CVE-2016-5421

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Summary

CVECVE-2016-5421
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2016-08-10 14:59:06 UTC
Updated2026-05-06 22:30:45 UTC
DescriptionUse-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.

Risk And Classification

Primary CVSS: v3.1 8.1 HIGH from [email protected]

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

EPSS: 0.080370000 probability, percentile 0.941760000 (date 2026-07-22)

Problem Types: CWE-416 | n/a

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary8.1HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
2.0[email protected]Primary6.8AV:N/AC:M/Au:N/C:P/I:P/A:P

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
Medium
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
Partial

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Canonical Ubuntu Linux 12.04 All All All
Operating System Canonical Ubuntu Linux 14.04 All All All
Operating System Canonical Ubuntu Linux 16.04 All All All
Operating System Debian Debian Linux 8.0 All All All
Operating System Fedoraproject Fedora 23 All All All
Operating System Fedoraproject Fedora 24 All All All
Application Haxx Libcurl All All All All
Operating System Opensuse Leap 42.1 All All All
Operating System Opensuse Opensuse 13.2 All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified

References

ReferenceSourceLinkTags
CPU Oct 2018 af854a3a-2127-422b-91ae-364da2661108 www.oracle.com Patch, Third Party Advisory
[SECURITY] Fedora 24 Update: curl-7.47.1-6.fc24 - package-announce - Fedora Mailing-Lists af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org
[R7] LCE 4.8.1 Fixes Multiple Vulnerabilities - Security Advisory | Tenable™ af854a3a-2127-422b-91ae-364da2661108 www.tenable.com Third Party Advisory
openSUSE-SU-2016:2379-1: moderate: Security update for curl af854a3a-2127-422b-91ae-364da2661108 lists.opensuse.org Third Party Advisory
Red Hat Customer Portal af854a3a-2127-422b-91ae-364da2661108 access.redhat.com Third Party Advisory
USN-3048-1: curl vulnerabilities | Ubuntu af854a3a-2127-422b-91ae-364da2661108 www.ubuntu.com Third Party Advisory
Android Security Bulletin—December 2016 | Android Open Source Project af854a3a-2127-422b-91ae-364da2661108 source.android.com Third Party Advisory
curl - use of connection struct after free af854a3a-2127-422b-91ae-364da2661108 curl.haxx.se Mitigation, Vendor Advisory
openSUSE-SU-2016:2227-1: moderate: Security update for curl af854a3a-2127-422b-91ae-364da2661108 lists.opensuse.org Third Party Advisory
[SECURITY] Fedora 23 Update: curl-7.43.0-8.fc23 - package-announce - Fedora Mailing-Lists af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org
cURL/libcurl CVE-2016-5421 Local Use After Free Denial of Service Vulnerability af854a3a-2127-422b-91ae-364da2661108 www.securityfocus.com Third Party Advisory, VDB Entry
libcurl Use-After-Free Connection Flaw May Let Local Users Gain Elevated Privileges - SecurityTracker af854a3a-2127-422b-91ae-364da2661108 www.securitytracker.com Third Party Advisory, VDB Entry
cURL: Multiple vulnerabilities (GLSA 201701-47) — Gentoo security af854a3a-2127-422b-91ae-364da2661108 security.gentoo.org Third Party Advisory
Debian -- Security Information -- DSA-3638-1 curl af854a3a-2127-422b-91ae-364da2661108 www.debian.org Third Party Advisory
The Slackware Linux Project: Slackware Security Advisories af854a3a-2127-422b-91ae-364da2661108 www.slackware.com Third Party Advisory
[SECURITY] Fedora 24 Update: curl-7.47.1-6.fc24 - package-announce - Fedora Mailing-Lists MITRE lists.fedoraproject.org
[SECURITY] Fedora 23 Update: curl-7.43.0-8.fc23 - package-announce - Fedora Mailing-Lists MITRE lists.fedoraproject.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 500111 Alpine Linux Security Update for curl
  • 503766 Alpine Linux Security Update for curl
  • 710385 Gentoo Linux cURL Multiple Vulnerabilities (GLSA 201701-47)

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