What is CVE-2016-8625?

CVE-2016-8625 is a medium-severity vulnerability in Haxx Curl, classified under Improper Input Validation. CVSS score: 5.3/10. Published 2018-08-01.

How severe is CVE-2016-8625?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Is CVE-2016-8625 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Improper input validation in Haxx Curl

CVE-2016-8625

curl before version 7.51.0 uses outdated IDNA 2003 standard to handle International Domain Names and this may lead users to potentially and unknowingly issue network transfer requests to the wrong host.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2018-08-01 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.043 (90.8th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 91st percentile — 90.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.043 · newest: 0.043 · change: 0.000

Affected products

Haxx Curl
The Curl Project — versions 7.51.0

Weakness classification (CWE)

CWE-20 — Improper Input Validation

Public proof-of-concept exploits

fokypoky/places-list

References

www.securityfocus.com/bid/94107 (VDB Entry, Third Party Advisory, vdb-entry)
curl.haxx.se/CVE-2016-8625.patch (Patch, Vendor Advisory)
access.redhat.com/errata/RHSA-2018:3558 (vendor-advisory, Third Party Advisory)
www.tenable.com/security/tns-2016-21 (Third Party Advisory)
curl.haxx.se/docs/adv_20161102K.html (Patch, Vendor Advisory)
www.securitytracker.com/id/1037192 (VDB Entry, Third Party Advisory, vdb-entry)
bugzilla.redhat.com/show_bug.cgi (Patch, Third Party Advisory, Issue Tracking)
access.redhat.com/errata/RHSA-2018:2486 (vendor-advisory, Third Party Advisory)
security.gentoo.org/glsa/201701-47 (vendor-advisory, Third Party Advisory)
lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a4508… (mailing-list)

Frequently asked questions

What is CVE-2016-8625?: CVE-2016-8625 is a medium-severity vulnerability in Haxx Curl, classified under Improper Input Validation. CVSS score: 5.3/10. Published 2018-08-01.
How severe is CVE-2016-8625?: Medium severity. CVSS v3 base score is 5.3 out of 10.
Is CVE-2016-8625 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.