What is CVE-2020-20231?

CVE-2020-20231 is a medium-severity vulnerability in Mikrotik Routeros, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2021-07-14.

How severe is CVE-2020-20231?

Medium severity. CVSS v3 base score is 6.5 out of 10.

NULL pointer dereference in Mikrotik Routeros

CVE-2020-20231

Mikrotik RouterOs through stable version 6.48.3 suffers from a memory corruption vulnerability in the /nova/bin/detnet process. An authenticated remote attacker can cause a Denial of Service (NULL pointer dereference).

Published 2021-07-14 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.020 (80.0th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 80th percentile — 80.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.020 · newest: 0.020 · change: 0.000

Affected products

Mikrotik Routeros

Weakness classification (CWE)

References

mikrotik.com/ (Vendor Advisory)
github.com/cq674350529/pocs_slides/blob/master/advisory/MikroTik/CVE-2020-20231… (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2020-20231?: CVE-2020-20231 is a medium-severity vulnerability in Mikrotik Routeros, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2021-07-14.
How severe is CVE-2020-20231?: Medium severity. CVSS v3 base score is 6.5 out of 10.