CVE-2024-6874

Name: CVE-2024-6874
Creator: NVD / NIST
Published: 2024-07-24T08:15:03.413+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 0.79%

Last modified Jun 17, 2026

CVE-2024-6874 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. libcurl's URL API function [curl_url_get()](https://curl.se/libcurl/c/curl_url_get.html) offers punycode conversions, to and from IDN. Asking to convert a name that is exactly 256 bytes, libcurl ends up reading outside of a stack based buffer when built to use the *macidn* IDN backend. EPSS estimates a 0.79% chance of exploitation in the next 30 days.

Description

libcurl's URL API function [curl_url_get()](https://curl.se/libcurl/c/curl_url_get.html) offers punycode conversions, to and from IDN. Asking to convert a name that is exactly 256 bytes, libcurl ends up reading outside of a stack based buffer when built to use the *macidn* IDN backend. The conversion function then fills up the provided buffer exactly - but does not null terminate the string. This flaw can lead to stack contents accidently getting returned as part of the converted string.

Metrics

CVSS 3.1

4.3/10

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

EPSS Probability

0.79%

51.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-125

Affected Software

Vendor	Product	Versions
Haxx	Libcurl	8.8.0

References

http://www.openwall.com/lists/oss-security/2024/07/24/2Mailing List, Third Party Advisory
https://curl.se/docs/CVE-2024-6874.htmlVendor Advisory
https://curl.se/docs/CVE-2024-6874.jsonVendor Advisory
https://hackerone.com/reports/2604391Exploit, Issue Tracking, Technical Description
http://www.openwall.com/lists/oss-security/2024/07/24/2Mailing List, Third Party Advisory
https://curl.se/docs/CVE-2024-6874.htmlVendor Advisory
https://curl.se/docs/CVE-2024-6874.jsonVendor Advisory
https://hackerone.com/reports/2604391Exploit, Issue Tracking, Technical Description
https://security.netapp.com/advisory/ntap-20240822-0004/

Timeline

Published: Jul 24, 2024
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2024-6874?

How severe is CVE-2024-6874?

CVE-2024-6874 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 0.79% probability of exploitation in the next 30 days.

How do I fix CVE-2024-6874?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2024-6874?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST