The operating system processes the malformed request, fails to trigger the authentication check, and establishes a valid administrative session for the attacker. The Dangerous Consequences of a Router Compromise
For network administrators, the lesson is simple: keep firmware updated, and lock down your management interfaces. If you haven't looked at your edge router configuration since 2018, now is the time to check. mikrotik routeros authentication bypass vulnerability
Always change the default admin password immediately upon setting up the router. The operating system processes the malformed request, fails
Check the user list ( /user print ) for accounts you did not create. Always change the default admin password immediately upon
Always run the latest "Long-term" or "Stable" version. Patching is the single most effective defense against known CVEs.
If you have MikroTik devices running RouterOS 6.x in your environment, assume they are compromised unless proven otherwise. Upgrade immediately.