Amplification Attack Vulnerability in OpenVPN Access Server
CVE-2021-4234

7.5HIGH

Key Information:

Vendor
Openvpn
Status
Openvpn Access Server
Vendor
CVE Published:
6 July 2022

Summary

OpenVPN Access Server versions up to 2.10 are vulnerable to an amplification attack. The vulnerability arises when a client sends a reset packet, prompting the server to resend multiple packets in response. If the client does not react to these responses, it can lead to a situation where an attacker exploits this behavior to amplify traffic, potentially overwhelming the network.

Affected Version(s)

OpenVPN Access Server 2.10 and prior version

References

https://openvpn.net/vpn-server-resources/release-notes/#o...
x_refsource_MISC

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.