CVE-2025-25567

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,

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CVSS v3.1 Score

9.8

CRITICAL

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

Weakness Type (CWE)

CWE-120 CWE-120

Affected Products

Vendor	Product	Versions
softether	vpn	All

References

Exploits

https://lzydry.github.io/CVE-2025-25567/ https://lzydry.github.io/CVE-2025-25567/

Other References

https://filecenter.softether-upload.com/d/250715_001_79538/CVE-2025-25567.pdf

Frequently Asked Questions

What is 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, It has a CVSS v3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2025-25567? +

CVE-2025-25567 has a CVSS v3.1 score of 9.8 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately.

What products are affected by CVE-2025-25567? +

CVE-2025-25567 affects products from softether, specifically: vpn. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-25567? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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