CVE-2019-3978

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 10.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2019-10-29 · updated 2026-06-17
Weakness: CWE-306

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

Affected products

MikroTik RouterOS: through 6.44.5; through 6.45.6

References

http://packetstormsecurity.com/files/155036/MikroTik-RouterOS-6.45.6-DNS-Cache-Poisoning.html
https://www.tenable.com/security/research/tra-2019-46
http://packetstormsecurity.com/files/155036/MikroTik-RouterOS-6.45.6-DNS-Cache-Poisoning.html
https://www.tenable.com/security/research/tra-2019-46

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