Integer overflow in MikroTik RouterOS - CVE-2026-84411
Published: October 17, 2026
Vulnerability identifier: #VU156089
CSH Severity: Critical
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-84411
CWE-ID: CWE-190
Exploitation vector: Remote access
Exploit availability:
The vulnerability is being exploited in the wild
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to integer overflow within the administrative interface. A remote attacker can send specially crafted HTTP requests to the management interface of the device, trigger an integer overflow and execute arbitrary code on the target system.
Note, the vulnerability is being actively exploited in the wild.
Affected software
MikroTik RouterOS
How to mitigate CVE-2026-84411
Install updates from vendor's website.
MikroTik RouterOS - addressed in versions 6.49.23, 7.23.8