CVE-2024-2466

TLS certificate check bypass with mbedTLS

libcurl did not check the server certificate of TLS connections done to a host specified as an IP address, when built to use mbedTLS. libcurl would wrongly avoid using the set hostname function when the specified hostname was given as an IP address, therefore completely skipping the certificate check. This affects all uses of TLS protocols (HTTPS, FTPS, IMAPS, POPS3, SMTPS, etc).

Affected

curl

CVSS v3.1 CNA

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

EPSS

1.45% chance of exploitation in the next 30 days, 73rd percentile

Published

2024-03-27

Updated

2026-10-15

Proof-of-concept exploits (1)

• https://www.vicarius.io/vsociety/posts/tls-certificate-check-bypass-curl-with-mbedtls-cve…

Security advisories

• https://curl.se/docs/CVE-2024-2466.html
• https://curl.se/docs/CVE-2024-2466.json
• https://support.apple.com/kb/HT214118
• https://support.apple.com/kb/HT214119
• https://support.apple.com/kb/HT214120
• http://seclists.org/fulldisclosure/2024/Jul/18
• http://seclists.org/fulldisclosure/2024/Jul/19
• http://seclists.org/fulldisclosure/2024/Jul/20
• http://www.openwall.com/lists/oss-security/2024/03/27/4
• https://hackerone.com/reports/2416725
• https://security.netapp.com/advisory/ntap-20240503-0010

References

• CVE Record
• NVD entry