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Critical · 9.8 Public exploit CVE-2026-84411 EUVD-2026-91836GHSA-xj4h-hf2x-2q43

MikroTik RouterOS Integer Underflow

Published Oct 2, 2026 · Updated Oct 3, 2026 · Assigned by icscert

Vendor: MikroTik Product: RouterOS Category: Network devices

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.

Affected products

VendorProductAffectedFixed
MikroTik RouterOS < 7.24 7.24

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 2 repositories

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

Advisories 2

References