Search

CVE-2026-67277 - Kernel memory disclosure and denial of service in MikroTik RouterOS btest service

CVE ID : CVE-2026-67277 Published : Sept. 5, 2026, 8:17 p. m. • 28 minutes ago Description : 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 (Lont-term), 7. 23. 4 (Lont-term) and 7. 24. 2 (Stable) Severity: 8.8 • HIGH