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CVE-2024-6874

LOW
Published 2024-07-24T07:36:26.887Z
Actions:

Expert Analysis

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CVSS Score

V3.1
3.1
/10
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
Base Score Metrics
Exploitability: N/A Impact: N/A

EPSS Score

v2025.03.14
0.002
probability
of exploitation in the wild

There is a 0.2% chance that this vulnerability will be exploited in the wild within the next 30 days.

Updated: 2025-06-25
Exploit Probability
Percentile: 0.467
Higher than 46.7% of all CVEs

Attack Vector Metrics

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED

Impact Metrics

Confidentiality
LOW
Integrity
NONE
Availability
NONE

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.

Available Exploits

No exploits available for this CVE.

Related News

No news articles found for this CVE.

Affected Products

curl

curl

Affected Versions:

8.8.0
curl

libcurl

Affected Versions:

8.8.0

GitHub Security Advisories

Community-driven vulnerability intelligence from GitHub

⚠ Unreviewed LOW

GHSA-chhh-4xrf-42pg

Advisory Details

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.

CVSS Scoring

CVSS Score

2.5

CVSS Vector

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

References

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2024-6874
WEB https://hackerone.com/reports/2604391
WEB https://curl.se/docs/CVE-2024-6874.html
WEB https://curl.se/docs/CVE-2024-6874.json
WEB http://www.openwall.com/lists/oss-security/2024/07/24/2

Advisory provided by GitHub Security Advisory Database. Published: July 24, 2024, Modified: August 1, 2024

References

https://curl.se/docs/CVE-2024-6874.json
https://curl.se/docs/CVE-2024-6874.html
https://hackerone.com/reports/2604391
http://www.openwall.com/lists/oss-security/2024/07/24/2

HackerOne Reports

curl: stack-buffer overread during punycode conversions Low
z2_
Internet Bug Bounty
Buffer Over-read
View Report
Published: 2024-07-24T07:36:26.887Z
Last Modified: 2025-02-13T17:58:00.151Z
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