# CVE-2023-32634: Auth bypass in SoftEther VPN

> An attacker can bypass authentication in SoftEther VPN via a local man-in-the-middle attack, potentially gaining unauthorized access.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 12 Oct 2023
- **Updated:** 4 Nov 2025
- **Also known as:** GHSA-q5mg-3r24-hvx2

## What is CVE-2023-32634?

CVE-2023-32634 is a high-severity authentication bypass vulnerability in SoftEther VPN, published on 12 Oct 2023. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

An authentication bypass vulnerability exists in the CiRpcServerThread() functionality of SoftEther VPN 5.01.9674 and 4.41-9782-beta. An attacker can perform a local man-in-the-middle attack to trigger this vulnerability.

Weakness: CWE-300 (Channel Accessible by Non-Endpoint)

## Which versions are affected by CVE-2023-32634?

It affects 1 product.


Products: Softether Vpn.

## How do I fix CVE-2023-32634?

No fix has been published for CVE-2023-32634 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-32634 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-32634 exists.

## Other vulnerabilities in SoftEther VPN

- [CVE-2025-25565](https://insights.sbomify.com/CVE-2025-25565/): Memory corruption in n/a (critical 9.8)
- [CVE-2025-25567](https://insights.sbomify.com/CVE-2025-25567/): 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-2023-22308](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-2023-32634 and fix it if it is affected.

What it is: CVE-2023-32634 is a high-severity authentication bypass vulnerability in SoftEther VPN, published on 12 Oct 2023. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-32634 exists.

Affected product: SoftEther VPN. 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-2023-32634/ (Markdown: https://insights.sbomify.com/CVE-2023-32634/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-32634
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-32634
- OSV: https://osv.dev/vulnerability/CVE-2023-32634

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-32634/
Summaries are generated and may contain mistakes; the official description above is the record.