CVE-2017-7521: Openvpn

Medium severity, CVSS 5.9. EPSS: 3.9% chance of exploitation in the next 30 days.

OpenVPN versions before 2.4.3 and before 2.3.17 are vulnerable to remote denial-of-service due to memory exhaustion caused by memory leaks and double-free issue in extract_x509_extension().

Affected products

• Openvpn Openvpn: up to and including 2.3.16; version 2.4.0 only; version 2.4.1 only; version 2.4.2 only

Published 2017-06-27. Last modified 2026-06-17.