Live › vulnerability › CVE-2026-67277
Go to dashboardRouterOS btest (bandwidth-test) service accepts a 'related' connection before the primary session authenticates. An unauthenticated remote client can start an IPv4 UDP test and read uninitialized kernel packet-buffer memory (random-data=false). An unchecked inverted packet-size interval causes an integer underflow that can restart the kernel. One of six CERT.pl 'MikroTrick' issues. CISA KEV lists it as exploited.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 19:11 UTC, 5h before NVD. All times on this page are UTC.
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.
| Product | Ecosystem | Affected | Fixed in |
|---|---|---|---|
| RouterOS | vendor | >= 6.0.0, < 6.49.21; >= 7.0.0, < 7.23.4; >= 7.24, < 7.24.2 | 6.49.21, 7.23.4, 7.24.2, 7.24.3, 7.23.6 |
| mikrotik routeros | vendor | >= 6.0, < 6.49.21 | 6.49.21 |
| mikrotik routeros | vendor | >= 7.0, < 7.23.4 | 7.23.4 |
| mikrotik routeros | vendor | >= 7.24, < 7.24.2 |
| 7.24.2 |
| MikroTik RouterOS | vendor | – | – |
6.0.0 to before 6.49.21, 7.0.0 to before 7.23.4, 7.24 to before 7.24.27.24.3 (stable), 7.23.6 (long-term) or 6.49.21 or later7.24.2 and 7.23.4Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
@Shadowserver · X3 likes · 1 reposts2026-09-13 16:28“These should not be publicly accessible on the Internet due to potential vulnerabilities, such as the recent CVE-2026-67277 https://t.co/IiWG9VsMIU You can find all our MikroTik detections in Device ID report https://t.co/1uPaaDBimE (around 3M daily): https://t.co/ilWjNmiz5k”
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Posts are quoted with a link to the original. They are data to us, never instructions.
MikroTik RouterOS contains a missing authentication for critical function vulnerability which allows kernel memory disclosure and denial of service in the btest service.
CISA 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.
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