CVE-2019-3924: MikroTik RouterOS

High severity, CVSS 7.5. EPSS: 15.7% chance of exploitation in the next 30 days.

MikroTik RouterOS before 6.43.12 (stable) and 6.42.12 (long-term) is vulnerable to an intermediary vulnerability. The software will execute user defined network requests to both WAN and LAN clients. A remote unauthenticated attacker can use this vulnerability to bypass the router's firewall or for general network scanning activities.

Affected products

• MikroTik RouterOS: before 6.42.12 (fixed in 6.42.12); before 6.43.12 (fixed in 6.43.12)

Published 2019-02-20. Last modified 2026-06-17.