HIGH

CVE-2019-3978

CVSS v3

7.5

HIGH

EPSS Score

10.3 %

exploit probability, as of 2026-10-19

CISA KEV

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2019-3978 yet.

Full record on NVD

Description

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

Technical details

Published: 2019-10-29
Exploit-DB: EDB-47566

Frequently asked questions

What is CVE-2019-3978?

Is CVE-2019-3978 actively exploited?

Active exploitation of CVE-2019-3978 has not been confirmed. Its EPSS score was 10.3% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-3978?

CVE-2019-3978 has a CVSS v3 base score of 7.5 (HIGH severity).

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