CVE-2017-6444: MikroTik RouterOS

High severity, CVSS 7.5. EPSS: 13.5% chance of exploitation in the next 30 days.

The MikroTik Router hAP Lite 6.25 has no protection mechanism for unsolicited TCP ACK packets in the case of a fast network connection, which allows remote attackers to cause a denial of service (CPU consumption) by sending many ACK packets. After the attacker stops the exploit, the CPU usage is 100% and the router requires a reboot for normal operation.

Affected products

• MikroTik RouterOS: version 6.25 only

Published 2017-03-12. Last modified 2026-06-17.