Denial of service in MikroTik RouterOS

Published: 2019-02-25
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2019-3924
Exploitation vector Network
Public exploit N/A
Vulnerable software
MikroTik RouterOS
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor MikroTik

Security Advisory

This security advisory describes one medium risk vulnerability.

1) Input validation error

Risk: Medium

CVSSv3: 5.2 [CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2019-3924

CWE-ID: CWE-20 - Improper Input Validation

Exploit availability: No


The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input within the Winbox service. A remote attacker can send a specially crafted request to the affected service and trigger denial of service conditions.

Successful exploitation of the vulnerability requires that the Winbox service is exposed to the attacker.


Install updates from vendor's website.

Vulnerable software versions

MikroTik RouterOS: 6.42, 6.42.1, 6.42.2, 6.42.3, 6.42.4, 6.42.5, 6.42.6, 6.42.7, 6.42.9, 6.42.10, 6.42.11, 6.43.1, 6.43.2, 6.43.3, 6.43.4, 6.43.5, 6.43.6, 6.43.7, 6.43.8, 6.43.9, 6.43.10, 6.43.11

CPE External links

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected device in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.