CVE-2019-3943: MikroTik RouterOS

High severity, CVSS 8.1. EPSS: 3.7% chance of exploitation in the next 30 days.

MikroTik RouterOS versions Stable 6.43.12 and below, Long-term 6.42.12 and below, and Testing 6.44beta75 and below are vulnerable to an authenticated, remote directory traversal via the HTTP or Winbox interfaces. An authenticated, remote attack can use this vulnerability to read and write files outside of the sandbox directory (/rw/disk).

Affected products

• MikroTik RouterOS: up to and including 6.42.12; up to and including 6.43.12; version 6.41 only; version 6.42 only; version 6.43 only; version 6.44 only

Published 2019-04-10. Last modified 2026-06-17.