CVE-2021-4234: Openvpn Access Server

High severity, CVSS 7.5. EPSS: 0.9% chance of exploitation in the next 30 days.

OpenVPN Access Server 2.10 and prior versions are susceptible to resending multiple packets in a response to a reset packet sent from the client which the client again does not respond to, resulting in a limited amplification attack.

Affected products

• Openvpn Openvpn Access Server: before 2.11.0 (fixed in 2.11.0)

Published 2022-07-06. Last modified 2026-06-17.