# CVE-2025-6443: Mikrotik RouterOS VXLAN Source IP Improper Access Control Vulnerability

> Remote attackers can bypass VXLAN access restrictions to access internal network resources without authentication.

- **Severity:** High 7.2 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 25 Jun 2025
- **Updated:** 26 Jun 2025
- **Also known as:** GHSA-prqc-5h4f-38x5

## What is CVE-2025-6443?

CVE-2025-6443 is a high-severity missing authorization vulnerability in Mikrotik Routeros, published on 25 Jun 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Mikrotik RouterOS VXLAN Source IP Improper Access Control Vulnerability. This vulnerability allows remote attackers to bypass access restrictions on affected installations of Mikrotik RouterOS. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the handling of remote IP addresses when processing VXLAN traffic. The issue results from the lack of validation of the remote IP address against configured values prior to allowing ingress traffic into the internal network. An attacker can leverage this vulnerability to gain access to internal network resources. Was ZDI-CAN-26415.

Weakness: CWE-284 (Improper Access Control)

## Which versions are affected by CVE-2025-6443?

It affects 1 product.


Products: Mikrotik Routeros.

## How do I fix CVE-2025-6443?

No fix has been published for CVE-2025-6443 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-6443 being exploited?

There is no known exploitation of CVE-2025-6443 in the wild and no public exploit code.

## Other vulnerabilities in Mikrotik Routeros

- [CVE-2018-7445](https://insights.sbomify.com/CVE-2018-7445/): MikroTik RouterOS Stack-Based Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2026-86060](https://insights.sbomify.com/CVE-2026-86060/): MikroTik RouterOS Improper Neutralization of Argument Delimiters in a Command (critical 9.2, exploited in the wild)
- [CVE-2018-14847](https://insights.sbomify.com/CVE-2018-14847/): MikroTik Router OS Directory Traversal (critical 9.1, exploited in the wild)
- [CVE-2026-67277](https://insights.sbomify.com/CVE-2026-67277/): MikroTik RouterOS Missing Authentication for Critical Function (high 8.8, exploited in the wild)
- [CVE-2026-67279](https://insights.sbomify.com/CVE-2026-67279/): Mikrotik RouterOS Improper Enforcement of Behavioral Workflow (medium 6.9, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-6443 and fix it if it is affected.

What it is: CVE-2025-6443 is a high-severity missing authorization vulnerability in Mikrotik Routeros, published on 25 Jun 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-2025-6443 in the wild and no public exploit code.

Affected product: Mikrotik Routeros. 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-2025-6443/ (Markdown: https://insights.sbomify.com/CVE-2025-6443/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-6443
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-6443
- OSV: https://osv.dev/vulnerability/CVE-2025-6443

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-6443/
Summaries are generated and may contain mistakes; the official description above is the record.