CVE-2025-25567 Memory corruption in n/a

Critical 9.8 Published 12 Mar 2025 Updated 19 Jul 2025

A buffer overflow in SoftEther VPN allows local users to potentially execute arbitrary code via the UI, though the vendor disputes the severity.

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-2025-25567?

CVE-2025-25567 is a critical memory corruption vulnerability in n/a, published on 12 Mar 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

SoftEther VPN 5.02.5187 is vulnerable to Buffer Overflow in Internat.c via the UniToStrForSingleChars function. NOTE: the Supplier disputes this because the behavior only enables a local user to attack himself through the UI,

Weakness: CWE-120

Which versions are affected by CVE-2025-25567?

It affects 1 product.

Products include Softether Vpn.

How do I fix CVE-2025-25567?

No fix has been published for CVE-2025-25567 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2025-25567 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-25567 exists.

Sources

Also known as GHSA-763f-93r5-54qv.