CVE-2023-25774 Denial of service in SoftEther VPN

High 7.5 Published 12 Oct 2023 Updated 2 Aug 2024

An attacker can cause a denial of service in SoftEther VPN by sending specially crafted network packets to the connection acceptance functionality.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2023-25774?

CVE-2023-25774 is a high-severity denial of service vulnerability in SoftEther VPN, published on 12 Oct 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A denial-of-service vulnerability exists in the vpnserver ConnectionAccept() functionality of SoftEther VPN 5.02. A set of specially crafted network connections can lead to denial of service. An attacker can send a sequence of malicious packets to trigger this vulnerability.

Weakness: CWE-400

Which versions are affected by CVE-2023-25774?

It affects 1 product.

Products include Softether Vpn.

How do I fix CVE-2023-25774?

No fix has been published for CVE-2023-25774 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2023-25774 being exploited?

There is no known exploitation of CVE-2023-25774 in the wild and no public exploit code.

Sources

Also known as GHSA-8jpm-94jj-mfm6.