CVE-2023-23581 Denial of service in SoftEther VPN

High 7.5 Published 12 Oct 2023 Updated 2 Aug 2024

A specially crafted network packet can cause a denial of service in SoftEther VPN, affecting service availability.

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-2023-23581?

CVE-2023-23581 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 EnSafeHttpHeaderValueStr functionality of SoftEther VPN 5.01.9674 and 5.02. A specially crafted network packet can lead to denial of service.

Weakness: CWE-125

Which versions are affected by CVE-2023-23581?

It affects 1 product.

Products include Softether Vpn.

How do I fix CVE-2023-23581?

No fix has been published for CVE-2023-23581 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-2023-23581 being exploited?

There is no known exploitation of CVE-2023-23581 in the wild and no public exploit code.

Sources

Also known as GHSA-9h4p-65h5-f3vx.