CVE-2023-32634 Auth bypass in SoftEther VPN

High 7.8 Published 12 Oct 2023 Updated 4 Nov 2025

An attacker can bypass authentication in SoftEther VPN via a local man-in-the-middle attack, potentially gaining unauthorized access.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2023-32634?

CVE-2023-32634 is a high-severity authentication bypass vulnerability in SoftEther VPN, published on 12 Oct 2023. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official description

An authentication bypass vulnerability exists in the CiRpcServerThread() functionality of SoftEther VPN 5.01.9674 and 4.41-9782-beta. An attacker can perform a local man-in-the-middle attack to trigger this vulnerability.

Weakness: CWE-300

Which versions are affected by CVE-2023-32634?

It affects 1 product.

Products include Softether Vpn.

How do I fix CVE-2023-32634?

No fix has been published for CVE-2023-32634 yet. Limit exposure of the affected software until one is available.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2023-32634 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-32634 exists.

Sources

Also known as GHSA-q5mg-3r24-hvx2.