CVE-2024-6874

low-risk
Published 2024-07-24

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.

Do I need to act?

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0.99% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
4
CVSS 4.3/10 Medium
NETWORK / LOW complexity

Affected Products (1)

Affected Vendors

Haxx

References (9)

Mailing List http://www.openwall.com/lists/oss-security/2024/07/24/2
Vendor Advisory https://curl.se/docs/CVE-2024-6874.html
Vendor Advisory https://curl.se/docs/CVE-2024-6874.json
Exploit https://hackerone.com/reports/2604391
Mailing List http://www.openwall.com/lists/oss-security/2024/07/24/2
Vendor Advisory https://curl.se/docs/CVE-2024-6874.html
Vendor Advisory https://curl.se/docs/CVE-2024-6874.json
Exploit https://hackerone.com/reports/2604391
https://security.netapp.com/advisory/ntap-20240822-0004/
26
/ 100
low-risk
Severity 18/34 · Moderate
Exploitability 3/34 · Minimal
Exposure 5/34 · Minimal