How do I check whether my MikroTik RouterOS device is running a version earlier than 7.24?
CISA’s advisory says MikroTik RouterOS versions earlier than 7.24 are affected by CVE-2026-84411. So the practical first step is to find your device’s RouterOS version and compare it with 7.24.
What version counts as affected
According to the advisory, the affected range is:
| Product | Affected version range |
|---|---|
| MikroTik RouterOS | Earlier than 7.24 |
If your device is running RouterOS 7.24 or newer, the provided context says MikroTik recommends that version range as the upgrade target. If it is earlier than 7.24, it falls within the affected range described by CISA.
What the provided advisory does not tell you
The available context does not include step-by-step instructions for where the version appears inside RouterOS. Do not rely on a guess from this post for device-specific menu paths.
Use your device’s management interface or official MikroTik documentation to locate the installed RouterOS version, then compare the number directly with 7.24.
Why the check matters
CISA describes CVE-2026-84411 as an integer underflow in the web management service’s handling of HTTP request bodies before authentication. The advisory says an unauthenticated network attacker could use a specially crafted request to run code as root or cause a denial of service.
Because advisories can be revised, check CISA’s page for the latest wording before making a final call.
What should I do if my MikroTik web management service is exposed to the network?
If your MikroTik web management service is reachable over the network, the key question is whether the device is running an affected RouterOS version.
The practical response
CISA lists RouterOS versions earlier than 7.24 as affected by CVE-2026-84411. MikroTik recommends upgrading RouterOS to version 7.24 or newer.
Based on the provided advisory details, your immediate checklist is simple:
- Check the installed RouterOS version.
- If it is earlier than 7.24, treat it as affected under CISA’s advisory.
- Upgrade RouterOS to 7.24 or newer, following MikroTik’s recommended update path.
Why exposed web management matters
CISA says the issue is in the web management service before authentication. According to the advisory, an unauthenticated network attacker could send one crafted request that may allow code execution as root or denial of service.
The provided context does not include additional network-hardening instructions, so this post should not invent them. For operational changes beyond upgrading, use the official advisory and vendor guidance.
What to verify after reading
Before acting in production, review the latest CISA advisory in case the affected range, mitigation wording, or vendor recommendation has changed.
What changed in the September 29, 2026 CISA advisory for MikroTik RouterOS?
CISA released an ICS advisory for MikroTik RouterOS on September 29, 2026. The advisory centers on CVE-2026-84411.
What the advisory says
The advisory identifies RouterOS versions earlier than 7.24 as affected.
It describes the vulnerability as an integer underflow in the web management service’s handling of HTTP request bodies before authentication.
What the risk is
According to CISA, an unauthenticated network attacker could use one specially crafted request to:
- Run code as root
- Trigger a denial of service
That makes the affected version check important for any device running MikroTik RouterOS.
What MikroTik recommends
The confirmed recommendation in the provided context is to upgrade RouterOS to version 7.24 or newer.
For the most current advisory details, read CISA’s page directly, since security advisories may be updated after publication.
Sources / Learn more
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