Vulnerability identifier: #VU46736

Vulnerability risk: Medium

CVSSv3.1: 6.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2020-11881

CWE-ID: CWE-129

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
MikroTik RouterOS
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor: MikroTik

Description

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

The vulnerability exists due to improper validation of array index when processing setup-requests in a built-in SMB server. A remote non-authenticated attacker can send specially crafted setup-request packets and crash the SMB server.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

MikroTik RouterOS: 6.47 - 6.47.3, 6.45 - 6.45.9, 6.46 - 6.46.7, 6.44 - 6.44.6, 6.43 - 6.43.16, 6.42 - 6.42.12, 6.41.3 - 6.41.4

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External links
http://github.com/botlabsDev/CVE-2020-11881

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Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.