CVE-2016-5421

8.1 HIGH 8% exploit odds Fix listed Memory safety

What it is

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.

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of data exposure, data tampering, service disruption.
Exploit odds: 8.0% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2016-08-10 14:59 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 00:49 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 8.0% in the next 30 days (EPSS).
Severity: 8.1 HIGH (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2016-08-10 14:59 UTC
Last modified: 2026-06-17 00:49 UTC
Exploit probability: 8.0% · EPSS, next 30 days
Weakness: CWE-416 · Use after free
Record status: Modified

Affected

Opensuse Leap 42.1
Haxx Libcurl ≤ 7.50.0
Canonical Ubuntu Linux 12.04
Canonical Ubuntu Linux 14.04
Canonical Ubuntu Linux 16.04
Debian Linux 8.0
Fedoraproject Fedora 23
Fedoraproject Fedora 24

Attack profile CVSS 3.1 · 8.1

Attack vector: Network
Complexity: High
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: High

Raw vector

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

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2016-5421.md and follow it. Check whether this project is affected by CVE-2016-5421. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record