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Servers and applications

CVE-2019-3979

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.

Severity
High 7.5
Published
29 Oct 2019
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Exploit chance
0.9% in the next 30 daysHigher than 60% of CVEs. EPSS by FIRST, 10 Nov 2026
Sources
NVD

Affected software

SoftwareAffected versions
MikroTik RouterOSServers and applications · cpe:o:mikrotik:routeros
  • Every version up to 6.44.5
  • Every version up to 6.45.6

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2019-3979
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2019-3979