CVE-2020-20237

Name: CVE-2020-20237
Creator: NVD / NIST
Published: 2021-05-18T19:15:07.8+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 2.81%

Last modified Jun 17, 2026

CVE-2020-20237 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. Mikrotik RouterOs 6.46.3 (stable tree) suffers from a memory corruption vulnerability in the /nova/bin/sniffer process. An authenticated remote attacker can cause a Denial of Service due to improper memory access.. EPSS estimates a 2.81% chance of exploitation in the next 30 days.

Description

Mikrotik RouterOs 6.46.3 (stable tree) suffers from a memory corruption vulnerability in the /nova/bin/sniffer process. An authenticated remote attacker can cause a Denial of Service due to improper memory access.

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

2.81%

84.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Mikrotik	Routeros	6.46.3

References

http://packetstormsecurity.com/files/162513/Mikrotik-RouterOS-6.46.5-Memory-Corruption-Assertion-Failure.htmlExploit, Third Party Advisory, VDB Entry
http://seclists.org/fulldisclosure/2021/May/15Exploit, Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2021/May/15Exploit, Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2021/May/15Exploit, Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2021/May/15Exploit, Mailing List, Third Party Advisory
https://mikrotik.com/Product
http://packetstormsecurity.com/files/162513/Mikrotik-RouterOS-6.46.5-Memory-Corruption-Assertion-Failure.htmlExploit, Third Party Advisory, VDB Entry
http://seclists.org/fulldisclosure/2021/May/15Exploit, Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2021/May/15Exploit, Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2021/May/15Exploit, Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2021/May/15Exploit, Mailing List, Third Party Advisory
https://mikrotik.com/Product

Timeline

Published: May 18, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-20237?

How severe is CVE-2020-20237?

CVE-2020-20237 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 2.81% probability of exploitation in the next 30 days.

How do I fix CVE-2020-20237?

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-2020-20237?

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

Scan your code now

Source: NVD / NIST