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)
Explotada activamente
- En el catálogo CISA de vulnerabilidades explotadas desde el 10 sept 2026
- Las agencias federales de EE. UU. deben corregirla antes del 13 sept 2026 (BOD 22-01)
- Atacada 1 día antes de que la vulnerabilidad se hiciera pública
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Fuente: CISA KEV · 10 sept 2026 5 sept 2026
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:HProductos afectados
| Fabricantes | Producto | Versiones |
|---|---|---|
| mikrotik | routeros | < 6.49.21 |
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This product uses the NVD API but is not endorsed or certified by the NVD.