CISA warns of critical pre-auth RCE flaw in MikroTik RouterOS
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The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has issued a warning about a critical pre-authentication remote code execution vulnerability, CVE-2026-84411, in MikroTik RouterOS. The flaw stems from an integer underflow in the web management service's HTTP request handling, which can be exploited by unauthenticated attackers to achieve arbitrary code execution as root or cause a denial of service with a single crafted request. Affected versions are RouterOS releases prior to 7.24, with mitigation advised through updating to version 7.23 or later. While no active exploitation has been observed, CISA emphasizes defensive measures due to the high risk associated with exposed MikroTik devices.
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