CVE-2025-25567 — CRITICAL (9.8)

Vulnerability 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,

CVSS Score

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Affected Products

Vendor	Product	Versions
Softether	Vpn	5.02.5187

Related Weaknesses (CWE)

CWE-120

References

FAQ

What is CVE-2025-25567?

CVE-2025-25567 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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 attac...

How severe is CVE-2025-25567?

CVE-2025-25567 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2025-25567?

Check the references section above for vendor advisories and patch information. Affected products include: Softether Vpn.