CVE-2026-84411: CWE-191 in MikroTik RouterOS
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.
CVE-2026-84411: CWE-191 in MikroTik RouterOS
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.
CVSS v3.1
Score 9.8critical
Affected software
MikroTik
RouterOS
Weaknesses
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- icscert
- Date Reserved
- 2026-09-01T17:04:29.818Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ac030c6a43b0b3b890d099b
Added to database: 10/02/2026, 22:31:34 UTC
Last updated: 10/02/2026, 22:31:34 UTC
Views: 1
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