THREATPORT/VULNERABILITY/CVE-2019-3978
HIGH SEVERITY

CVE-2019-3978

Routeros vulnerability

CVSS
7.5
EPSS
10.3%
EPSS pct
95th
Exploited
No known
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 vendor
Mikrotik
Affected product
Routeros
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Weakness type (CWE)
  • CWE-306 — Missing Authentication for Critical Function
Published
2019-10-29

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to integrity.

Its EPSS score of 10.3% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 95% of all scored CVEs.

Check your external exposure to CVE-2019-3978

  • Confirm whether Mikrotik Routeros is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2019-3978.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2019-3978

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2019-3978 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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