RouterOS Integer Underflow in HTTP Body Enables Root Code Exec
CVE-2026-84411 Published on October 2, 2026
MikroTik RouterOS Integer Underflow
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.
Vulnerability Analysis
CVE-2026-84411 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be critical as this vulnerability has a high impact to the confidentiality, integrity and availability of this component.
Weakness Type
What is an Integer underflow Vulnerability?
The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result. This can happen in signed and unsigned cases.
CVE-2026-84411 has been classified to as an Integer underflow vulnerability or weakness.
Products Associated with CVE-2026-84411
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Affected Versions
MikroTik RouterOS:- Before 7.24 is affected.
- Version 7.24 is unaffected.