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

High 7.2 Published 25 Jun 2025 Updated 26 Jun 2025

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

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

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

Which versions are affected by CVE-2025-6443?

It affects 1 product.

Products include 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.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2025-6443 being exploited?

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

All Mikrotik Routeros vulnerabilities

Sources

Also known as GHSA-prqc-5h4f-38x5.