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CVE-2019-3978

HIGHCVSS 7.5/10EPSS 10.27%

Last modified

CVE-2019-3978 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 10.27% chance of exploitation in the next 30 days.

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

Metrics

CVSS 3.1
7.5/10

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

EPSS Probability
10.27%

95.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
MikrotikRouteros<= 6.44.5
MikrotikRouteros<= 6.45.6

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2019-3978?
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
How severe is CVE-2019-3978?
CVE-2019-3978 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 10.27% probability of exploitation in the next 30 days.
How do I fix CVE-2019-3978?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-3978?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST