Exploitation active confirmée
Ajoutée au catalogue CISA KEV le 10/09/2026, correctif exigé avant le 13/09/2026 pour les agences fédérales américaines.
Action requise : 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.
Description officielle (NVD)
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)
Références
- https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve , Third Party Advisory
- https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/ , Mitigation, Third Party Advisory
- https://forum.mikrotik.com/t/6-49-21-long-term-is-released/272802 , Release Notes
- https://forum.mikrotik.com/t/7-23-4-long-term-is-released/272801 , Release Notes
- https://forum.mikrotik.com/t/7-24-2-stable-is-released/272800 , Release Notes
- https://mikrotik.com/supportsec/september-2026-vulnerability/ , Vendor Advisory
- https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/ , Exploit, Third Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-67277 , US Government Resource
En bref
| Éditeur | MikroTik |
| Produit | RouterOS |
| Publiée le | 05/09/2026 |
| Modifiée le | 11/09/2026 |
| CVSS | 8.8 (v4.0) |
| EPSS | 1,56 % (centile 75) |
| CWE | CWE-306 |
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS : probabilité estimée d'exploitation dans les 30 prochains jours.
Produits concernés
mikrotik · routeros
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