What’s Vulnerable › Vulnerabilities

CVE-2020-20221

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-07-21 · updated 2026-06-17
• Weakness: CWE-400

Description

Mikrotik RouterOs before 6.44.6 (long-term tree) suffers from an uncontrolled resource consumption vulnerability in the /nova/bin/cerm process. An authenticated remote attacker can cause a Denial of Service due to overloading the systems CPU.

Affected products

• MikroTik RouterOS: before 6.44.6 — fixed in 6.44.6

How to fix

Upgrade to a fixed version: MikroTik RouterOS 6.44.6. Check the vendor advisory for mitigations.

References

• https://cwe.mitre.org/data/definitions/400.html
• https://seclists.org/fulldisclosure/2020/May/30
• https://seclists.org/fulldisclosure/2021/May/1
• https://cwe.mitre.org/data/definitions/400.html
• https://seclists.org/fulldisclosure/2020/May/30
• https://seclists.org/fulldisclosure/2021/May/1

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