CVE WatchSep 11, 2026

CVE-2026-67277

MikroTik RouterOS Missing Authentication for Critical Function Vulnerability

CVSS

8.2

High

EPSS

1.6%

p75

KEV

YES

Sep 10, 2026

Exploit Today

0-100

Published: Sep 5, 2026 · Last modified: Sep 11, 2026 · CWE-306

EPSS · 30d

0.9%EPSS · 30 days1.6%

2026-09-222026-10-20

KEV catalog record

Product

MikroTik / RouterOS

Vulnerability

MikroTik RouterOS Missing Authentication for Critical Function Vulnerability

Added to KEV

Sep 10, 2026

Remediate by

Sep 13, 2026

Known ransomware use

Summary description

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

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.

Notes

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

Technical description

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)

Official references

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