Our takeCISA reports active exploitation of an integer underflow in MikroTik RouterOS <7.24 (CVE-2026-84411) that can lead to remote code execution or denial of service. Patch to 7.24 or later on every device you manage.Cyber Resilience desk
Sources (1)
- cisa_advisories · cisa_advisories
What this means for you — Security leader:CISA reports active exploitation of CVE-2026-84411 (integer underflow) in MikroTik RouterOS <7.24 that can lead to remote code execution or DoS. Update immediately to 7.24 or later and audit all MikroTik edge devices.
What this means for you — Lean IT orgs:If you run a MikroTik router, update it right now to version 7.24 or newer. This flaw lets attackers take it over or knock it offline and CISA says it is already being used in the wild.
What this means for you — MSP:Audit every client MikroTik RouterOS instance; versions below 7.24 are under active exploitation per CISA (CVE-2026-84411, RCE/DoS). Patch to 7.24+ or replace the device.
What this means for you — Researcher:CISA advisory ICSA-26-272-06 flags CVE-2026-84411 (integer underflow) in MikroTik RouterOS <7.24 as actively exploited for RCE or DoS. Patch to 7.24+ and rotate any exposed credentials.