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CVE-2019-3978

HighPublished

RouterOS versions 6.45.6 Stable, 6.44.5 Long-term, and below allow remote unauthenticated attackers to trigger DNS queries via port 8291. The queries are...

Published: Oct 28, 2019
Updated: Aug 4, 2024
Assigning CNA: tenable
Evidence observed: Oct 31, 2019

Primary CVSS

7.5/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS probability estimate

10.3%

Moderate · next 30 days

Percentile: 95.5%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

RouterOS versions 6.45.6 Stable, 6.44.5 Long-term, and below allow remote unauthenticated attackers to trigger DNS queries via port 8291. The queries are sent from the router to a server of the attacker's choice. The DNS responses are cached by the router, potentially resulting in cache poisoning

Sources

MikroTik RouterOS 6.45.6 - DNS Cache PoisoningExploit
Jacob Baines · hardware · Oct 31, 2019

Responsible use

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