CVE-2020-20254

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.1% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-05-18 · updated 2026-06-17
Weakness: CWE-787

Description

Mikrotik RouterOs before 6.47 (stable tree) suffers from a memory corruption vulnerability in the /nova/bin/lcdstat process. An authenticated remote attacker can cause a Denial of Service (NULL pointer dereference).

Affected products

MikroTik RouterOS: before 6.47 — fixed in 6.47

How to fix

Upgrade to a fixed version: MikroTik RouterOS 6.47. Check the vendor advisory for mitigations.

References

http://seclists.org/fulldisclosure/2021/May/14
http://seclists.org/fulldisclosure/2021/May/14
http://seclists.org/fulldisclosure/2021/May/14
http://seclists.org/fulldisclosure/2021/May/14
https://github.com/cq674350529/pocs_slides/blob/master/pocs/MikroTik/vul_lcdstat_2/README.md
http://seclists.org/fulldisclosure/2021/May/14
http://seclists.org/fulldisclosure/2021/May/14
http://seclists.org/fulldisclosure/2021/May/14
http://seclists.org/fulldisclosure/2021/May/14
https://github.com/cq674350529/pocs_slides/blob/master/pocs/MikroTik/vul_lcdstat_2/README.md

Get alerted when CVE-2020-20254 or the next vulnerability affects your stack