MikroTik RouterOS is widely deployed network infrastructure; unauthenticated kernel crash/memory leak can disrupt many networks and is reported actively exploited.
CVE-2026-67277
Unauthenticated UDP 'btest' flaw in RouterOS can leak kernel memory and crash routers.
Is CVE-2026-67277 being exploited?
Yes. CVE-2026-67277 appears in CISA's Known Exploited Vulnerabilities catalog, which means exploitation in the wild has been confirmed and reported. Treat it as active rather than theoretical, and patch it ahead of higher-scoring vulnerabilities that carry no exploitation evidence.
How severe is CVE-2026-67277?
CVE-2026-67277 is rated High with a CVSS score of 8.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-67277?
Yes. A fix has been recorded for CVE-2026-67277. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-67277 affect?
CVE-2026-67277 affects MikroTik RouterOS (versions prior to 6.49.21), MikroTik RouterOS (versions prior to 7.23.4), MikroTik RouterOS (versions prior to 7.24.2). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-67277?
Upgrade to 6.49.21 / 7.23.4 / 7.24.2; block btest/UDP from untrusted networks.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated attacker can trigger kernel memory disclosure and cause RouterOS kernel panic/reboot (remote DoS).
Immediate action required
- affected>= 7.24 and < 7.24.2
- affected>= 7.0.0 and < 7.23.4
- affected>= 6.0.0 and < 6.49.21
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.