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CVE-2026-67277: MikroTik RouterOS Missing Authentication for Critical Function Vulnerability

MikroTik RouterOS · in CISA KEV since 2026-09-10

2026-09-10added to KEV

2026-09-13federal remediation due date

0.87%EPSS exploit probability (30 days) 57.3th percentile

8.8 HIGHCVSS 4.0

Unknownknown ransomware use

5days from NVD publication to KEV

What it is

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

Required action (CISA)

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.

CWE	CWE-306
CVSS vector	`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`
NVD published	2026-09-05 (Analyzed)

Original records: NVD · CISA KEV · JSON: /api/cve/CVE-2026-67277.json · all KEV CVEs

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