Vulnerability Intelligence Report
Kernel memory disclosure and denial of service in MikroTik RouterOS btest service
CVE-2026-67277
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)
CISA KEV
SSVC: Active Exploitation
Automatable
CVSS Base Score
8.8
HIGH
EPSS Probability:0.43%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-306 ↗CWE-306 Missing authentication for critical function
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Mikrotik | RouterOS | 7.24 < 7.24.2 (affected), 7.0.0 < 7.23.4 (affected), 6.0.0 < 6.49.21 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | CERT.PL · CERT · Poland |
| Reserved | 2026-07-29T11:59:30 |
| Published | 2026-09-05T20:00:56 |
| Last Updated | 2026-09-11T03:55:58 |
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