

    Vendor
    Gnu
    Product
    Gnutls
    Vendor
    Redhat
    Product
    Enterprise Linux

    Exploits

    https://gitorious.org/gnutls/gnutls/commit/c8dcbedd1fdc312f5b1a70fcfbc1afe235d800cdhttps://gitorious.org/gnutls/gnutls/commit/c8dcbedd1fdc312f5b1a70fcfbc1afe235d800cd

    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://article.gmane.org/gmane.comp.security.oss.general/12223
    http://lists.opensuse.org/opensuse-security-announce/2014-03/msg00000.html
    http://lists.opensuse.org/opensuse-security-announce/2014-03/msg00001.html
    http://lists.opensuse.org/opensuse-security-announce/2014-03/msg00003.html
    http://lists.opensuse.org/opensuse-security-announce/2014-03/msg00020.html
    http://rhn.redhat.com/errata/RHSA-2014-0247.html
    http://secunia.com/advisories/57254
    http://secunia.com/advisories/57260
    http://secunia.com/advisories/57274
    http://secunia.com/advisories/57321
    http://thread.gmane.org/gmane.comp.encryption.gpg.gnutls.devel/3351/focus=3361
    http://thread.gmane.org/gmane.comp.security.oss.general/12127
    https://bugzilla.redhat.com/show_bug.cgi?id=1069301
    https://gitorious.org/gnutls/gnutls/commit/c8dcbedd1fdc312f5b1a70fcfbc1afe235d800cd
    http://article.gmane.org/gmane.comp.security.oss.general/12223
    http://lists.opensuse.org/opensuse-security-announce/2014-03/msg00000.html
    http://lists.opensuse.org/opensuse-security-announce/2014-03/msg00001.html
    http://lists.opensuse.org/opensuse-security-announce/2014-03/msg00003.html
    http://lists.opensuse.org/opensuse-security-announce/2014-03/msg00020.html
    http://rhn.redhat.com/errata/RHSA-2014-0247.html
    http://secunia.com/advisories/57254
    http://secunia.com/advisories/57260
    http://secunia.com/advisories/57274
    http://secunia.com/advisories/57321
    http://thread.gmane.org/gmane.comp.encryption.gpg.gnutls.devel/3351/focus=3361
    http://thread.gmane.org/gmane.comp.security.oss.general/12127
    https://bugzilla.redhat.com/show_bug.cgi?id=1069301
    https://gitorious.org/gnutls/gnutls/commit/c8dcbedd1fdc312f5b1a70fcfbc1afe235d800cd

    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