Mikrotik Routeros Authentication Bypass Vulnerability ⇒ (EXCLUSIVE)

In several instances, attackers have combined authentication bypasses with MikroTik's built-in DNS server. Once they bypassed authentication, they changed the router's DNS settings to redirect users' legitimate web traffic (like banking or social media logins) to malicious phishing clones. The Risks of a Compromised Router

add chain=input protocol=tcp dst-port=8291,80,443 action=drop in-interface=ether1

Note: If you are referring to a different or newer CVE (e.g., from 2024/2025), please check MikroTik’s latest security advisory. As of my last knowledge update, CVE-2023-30799 is the critical authentication bypass affecting WinBox and HTTP. mikrotik routeros authentication bypass vulnerability

If you need help securing your specific environment, let me know: Which your devices are currently running?

Understanding the MikroTik RouterOS Authentication Bypass Vulnerability As of my last knowledge update, CVE-2023-30799 is

: Patched in April 2018, though it remained widely exploited in the wild for years due to slow updates. 2. The Modern Threat: CVE-2023-30799

If you would like to deepen your network security posture, please tell me: Which your devices are currently running? For a more detailed analysis

Also, I want to highlight that I am not a security expert, and this post is not an exhaustive analysis of the vulnerability, but rather a general overview. For a more detailed analysis, I recommend checking the Mikrotik security advisory and other reliable sources.

A robust firewall configuration is your first line of defense. Ensure your firewall blocks all incoming connection attempts to the router's input chain from the WAN (internet) interface, except for those specifically required and secured. Conclusion

MikroTik routers are a staple in ISP infrastructure and SMB networks worldwide due to their flexibility and cost-effectiveness. However, their popularity makes them a prime target for threat actors. One of the most severe vulnerabilities to impact the platform was an authentication bypass issue discovered in 2018.