#VU52988 NULL pointer dereference in MikroTik RouterOS - CVE-2020-20222

Vulnerability identifier: #VU52988

Vulnerability risk: Low

CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-20222

CWE-ID: CWE-476

Exploitation vector: Network

Exploit availability: No

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

Vendor: MikroTik

Description

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

The vulnerability exists due to a NULL pointer dereference error within the sniffer process. A remote authenticated user can pass specially crafted data to the system and perform a denial of service (DoS) attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

MikroTik RouterOS: 6.40 - 6.40.9, 6.41 - 6.41.4, 6.42 - 6.42.12, 6.43 - 6.43.16, 6.44 - 6.44.6, 6.45 - 6.45.9, 6.46 - 6.46.8, 6.47 - 6.47.9, 6.48 - 6.48.2

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External links
https://seclists.org/fulldisclosure/2021/May/15

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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