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    CVE-2016-5421

    Use-after-free vulnerability in libcurl before 7.50.1 allows attackers to control which connection is used or possibly have unspecified other impact via unknown vectors.

    Published:Aug 3, 2016
    Last Modified:Apr 12, 2025
    EPS:Aug 10, 2016
    EPSS Score:0.01092
    CVSS Score:8.1

    Affected Products

    Vendor
    Canonical
    Product
    Ubuntu Linux
    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Haxx
    Product
    Libcurl
    Vendor
    Opensuse
    Product
    Leap
    Vendor
    Opensuse
    Product
    Opensuse
    Vendor
    Redhat
    Product
    Rhel Software Collections

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-416 Use After Free

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    CVE-2026-13367 (CVSS 7.8) — IBM Informix Dynamic Server 14.10, and 15.0 contain a local privilege escalation vulnerability in the oninit s…
    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…
    CVE-2026-47330 (CVSS 3.3) — Ubuntu Linux 6.8, 7.17 and 7.0 contain AppArmor SAUCE patches which can, under certain circumstances, use an u…

    References

    http://lists.opensuse.org/opensuse-updates/2016-09/msg00011.html
    http://lists.opensuse.org/opensuse-updates/2016-09/msg00094.html
    http://www.debian.org/security/2016/dsa-3638
    http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
    http://www.securityfocus.com/bid/92306
    http://www.securitytracker.com/id/1036536
    http://www.slackware.com/security/viewer.php?l=slackware-security&y=2016&m=slackware-security.563059
    http://www.ubuntu.com/usn/USN-3048-1
    https://access.redhat.com/errata/RHSA-2018:3558
    https://curl.haxx.se/docs/adv_20160803C.html
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GLPXQQKURBQFM4XM6645VRPTOE2AWG33/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/K3GQH4V3XAQ5Z53AMQRDEC3C3UHTW7QR/
    https://security.gentoo.org/glsa/201701-47
    https://source.android.com/security/bulletin/2016-12-01.html
    https://www.tenable.com/security/tns-2016-18
    http://lists.opensuse.org/opensuse-updates/2016-09/msg00011.html
    http://lists.opensuse.org/opensuse-updates/2016-09/msg00094.html
    http://www.debian.org/security/2016/dsa-3638
    http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
    http://www.securityfocus.com/bid/92306
    http://www.securitytracker.com/id/1036536
    http://www.slackware.com/security/viewer.php?l=slackware-security&y=2016&m=slackware-security.563059
    http://www.ubuntu.com/usn/USN-3048-1
    https://access.redhat.com/errata/RHSA-2018:3558
    https://curl.haxx.se/docs/adv_20160803C.html
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GLPXQQKURBQFM4XM6645VRPTOE2AWG33/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/K3GQH4V3XAQ5Z53AMQRDEC3C3UHTW7QR/
    https://security.gentoo.org/glsa/201701-47
    https://source.android.com/security/bulletin/2016-12-01.html
    https://www.tenable.com/security/tns-2016-18

    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