# CVE-2025-13086: Denial of service in OpenVPN

> An attacker can cause a denial of service for the originating client by opening a session from a different IP address due to improper source IP validation.

- **Severity:** Medium 4.6 (`CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 3 Dec 2025
- **Updated:** 12 Dec 2025
- **Also known as:** ALPINE-CVE-2025-13086, CLEANSTART-2026-MZ17549, DEBIAN-CVE-2025-13086, DSA-6069-1, GHSA-xv5w-q5wq-r3c3, OESA-2025-2742, OESA-2025-2777, OESA-2025-2778, SUSE-SU-2026:0831-1, SUSE-SU-2026:20196-1, UBUNTU-CVE-2025-13086, USN-7898-1, openSUSE-SU-2026:20137-1

## What is CVE-2025-13086?

CVE-2025-13086 is a medium-severity denial of service vulnerability in OpenVPN, published on 3 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Improper validation of source IP addresses in OpenVPN version 2.6.0 through 2.6.15 and 2.7_alpha1 through 2.7_rc1 allows an attacker to open a session from a different IP address which did not initiate the connection resulting in a denial of service for the originating client

Weakness: CWE-940 (Improper Verification of Source of a Communication Channel)

## Which versions are affected by CVE-2025-13086?

It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `openvpn` | SUSE:Linux Enterprise Module for Basesystem 15 SP7 | All versions | 2.6.10-150600.3.20.1 |
| `openvpn-dco` | SUSE:Linux Enterprise Module for Basesystem 15 SP7 | All versions | 2.6.10-150600.3.20.1 |
| `openvpn` | SUSE:Linux Enterprise Server 15 SP6-LTSS | All versions | 2.6.10-150600.3.20.1 |
| `openvpn-dco` | SUSE:Linux Enterprise Server 15 SP6-LTSS | All versions | 2.6.10-150600.3.20.1 |
| `openvpn` | SUSE:Linux Enterprise Server 16.0 | All versions | 2.6.10-160000.3.1 |
| `openvpn` | SUSE:Linux Enterprise Server for SAP Applications 15 SP6 | All versions | 2.6.10-150600.3.20.1 |
| `openvpn-dco` | SUSE:Linux Enterprise Server for SAP Applications 15 SP6 | All versions | 2.6.10-150600.3.20.1 |
| `openvpn` | SUSE:Linux Enterprise Server for SAP applications 16.0 | All versions | 2.6.10-160000.3.1 |
| `openvpn` | openSUSE:Leap 15.6 | All versions | 2.6.10-150600.3.20.1 |
| `openvpn-dco` | openSUSE:Leap 15.6 | All versions | 2.6.10-150600.3.20.1 |
| `openvpn` | openSUSE:Leap 16.0 | All versions | 2.6.10-160000.3.1 |

Products: Openvpn Openvpn.

## How do I fix CVE-2025-13086?

Upgrade to a fixed version.

## Is CVE-2025-13086 being exploited?

There is no known exploitation of CVE-2025-13086 in the wild and no public exploit code.

## Other vulnerabilities in OpenVPN

- [CVE-2025-12106](https://insights.sbomify.com/CVE-2025-12106/): Memory corruption in OpenVPN (critical 9.1)
- [CVE-2024-5594](https://insights.sbomify.com/CVE-2024-5594/): Information disclosure in OpenVPN (critical 9.1)
- [CVE-2018-7544](https://insights.sbomify.com/CVE-2018-7544/): Cross-site request forgery in n/a (critical 9.1)
- [CVE-2006-1629](https://insights.sbomify.com/CVE-2006-1629/): Code injection in n/a (critical 9.0)
- [CVE-2024-4877](https://insights.sbomify.com/CVE-2024-4877/): Privilege escalation in OpenVPN (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-13086 and fix it if it is affected.

What it is: CVE-2025-13086 is a medium-severity denial of service vulnerability in OpenVPN, published on 3 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-13086 in the wild and no public exploit code.

Affected product: OpenVPN. 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-2025-13086/ (Markdown: https://insights.sbomify.com/CVE-2025-13086/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-13086
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-13086
- OSV: https://osv.dev/vulnerability/CVE-2025-13086

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-13086/
Summaries are generated and may contain mistakes; the official description above is the record.