CVE-2013-4545: Haxx Curl

Medium severity, CVSS 4.3. EPSS: 3.1% chance of exploitation in the next 30 days.

cURL and libcurl 7.18.0 through 7.32.0, when built with OpenSSL, disables the certificate CN and SAN name field verification (CURLOPT_SSL_VERIFYHOST) when the digital signature verification (CURLOPT_SSL_VERIFYPEER) is disabled, which allows man-in-the-middle attackers to spoof SSL servers via an arbitrary valid certificate.

Affected products

• Haxx Curl: version 7.18.0 only; version 7.18.1 only; version 7.18.2 only; version 7.19.0 only; version 7.19.1 only; version 7.19.2 only; …
• Haxx Libcurl: version 7.18.0 only; version 7.18.1 only; version 7.18.2 only; version 7.19.0 only; version 7.19.1 only; version 7.19.2 only; …

Published 2013-11-23. Last modified 2026-06-16.