VULNERABILITY INTELLIGENCE

CVE-2026-67277

CVSS score8.2 HIGH
EPSS probability1.56%
CISA KEVKnown exploited vulnerability
Published2026-09-05
Last modified2026-09-11
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

Known Exploited Vulnerability

MikroTik RouterOS Missing Authentication for Critical Function Vulnerability

Vendor / product: MikroTik / RouterOS

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 (Long-term), 7.23.4 (Long-term) and 7.24.2 (Stable)

Weakness classification

  • cvd@cert.pl: CWE-306

Primary references