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CVE-2026-84411

Critical

Description

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.

SeverityCritical
CVSS9.8
Exploit probability—
ProductRouterOS
PublishedOct 2, 2026
First seenOct 2, 2026
Weakness typeCWE-191CWE-191

How to fix

Update
  • MikroTik RouterOS7.24 or later

Affected products

ProductAffected versionsFixed in
MikroTik RouterOSv < 7.247.24

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