Mikrotik RouterOS VXLAN Source IP Improper Access Control Vulnerability

June 25th, 2025
ZDI-25-424 ZDI-CAN-26415

CVE ID

CVE-2025-6443

CVSS Score

7.2 AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Affected Vendors

Mikrotik

Affected Products

RouterOS

Vulnerability Details

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.

Additional Details

Fixed in RouterOS v7.20


Disclosure Timeline

  • 2025-02-13 - Vulnerability reported to vendor
  • 2025-06-25 - Coordinated public release of advisory
  • 2025-06-25 - Advisory Updated

Credit

Trend Micro (SHU-HAO, TUNG) (123ojp)

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