What’s Vulnerable › Vulnerabilities

CVE-2019-3924

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 15.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2019-02-20 · updated 2026-06-17
• Weakness: CWE-441

Description

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.

Affected products

• MikroTik RouterOS: before 6.42.12; before 6.43.12 — fixed in 6.42.12, 6.43.12

How to fix

Upgrade to a fixed version: MikroTik RouterOS 6.42.12, 6.43.12. Check the vendor advisory for mitigations.

References

• http://www.securityfocus.com/bid/107177
• https://www.exploit-db.com/exploits/46444/
• https://www.tenable.com/security/research/tra-2019-07
• http://www.securityfocus.com/bid/107177
• https://www.exploit-db.com/exploits/46444/
• https://www.tenable.com/security/research/tra-2019-07

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