What’s Vulnerable › Vulnerabilities

CVE-2019-3981

• Severity: low (CVSS 3.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-01-14 · updated 2026-06-17
• Weakness: CWE-300

Description

MikroTik Winbox 3.20 and below is vulnerable to man in the middle attacks. A man in the middle can downgrade the client's authentication protocol and recover the user's username and MD5 hashed password.

Affected products

• MikroTik RouterOS: before 6.43 — fixed in 6.43
• MikroTik WinBox: before 3.20 — fixed in 3.20

How to fix

Upgrade to a fixed version: MikroTik RouterOS 6.43; MikroTik WinBox 3.20. Check the vendor advisory for mitigations.

References

• https://www.tenable.com/security/research/tra-2020-01
• https://www.tenable.com/security/research/tra-2020-01

Get alerted when CVE-2019-3981 or the next vulnerability affects your stack