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Servers and applications

CVE-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.

Severity
High 7.5
Published
20 Feb 2019
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
6.42.12, 6.43.12
Exploit chance
16% in the next 30 daysHigher than 96% of CVEs. EPSS by FIRST, 10 Nov 2026
Sources
NVD

Affected software

SoftwareAffected versions
MikroTik RouterOSServers and applications · cpe:o:mikrotik:routeros
  • Every version before 6.42.12
  • Every version before 6.43.12

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2019-3924
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2019-3924