CriticalCritical vulnerability

CVE-2026-84411 (CVSS 9.3)

NVD · officialPublished Oct 2, 2026Risk 50/100EPSS 0.9%

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.

Technical details

CVSS

9.3

AV:NetworkAC:LowPR:NoneUI:None

Evidence and sources

This record is attributed to NVD. Exploitation status and remediation guidance are kept separate from the vulnerability's technical severity.

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