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Vulnerabilities

Vulnerability · CVE-2019-3924

MikroTik RouterOS before 6.43.12 (stable) and 6.42.12 (long-term) is vulnerable to an intermediary vulnerability.

Published Feb 20, 2019 · catalog updated Jun 17, 2026 · MikroTik RouterOS before 6.43.12

Last checked Nov 9, 2026. A connected source was read within the last 7 days.

Check this week

CVE-2019-3924 is not in CISA KEV. FIRST estimates a 15.70% chance of exploitation in the next 30 days. Check whether you run MikroTik RouterOS before 6.43.12.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (MikroTik RouterOS before 6.43.12).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
15.70%
Remediation
Version ranges on file
Affected products
cpe mikrotik/routeros

MikroTik RouterOS before 6.43.12 (stable) and 6.42.12 (long-term) is vulnerable to an intermediary vulnerability. The software will execute user defined network requests to both WAN and LAN clients. A remote unauthenticated attacker can use this vulnerability to bypass the router's firewall or for general network scanning activities.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe mikrotik/routeros< 6.42.12
  • cpe mikrotik/routeros< 6.43.12

How to fix CVE-2019-3924

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2019-3924 is not in CISA KEV. FIRST estimates a 15.70% chance of exploitation in the next 30 days. Check whether you run MikroTik RouterOS before 6.43.12.

Which versions are affected?

Compare what you have installed with < 6.42.12, < 6.43.12. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-441. EPSS 15.70%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

MikroTik RouterOS security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Feb 20, 2019 · Monitored products — high

    Detected

    MikroTik RouterOS before 6.43.12 (stable) and 6.42.12 (long-term) is vulnerable to an intermediary vulnerability. The software will execute user defined network requests to both WAN and LAN clients. A remote unauthenticated attacker can use this vulnerability to bypass the router's firewall or for general network scanning activities.

  2. Jun 17, 2026 · Monitored products — high

    Updated

    MikroTik RouterOS before 6.43.12 (stable) and 6.42.12 (long-term) is vulnerable to an intermediary vulnerability. The software will execute user defined network requests to both WAN and LAN clients. A remote unauthenticated attacker can use this vulnerability to bypass the router's firewall or for general network scanning activities.

Sources

  • CVE.orgVulnerability recordCVE-2019-3924

    Official CVE identifier

    cve.org
  • Monitored products — highVendor advisoryCVE-2019-3924

    MikroTik RouterOS before 6.43.12 (stable) and 6.42.12 (long-term) is vulnerable to an intermediary vulnerability. The software will execute user defined network requests to both WAN and LAN clients. A remote unauthenticated attacker can use this vulnerability to bypass the router's firewall or for general network scanning activities.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Nov 9, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • CVE.orgNov 6, 2026
  • Monitored products — highNov 6, 2026