What is CVE-2025-25567?

CVE-2025-25567 is a critical-severity vulnerability in Softether Vpn, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2025-03-12.

How severe is CVE-2025-25567?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Softether Vpn

CVE-2025-25567

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,

Vulnerability class: Buffer Overflow

EPSS: 0.006 (42.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Softether Vpn — versions 5.02.5187
N/a — versions n/a

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

cve@mitre.org (Exploit)
cve@mitre.org

Frequently asked questions

What is CVE-2025-25567?: CVE-2025-25567 is a critical-severity vulnerability in Softether Vpn, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2025-03-12.
How severe is CVE-2025-25567?: Critical severity. CVSS v3 base score is 9.8 out of 10.