CVE-2009-2417: Curl Libcurl

High severity, CVSS 7.5. EPSS: 3.5% chance of exploitation in the next 30 days.

lib/ssluse.c in cURL and libcurl 7.4 through 7.19.5, when OpenSSL is used, does not properly handle a '\0' character in a domain name in the subject's Common Name (CN) field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.

Affected products

• Curl Libcurl: version 7.4 only; version 7.4.1 only; version 7.4.2 only; version 7.5 only; version 7.5.1 only; version 7.5.2 only; …
• Libcurl Libcurl: version 7.12 only; version 7.12.1 only; version 7.12.2 only; version 7.12.3 only; version 7.13 only; version 7.13.1 only; …

Published 2009-08-14. Last modified 2026-06-16.