MikroTik RouterOS: Schwachstelle ermöglicht Denial of Service
WID-SEC-2026-3523 · first 23.09.2026 · updated 23.09.2026 · CVSS 7,5
What it is about
MikroTik RouterOS ist ein auf Linux basierendes Betriebssystem, das für MikroTik RouterBOARD Hardware und PC-Installationen entwickelt wurde und umfangreiche Routing-, Firewall- und Netzwerkverwaltungsfunktionen bietet. Ein entfernter, anonymer Angreifer kann eine Schwachstelle in MikroTik RouterOS ausnutzen, um einen Denial of Service Angriff durchzuführen.
Under what conditions?
Over the network and without logging in. This is the most dangerous combination: attackers can scan reachable devices automatically.
What can happen in the worst case
An attacker could use the vulnerability to
- einen Denial of Service Angriff durchzuführen
Am I affected?
Affected according to the BSI:
- MikroTik RouterOS
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
According to the BSI there is no update yet. The vendor notices below name interim protective measures, if any.
Is the vulnerability already being exploited?
None of the CVEs is in the CISA catalogue of exploited vulnerabilities. That does not mean there are no attacks, only that none are documented.
Information and sources
CVE: CVE-2026-93345
Source: BSI warning and information service (CERT-Bund); CISA. The assessment of the conditions is my reading of the BSI text; the external pages are in their original language.