# CVE-2025-25567: Memory corruption in n/a

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

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 12 Mar 2025
- **Updated:** 19 Jul 2025
- **Also known as:** GHSA-763f-93r5-54qv

## 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 (Buffer Copy without Checking Size of Input)

## Which versions are affected by CVE-2025-25567?

It affects 1 product.


Products: 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.

## Is CVE-2025-25567 being exploited?

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

## Other vulnerabilities in n/a

- [CVE-2025-25565](https://insights.sbomify.com/CVE-2025-25565/): Memory corruption in n/a (critical 9.8)
- [CVE-2025-25568](https://insights.sbomify.com/CVE-2025-25568/): Use after free in n/a (critical 9.8)
- [CVE-2023-27395](https://insights.sbomify.com/CVE-2023-27395/): Memory corruption in SoftEther VPN (critical 9.0)
- [CVE-2023-32634](https://insights.sbomify.com/CVE-2023-32634/): Auth bypass in SoftEther VPN (high 7.8)
- [CVE-2023-22308](https://insights.sbomify.com/CVE-2023-22308/): Integer overflow in SoftEther VPN (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-25567 and fix it if it is affected.

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

Affected product: n/a. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-25567/ (Markdown: https://insights.sbomify.com/CVE-2025-25567/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-25567
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-25567
- OSV: https://osv.dev/vulnerability/CVE-2025-25567

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-25567/
Summaries are generated and may contain mistakes; the official description above is the record.