CVE-2026-84411
The web management service in affected RouterOS versions contains an integer underflow in its HTTP request body handling that is reachable before authentication. This can be leveraged by an unauthenticated network attacker to achieve arbitrary code execution as root, or to cause a denial of service, using a single crafted request.
- Published Oct 2, 2026
- CVSS 9.3 critical
- 0.9% chance of exploitation in the next 30 days (EPSS)
Affected software
In the news
- ⚡ Weekly Recap: NetScaler and FortiMail 0-Days, AI Coding Leaks, Spectre v2 and Ransomware Arrests The Hacker News ·
- MikroTik security advisory (AV26-992) Canadian Centre for Cyber Security ·
- CISA warns of critical pre-auth RCE flaw in MikroTik RouterOS BleepingComputer ·
- MikroTik RouterOS CISA ·