Skip to content
Noroxi
CVE-2016-8625· NVD / CVE Program· CNA redhat

curl before version 7.51.0 uses outdated IDNA 2003 standard to handle International Domain Names and this may lead users to potentially and

curl before version 7.51.0 uses outdated IDNA 2003 standard to handle International Domain Names and this may lead users to potentially and unknowingly issue network transfer requests to the wrong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

HighCVSS 7.5 · v3.0—No exploit Fix available
Published
Aug 1, 2018
Updated
Jun 16, 2026
EPSS
4.3% · 91th percentile
Follow this CVE

Sign in to follow · You’ll be notified if a followed record enters KEV, gets an exploit or is updated.

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 4.3%

CNA vs NVD score

NVD
7.5
CNA · redhat
5.3
2.2 point gap

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

VendorProduct
haxxcurl

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • haxx curlbefore 7.51.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • The Curl Project curl

    • 7.51.0affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Alpine:v3.10curlbefore 7.51.0-r07.51.0-r0
Alpine:v3.11curlbefore 7.51.07.51.0
Debian:12curlbefore 7.51.0-17.51.0-1
Red Hat:rhel_software_collections:3::el6httpd24-curlbefore 0:7.61.1-1.el60:7.61.1-1.el6
Red Hat:rhel_software_collections:3::el6httpd24-curl-debuginfobefore 0:7.61.1-1.el60:7.61.1-1.el6
Red Hat:rhel_software_collections:3::el6httpd24-httpdbefore 0:2.4.34-7.el60:2.4.34-7.el6
Red Hat:rhel_software_collections:3::el6httpd24-httpd-debuginfobefore 0:2.4.34-7.el60:2.4.34-7.el6
Red Hat:rhel_software_collections:3::el6httpd24-httpd-develbefore 0:2.4.34-7.el60:2.4.34-7.el6
Red Hat:rhel_software_collections:3::el6httpd24-httpd-manualbefore 0:2.4.34-7.el60:2.4.34-7.el6
Red Hat:rhel_software_collections:3::el6httpd24-httpd-toolsbefore 0:2.4.34-7.el60:2.4.34-7.el6
Red Hat:rhel_software_collections:3::el6httpd24-libcurlbefore 0:7.61.1-1.el60:7.61.1-1.el6
Red Hat:rhel_software_collections:3::el6httpd24-libcurl-develbefore 0:7.61.1-1.el60:7.61.1-1.el6
Red Hat:rhel_software_collections:3::el6httpd24-libnghttp2before 0:1.7.1-7.el60:1.7.1-7.el6
Red Hat:rhel_software_collections:3::el6httpd24-libnghttp2-develbefore 0:1.7.1-7.el60:1.7.1-7.el6
Red Hat:rhel_software_collections:3::el6httpd24-mod_ldapbefore 0:2.4.34-7.el60:2.4.34-7.el6
Red Hat:rhel_software_collections:3::el6httpd24-mod_proxy_htmlbefore 1:2.4.34-7.el61:2.4.34-7.el6
Red Hat:rhel_software_collections:3::el6httpd24-mod_sessionbefore 0:2.4.34-7.el60:2.4.34-7.el6
Red Hat:rhel_software_collections:3::el6httpd24-mod_sslbefore 1:2.4.34-7.el61:2.4.34-7.el6
Red Hat:rhel_software_collections:3::el6httpd24-nghttp2before 0:1.7.1-7.el60:1.7.1-7.el6
Red Hat:rhel_software_collections:3::el6httpd24-nghttp2-debuginfobefore 0:1.7.1-7.el60:1.7.1-7.el6
Red Hat:rhel_software_collections:3::el7httpd24-curlbefore 0:7.61.1-1.el70:7.61.1-1.el7
Red Hat:rhel_software_collections:3::el7httpd24-curl-debuginfobefore 0:7.61.1-1.el70:7.61.1-1.el7
Red Hat:rhel_software_collections:3::el7httpd24-httpdbefore 0:2.4.34-7.el70:2.4.34-7.el7
Red Hat:rhel_software_collections:3::el7httpd24-httpd-debuginfobefore 0:2.4.34-7.el70:2.4.34-7.el7

+14

Same product

haxx: all records

Other highest-scoring records for the same primary product.

  • CVE-2021-22901curl 7.75.0 through 7.76.1 suffers from a use-after-free vulnerability resulting in already freed memory being used when a TLS 1.3 session t
    50Plan
  • CVE-2023-38039When curl retrieves an HTTP response, it stores the incoming headers so that they can be accessed later via the libcurl headers API.
    47Plan
  • CVE-2024-2398HTTP/2 push headers memory-leak
    45Plan
  • CVE-2019-5482Heap buffer overflow in the TFTP protocol handler in cURL 7.19.4 to 7.65.3.
    44Plan
  • CVE-2017-8817The FTP wildcard function in curl and libcurl before 7.57.0 allows remote attackers to cause a denial of service (out-of-bounds read and app
    42Plan
  • CVE-2017-8816The NTLM authentication feature in curl and libcurl before 7.57.0 on 32-bit platforms allows attackers to cause a denial of service (integer
    42Plan

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
alpine:curl7.51.0-r0 · Alpine:v3.10Package registry (OSV)
debian:curl7.51.0-1 · Debian:12Package registry (OSV)
red hat:httpd24-curl0:7.61.1-1.el6 · Red Hat:rhel_software_collections:3::el6Package registry (OSV)
red hat:httpd24-curl-debuginfo0:7.61.1-1.el6 · Red Hat:rhel_software_collections:3::el6Package registry (OSV)
red hat:httpd24-httpd0:2.4.34-7.el6 · Red Hat:rhel_software_collections:3::el6Package registry (OSV)
red hat:httpd24-httpd-debuginfo0:2.4.34-7.el6 · Red Hat:rhel_software_collections:3::el6Package registry (OSV)
red hat:httpd24-httpd-devel0:2.4.34-7.el6 · Red Hat:rhel_software_collections:3::el6Package registry (OSV)
red hat:httpd24-httpd-manual0:2.4.34-7.el6 · Red Hat:rhel_software_collections:3::el6Package registry (OSV)
red hat:httpd24-httpd-tools0:2.4.34-7.el6 · Red Hat:rhel_software_collections:3::el6Package registry (OSV)
red hat:httpd24-libcurl0:7.61.1-1.el6 · Red Hat:rhel_software_collections:3::el6Package registry (OSV)
red hat:httpd24-libcurl-devel0:7.61.1-1.el6 · Red Hat:rhel_software_collections:3::el6Package registry (OSV)
red hat:httpd24-libnghttp20:1.7.1-7.el6 · Red Hat:rhel_software_collections:3::el6Package registry (OSV)
red hat:httpd24-libnghttp2-devel0:1.7.1-7.el6 · Red Hat:rhel_software_collections:3::el6Package registry (OSV)
red hat:httpd24-mod_ldap0:2.4.34-7.el6 · Red Hat:rhel_software_collections:3::el6Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
high · data or configuration can be modified
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
High
Availability impact
None

CVSS vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

nvd-primary

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

All records