CVE-2020-20225

Name: CVE-2020-20225
Creator: NVD / NIST
Published: 2021-07-07T14:15:09.547+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 2.04%

Last modified Jun 17, 2026

CVE-2020-20225 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. Mikrotik RouterOs before 6.47 (stable tree) suffers from an assertion failure vulnerability in the /nova/bin/user process. An authenticated remote attacker can cause a Denial of Service due to an assertion failure via a crafted packet.. EPSS estimates a 2.04% chance of exploitation in the next 30 days.

Description

Mikrotik RouterOs before 6.47 (stable tree) suffers from an assertion failure vulnerability in the /nova/bin/user process. An authenticated remote attacker can cause a Denial of Service due to an assertion failure via a crafted packet.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

2.04%

78.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-617

Affected Software

Vendor	Product	Versions
Mikrotik	Routeros	< 6.47

References

http://seclists.org/fulldisclosure/2021/May/12Mailing List, Third Party Advisory
https://mikrotik.com/Vendor Advisory
http://seclists.org/fulldisclosure/2021/May/12Mailing List, Third Party Advisory
https://mikrotik.com/Vendor Advisory

Timeline

Published: Jul 7, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-20225?

How severe is CVE-2020-20225?

CVE-2020-20225 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 2.04% probability of exploitation in the next 30 days.

How do I fix CVE-2020-20225?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-20225?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST