CVE Watch11 de set. de 2026

CVE-2026-67277

MikroTik RouterOS Missing Authentication for Critical Function Vulnerability

CVSS

8.2

Alta

EPSS

1.6%

p75

KEV

SIM

10 de set. de 2026

Exploit Today

0-100

Publicado: 5 de set. de 2026 · Última mod.: 11 de set. de 2026 · CWE-306

EPSS · 30d

1.6%EPSS · 30 dias1.6%

2026-10-082026-11-05

Ficha do catálogo KEV

Produto

MikroTik / RouterOS

Vulnerabilidade

MikroTik RouterOS Missing Authentication for Critical Function Vulnerability

Adicionado ao KEV

10 de set. de 2026

Corrigir até

13 de set. de 2026

Uso conhecido em ransomware

Não

Descrição resumida

MikroTik RouterOS contains a missing authentication for critical function vulnerability which allows kernel memory disclosure and denial of service in the btest service.

Ação necessária

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.

Notas

https://mikrotik.com/supportsec/september-2026-vulnerability/ ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-67277

Descrição técnica

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)

Referências oficiais

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