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TI-2019-02983 Aliases CVE-2019-3978GHSA-3m56-p87c-39jp

Missing authentication in MikroTik RouterOS

Priority MEDIUM 45CWE-306Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
None · High · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-306.

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

Why it matters now

EPSS 0.10274 95th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
—MikroTik RouterOSRouterOS 6.45.6 Stable and below. RouterOS 6.44.5 Long-term and below.—No fix listedCNA
  • MikroTik RouterOS Vendor— Affected RouterOS 6.45.6 Stable and below. RouterOS 6.44.5 Long-term and below. Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:o:mikrotik:routeros:*:*:*:*:ltr:*:*:*up to 6.44.5VulnerableMikroTik
cpe:2.3:o:mikrotik:routeros:*:*:*:*:-:*:*:*up to 6.45.6VulnerableMikroTik
  • cpe:2.3:o:mikrotik:routeros:*:*:*:*:ltr:*:*:* Versions up to 6.44.5 Vulnerable ·MikroTik
  • cpe:2.3:o:mikrotik:routeros:*:*:*:*:-:*:*:* Versions up to 6.45.6 Vulnerable ·MikroTik

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2019-3978
  2. 2026-10-03 Alias added: GHSA-3m56-p87c-39jp

References

Advisory 2

  • TI-2018-05369 A buffer overflow was found in the MikroTik RouterOS SMB service when processing NetBIOS… KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-58872 SSH session privilege manipulation via a crafted username in Mikrotik RouterOS KEVCVSS 4.0CRITICAL 9.2
  • TI-2018-10669 MikroTik RouterOS through 6.42 allows unauthenticated remote attackers to read arbitrary… KEVCVSS 3.1CRITICAL 9.1
  • TI-2026-47574 Kernel memory disclosure and denial of service in MikroTik RouterOS btest service KEVCVSS 4.0HIGH 8.8
  • TI-2026-47576 SSH Pre-Authentication Rekey State Bypass in MikroTik RouterOS KEVCVSS 4.0MEDIUM 6.9
  • TI-2022-22302 Out-of-bounds read in MicroTik RouterOS CVSS 3.1CRITICAL 9.8
See all 87 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences