CVE-2024-6874: macidn punycode buffer overread | LiveThreat CVE Feed

Medium severity · published Jul 24, 2024

CVE-2024-6874

macidn punycode buffer overread

4.3

CVSS

0.8%

EPSS

On KEV

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.

CVSS vector

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

Attack vector

Network

Complexity

Low

Privileges

Low

User interaction

None

Confidentiality

Low

Integrity

None

Availability

None

Scope

Unchanged

Exploitation

Is it being used?

Exploit prediction (EPSS)0.8% · higher than 56% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

curl · curl

8.8.0 through 8.8.0 · source: vendor

Libcurl · Haxx

8.8.0 · source: NVD, CISA

In the news

VulnerabilityHigh

Siemens SINEC OS

View CSAF Summary SINEC OS before V3.3 contains third-party components with multiple vulnerabilities. Siemens has released new versions for the affected products and recommends to update to the latest versions. The following versions of Siemens SINEC OS are affected: RUGGEDCOM RST2428P (6GK6242-6PA00) vers:intdot/<3.3 (CVE-2022-48174, CVE-2023-7256, CVE-2023-39810, CVE-2023-42363, CVE-2023-42364, CVE-2023-42365, CVE-2023-42366, CVE-2024-6197, CVE-2024-6874, CVE-2024-7264, CVE-2024-8006, CVE-2024-8096, CVE-2024-9681, CVE-2024-11053, CVE-2024-12718, CVE-2024-41996, CVE-2024-47619, CVE-2024-52533, CVE-2025-0167, CVE-2025-0665, CVE-2025-0725, CVE-2025-1390, CVE-2025-3360, CVE-2025-4138, CVE-2025-4330, CVE-2025-4373, CVE-2025-4435, CVE-2025-4516, CVE-2025-4517, CVE-2025-6141, CVE-2025-9086, CVE-2025-9230, CVE-2025-9231, CVE-2025-9232, CVE-2025-10148, CVE-2025-27587, CVE-2025-32433, CVE-2025-38084, CVE-2025-38085, CVE-2025-38086, CVE-2025-38345, CVE-2025-38350, CVE-2025-38498, CVE-2025-39839, CVE-2025-39841, CVE-2025-39846, CVE-2025-39853, CVE-2025-39860, CVE-2025-39864, CVE-2025-39865, CVE-2025-59375) SCALANCE XCH328 (6GK5328-4TS01-2EC2) vers:intdot/<3.3 (CVE-2022-48174, CVE-2023-7256, CVE-2023-39810, CVE-2023-42363, CVE-2023-42364, CVE-2023-42365, CVE-2023-42366, CVE-2024-6197, CVE-2024-6874, CVE-2024-7264, CVE-2024-8006, CVE-2024-8096, CVE-2024-9681, CVE-2024-11053, CVE-2024-12718, CVE-2024-41996, CVE-2024-47619, CVE-2024-52533, CVE-2025-0167, CVE-2025-0665...

CVE-2022-48174 CVE-2023-7256 CVE-2023-39810

Feb 12, 2026·CISA Advisories

Affected product

curl

All curl CVEs

References

NVD

https://nvd.nist.gov/vuln/detail/CVE-2024-6874

CVE.org

https://www.cve.org/CVERecord?id=CVE-2024-6874

Mailing List

http://www.openwall.com/lists/oss-security/2024/07/24/2