Vulnerability Report

CVE-2016-5421

Title: Haxx Libcurl Memory Corruption

Memory Corruption

Proof Of Concept

No public PoC currently indexed for CVE-2016-5421.

CWE Category CWE-416

Published Date Aug 10, 2016

Modified Date May 06, 2026

Exploit Status Not Found

Score 8.1 CVSS v3.1

Exploit Probability (EPSS)

8.04%

Vulnerability Summary

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.

Impacted Vendors

haxx 1

libcurl 1

Reference Links

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

CVSS v3.1

Source Entity [email protected]

Severity HIGH

8.1

Attack Vector

NETWORK

Complexity

HIGH

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v2.0

Source Entity [email protected]

Severity MEDIUM

6.8

Access Vector

N/A

Authentication

N/A

RAW VECTOR AV:N/AC:M/Au:N/C:P/I:P/A:P

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2016-5421 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

May 06, 2026 MODIFIED

Vulnerability data updated via NVD.

April 12, 2025 MODIFIED

Vulnerability data or affected products updated.

August 10, 2016 PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector NETWORK

Complexity HIGH

Privileges N/A

Interaction NONE

CVSS Vector String


                                    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Stack

No specific products linked.