What’s Vulnerable › Vulnerabilities

CVE-2020-20266

• 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: 2021-05-19 · updated 2026-06-17
• Weakness: CWE-476

Description

Mikrotik RouterOs before 6.47 (stable tree) suffers from a memory corruption vulnerability in the /nova/bin/dot1x 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

• https://github.com/cq674350529/pocs_slides/blob/master/pocs/MikroTik/vul_dot1x/README.md
• https://seclists.org/fulldisclosure/2021/May/11
• https://github.com/cq674350529/pocs_slides/blob/master/pocs/MikroTik/vul_dot1x/README.md
• https://seclists.org/fulldisclosure/2021/May/11

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