CVE-2025-25566: vpn — Exploit

Description

Memory Leak vulnerability in SoftEtherVPN 5.02.5187 allows an attacker to cause a denial of service via the UnixMemoryAlloc function. NOTE: the Supplier disputes this because the behavior is limited to a single allocation of a few hundred bytes with a command-line tool.

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CVSS v3.1 Score

5.6

MEDIUM

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

Weakness Type (CWE)

CWE-401 CWE-401

Affected Products

Vendor	Product	Versions
softether	vpn	All

References

Exploits

https://lzydry.github.io/CVE-2025-25566/

Other References

https://filecenter.softether-upload.com/d/250715_001_79538/CVE-2025-25566.pdf

Frequently Asked Questions

What is CVE-2025-25566? +

Memory Leak vulnerability in SoftEtherVPN 5.02.5187 allows an attacker to cause a denial of service via the UnixMemoryAlloc function. NOTE: the Supplier disputes this because the behavior is limited to a single allocation of a few hundred bytes with a command-line tool. It has a CVSS v3.1 base score of 5.6 (MEDIUM).

How severe is CVE-2025-25566? +

CVE-2025-25566 has a CVSS v3.1 score of 5.6 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-25566? +

CVE-2025-25566 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-2025-25566? +

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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