CVE-2026-67277 is a vulnerability classified as Missing Authentication for Critical Function, affecting RouterOS (affected versions: 7.24 – < 7.24.2, 7.0.0 – < 7.23.4, and other affected versions). This vulnerability is rated High, with a CVSS score of 8.8. This vulnerability has been observed being exploited in the wild.
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RouterOS accepts a "related" btest connection before the corresponding primary session has completed authentication. An unauthenticated client can use this state to start an IPv4 UDP test. With "random-data=false", the sender transmits an uninitialized tail from a kernel packet buffer. A separate unchecked, inverted packet-size interval causes unsigned integer underflow, anomalously large fragmented output, and can restart the RouterOS kernel.
This issue was fixed in versions: 6.49.21 (Long-term), 7.23.4 (Long-term) and 7.24.2 (Stable)
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