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    CVE-2015-2721

    Mozilla Network Security Services (NSS) before 3.19, as used in Mozilla Firefox before 39.0, Firefox ESR 31.x before 31.8 and 38.x before 38.1, Thunderbird before 38.1, and other products, does not properly determine state transitions for the TLS state machine, which allows man-in-the-middle attackers to defeat cryptographic protection mechanisms by blocking messages, as demonstrated by removing a forward-secrecy property by blocking a ServerKeyExchange message, aka a "SMACK SKIP-TLS" issue.

    Published:Jul 2, 2015
    Last Modified:Apr 12, 2025
    EPS:Jul 6, 2015
    EPSS Score:0.00516
    CVSS Score:4.3

    Affected Products

    Vendor
    Canonical
    Product
    Ubuntu Linux
    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Mozilla
    Product
    Firefox
    Vendor
    Mozilla
    Product
    Firefox Esr
    Vendor
    Mozilla
    Product
    Network Security Services
    Vendor
    Mozilla
    Product
    Thunderbird
    Vendor
    Novell
    Product
    Suse Linux Enterprise Desktop
    Vendor
    Novell
    Product
    Suse Linux Enterprise Server
    Vendor
    Novell
    Product
    Suse Linux Enterprise Software Development Kit
    Vendor
    Oracle
    Product
    Solaris
    Vendor
    Oracle
    Product
    Vm Server
    Vendor
    Redhat
    Product
    Enterprise Linux

    Exploits

    https://bugzilla.mozilla.org/show_bug.cgi?id=1086145https://bugzilla.mozilla.org/show_bug.cgi?id=1086145

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    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://lists.opensuse.org/opensuse-security-announce/2015-07/msg00025.html
    http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00031.html
    http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00033.html
    http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00034.html
    http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00021.html
    http://rhn.redhat.com/errata/RHSA-2015-1185.html
    http://rhn.redhat.com/errata/RHSA-2015-1664.html
    http://www.debian.org/security/2015/dsa-3324
    http://www.debian.org/security/2015/dsa-3336
    http://www.mozilla.org/security/announce/2015/mfsa2015-71.html
    http://www.oracle.com/technetwork/security-advisory/cpuapr2016v3-2985753.html
    http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html
    http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
    http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html
    http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html
    http://www.securityfocus.com/bid/75541
    http://www.securityfocus.com/bid/83398
    http://www.securityfocus.com/bid/91787
    http://www.securitytracker.com/id/1032783
    http://www.securitytracker.com/id/1032784
    http://www.ubuntu.com/usn/USN-2656-1
    http://www.ubuntu.com/usn/USN-2656-2
    http://www.ubuntu.com/usn/USN-2672-1
    http://www.ubuntu.com/usn/USN-2673-1
    https://bugzilla.mozilla.org/show_bug.cgi?id=1086145
    https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.19_release_notes
    https://security.gentoo.org/glsa/201512-10
    https://security.gentoo.org/glsa/201701-46
    https://smacktls.com
    http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00025.html
    http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00031.html
    http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00033.html
    http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00034.html
    http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00021.html
    http://rhn.redhat.com/errata/RHSA-2015-1185.html
    http://rhn.redhat.com/errata/RHSA-2015-1664.html
    http://www.debian.org/security/2015/dsa-3324
    http://www.debian.org/security/2015/dsa-3336
    http://www.mozilla.org/security/announce/2015/mfsa2015-71.html
    http://www.oracle.com/technetwork/security-advisory/cpuapr2016v3-2985753.html
    http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html
    http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
    http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html
    http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html
    http://www.securityfocus.com/bid/75541
    http://www.securityfocus.com/bid/83398
    http://www.securityfocus.com/bid/91787
    http://www.securitytracker.com/id/1032783
    http://www.securitytracker.com/id/1032784
    http://www.ubuntu.com/usn/USN-2656-1
    http://www.ubuntu.com/usn/USN-2656-2
    http://www.ubuntu.com/usn/USN-2672-1
    http://www.ubuntu.com/usn/USN-2673-1
    https://bugzilla.mozilla.org/show_bug.cgi?id=1086145
    https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.19_release_notes
    https://security.gentoo.org/glsa/201512-10
    https://security.gentoo.org/glsa/201701-46
    https://smacktls.com

    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