CVE-2026-67277: MikroTik RouterOS Missing Authentication for Critical Function
This MikroTik advisory covers CVE-2026-67277 in MikroTik RouterOS.
- CVE-2026-67277
Key facts
- Vendor rating
- High, CVSS 8.8
- CISA KEV
- Listed ; federal due date
- Affected
- RouterOS 7.24 before 7.24.2; RouterOS 7.0.0 before 7.23.4; RouterOS 6.0.0 before 6.49.21
- Fixed in
- 7.24.2, 7.23.4, 6.49.21
- Source published
- Listed by VulniPulse
Compiled by VulniPulse from the linked sources. How records are collected and checked.
Affected products & platforms
CVE-2026-67277 in the CISA Known Exploited Vulnerabilities catalog
- CISA name:
- MikroTik RouterOS Missing Authentication for Critical Function Vulnerability
- CISA 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.
Description
MikroTik has found a security vulnerability in RouterOS and releases containing a fix have been published in all channels. This is an important security update.
Most configurations are not at risk, but upgrading is highly recommended. To give time to update your systems, we are not currently publishing detailed information.
Your device should already give you the option to upgrade software in the “Check for updates” menu. Fix is included in: 7.25 beta 3.
7.24.2. 7.23.4.
6.49.21. For regular home device users the issue does not pose an immediate risk, but we still suggest all users to upgrade.
Steps to be taken Make sure SSH is not open to any untrusted networks. MikroTik default configuration blocks this port from the internet by default, but if you have manually opened this port, make sure only trusted IP can access it, or better yet, use a strong VPN like WireGuard to access your router and do not open any management ports at all.
RouterOS will check if your device has been compromised, and set it to “Flagged” status if it is. This will be written in the “Log” section.
Affected product named by the advisory: MikroTik RouterOS.
Text from the source record.
- RouterOS 7.24 before 7.24.2
- RouterOS 7.0.0 before 7.23.4
- RouterOS 6.0.0 before 6.49.21
Official advisory · high-confidence parse· fetched ·verify at source
How to fix CVE-2026-67277
Upgrade to a fixed release named by MikroTik:
- 7.24.2
- 7.23.4
- 6.49.21
Support dates for the fixed release lines
- MikroTik RouterOS 6.49: support ended
More MikroTik advisories
CVE-2026-98432Nov 3, 2026MikroTik RouterOS: memory handling vulnerability has been identified in the Linux kernelCVE-2026-88464Oct 20, 2026MikroTik RouterOS: stack buffer overflow vulnerability has been identified in the SNMPCVE-2026-89020Sep 14, 2026MikroTik RouterOS before 7.23.4 (long-term) and 7.24.2 (stable) contains a stack-basedCVE-2026-86060Sep 5, 2026SSH session privilege manipulation via a crafted username in Mikrotik RouterOSCVE-2026-67281Sep 5, 2026Unauthenticated file read in Mikrotik RouterOSCVE-2026-67279Sep 5, 2026SSH Pre-Authentication Rekey State Bypass in MikroTik RouterOS
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