MikroTik fixes a critical vulnerability

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[TLP:CLEAR] MikroTik fixes a critical vulnerability

MikroTik fixes a critical vulnerability in RouterOS with version 7.24 [1][2].

MikroTik RouterOS - RCE, DoS (CVE-2026-84411)

CVSS 9.3 (Critical)

An unauthenticated remote attacker can execute code as root or perform a DoS attack by sending a single specially crafted HTTP request to the device's web management interface [3].

The vulnerability is present in product:

MikroTik RouterOS; >=0, <7.24;

CVSS: 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

More information:

CVE-2026-84411 at cve.org, NVD
CWE-191: Integer Underflow (Wrap or Wraparound) at cwe.mitre.org

The vulnerability was publicly disclosed 3. 10. 2026.

Links

By CESNET, z.s.p.o. Táňa Macháčková on 5. 10. 2026.

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[TLP:CLEAR] MikroTik fixes a critical vulnerability

MikroTik RouterOS - RCE, DoS (CVE-2026-84411)

CVSS 9.3 (Critical)

Links