CVE-2017-20149: MikroTik RouterOS

Critical severity, CVSS 9.8. EPSS: 2% chance of exploitation in the next 30 days.

The Mikrotik RouterOS web server allows memory corruption in releases before Stable 6.38.5 and Long-term 6.37.5, aka Chimay-Red. A remote and unauthenticated user can trigger the vulnerability by sending a crafted HTTP request. An attacker can use this vulnerability to execute arbitrary code on the affected system, as exploited in the wild in mid-2017 and later.

Affected products

• MikroTik RouterOS: before 6.37.5 (fixed in 6.37.5); from 6.38, before 6.38.5 (fixed in 6.38.5)

Published 2022-10-15. Last modified 2026-06-17.