However, RouterOS versions up to 7.20 fail to enforce this crucial separation. The system relies on a shared and trusted equally by all services. Therefore, if a CA exists in this store, every service—OpenVPN, CAPsMAN, Dot1X—trusts it unconditionally, regardless of context. This "confusion of scope" allows a certificate intended for one purpose (e.g., verifying a website's HTTPS certificate from Let's Encrypt) to be used to impersonate a legitimate CAPsMAN manager or an OpenVPN client.
The vulnerability affects all versions:
An authentication bypass occurs when a flaw in any of these interfaces allows an attacker to skip the password verification phase entirely, instantly elevating their privileges to admin . Historical Case Studies: Anatomy of Flaws mikrotik routeros authentication bypass vulnerability
: Attackers targeted the user.dat file, which contains the encrypted credentials of the system administrators.
The vulnerability can be exploited by a remote authenticated user with "admin" privileges on the vulnerable device. Once escalated to super-admin, the attacker gains full remote control of the router, enabling them to: However, RouterOS versions up to 7
Attackers craft specific, malformed packets sent to the Winbox or Webfig ports. If the software fails to properly sanitize the input, the attacker can read arbitrary files—such as the user database file ( list )—allowing them to extract encrypted or plaintext administrative credentials.
💡 Most "bypass" attacks on MikroTik rely on management ports (8291 for Winbox, 80/443 for WebFig) being exposed to the open internet. Closing these or restricting them via firewall is your best defense. This "confusion of scope" allows a certificate intended
A web-based management interface accessible via HTTP (port 80) or HTTPS (port 443).