RouterOS versions 6.45.6 Stable, 6.44.5 Long-term, and below are vulnerable to a DNS unrelated data attack. The router adds all A records to its DNS cache even when the records are unrelated to the domain that was queried. Therefore, a remote attacker controlled DNS server can poison the router's DNS cache via malicious responses with additional and untrue records.

References

• https://nvd.nist.gov/vuln/detail/CVE-2019-3979
• https://www.tenable.com/security/research/tra-2019-46