🛡️ CVE-2024-6874 — libcurl

🟡 CVSS 4.3 — Medium ⚠️ Exploit Public CWE-125 NVD
4.3
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality low, integrity none, availability none.

Weakness class

CVE-2024-6874 is classified as CWE-125: Out-of-bounds Read. The code reads past the limits of a buffer, exposing adjacent memory contents or crashing the process.

Affected software

CVE-2024-6874 is recorded against 1 package.

  • libcurl

Timeline and source

Published on 24 July 2024 and last revised on 17 June 2026. A public exploit is known to exist, which raises the urgency of patching considerably. Record sourced from NVD.

References

www.openwall.com
curl.se
curl.se
hackerone.com
www.openwall.com
curl.se
curl.se
hackerone.com
security.netapp.com

CVE-2024-6874 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity MEDIUM
CVSS Score 4.3
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
CWE CWE-125
Public Exploit ⚠️ Yes
Source NVD
Published 2024-07-24
Updated 2026-08-11
Modified 2026-06-17
Fix URL N/A

Affected Packages

Software From version Fixed in
libcurl — —

Similar Threats

Exploit Protection

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CVE-2024-6874 carries CVSS 4.3 Medium rating and a public exploit already exists. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.

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