CVE-2016-5421

Severity: high (CVSS 8.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 8.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2016-08-10 · updated 2026-06-17
Weakness: CWE-416

Description

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.

Affected products

Canonical Ubuntu Linux: 12.04, 14.04, 16.04
Debian Linux: 8.0
Fedoraproject Fedora: 23, 24
curl: through 7.50.0
openSUSE Leap: 42.1
Opensuse: 13.2

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/

Get alerted when CVE-2016-5421 or the next vulnerability affects your stack