CVE-2026-84411
MikroTik RouterOS Integer Underflow
CVSS Score
9.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-191 |
| Vendor | mikrotik |
| Product | routeros |
| Published | Oct 2, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
MikroTik / RouterOS
0 < 7.24