MikroTik RouterOS
View CSAF Summary Successful exploitation of this vulnerability could allow an attacker to achieve remote code execution or cause a denial of service. The following versions of MikroTik RouterOS are affected: RouterOS <7.24 (CVE-2026-84411) CVSS Vendor Equipment Vulnerabilities v3 9.8 MikroTik MikroTik RouterOS Integer Underflow (Wrap or Wraparound) Background Critical Infrastructure Sectors: Communications, Information Technology Countries/Areas Deployed: Worldwide Company Headquarters Location: Latvia Vulnerabilities Expand All + CVE-2026-84411 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. View CVE Details Affected Products MikroTik RouterOS Vendor: MikroTik Product Version: MikroTik RouterOS: <7.24 Product Status: known_affected Remediations Vendor fix MikroTik recommends users update RouterOS to version 7.23 or later. The upgrade can be downloaded from the MikroTik website. https://mikrotik.com/download Relevant CWE: CWE-191 Integer Underflow (Wrap or Wraparound) Metrics CVSS Version Base Score Base Severity Vector String 3.1 9.8 CRITICAL CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H 4.0 9.3 CRITICAL 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 Acknowledgments An anonymous researcher reported this vulnerability to CISA. Legal Notice and Terms of Use This product is provided subject to this Notification (https://www.cisa.gov/notification) and this Privacy & Use policy (https://www.cisa.gov/privacy-policy). Recommended Practices CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Minimize network exposure for all control system devices and/or systems, ensuring they are not accessible from the internet. Locate co CVEs: CVE-2026-84411. Vendors: MikroTik Product Version: MikroTik RouterOS: <7, Google, GitHub, MikroTik. DORA relevance: medium.