What is CVE-2020-22844?

CVE-2020-22844 is a high-severity vulnerability in Mikrotik Routeros, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 7.5/10. Published 2022-02-28.

How severe is CVE-2020-22844?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Mikrotik Routeros

CVE-2020-22844

A buffer overflow in Mikrotik RouterOS 6.47 allows unauthenticated attackers to cause a denial of service (DOS) via crafted SMB requests.

Published 2022-02-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.012 (67.8th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 68th percentile — 67.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Mikrotik Routeros — versions 6.47

Weakness classification (CWE)

CWE-401 — Missing Release of Memory after Effective Lifetime

References

mikrotik.com/support (Vendor Advisory)
github.com/colorlight/mikrotik_poc/blob/master/two_vulns.md (Third Party Advisory)

Frequently asked questions

What is CVE-2020-22844?: CVE-2020-22844 is a high-severity vulnerability in Mikrotik Routeros, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 7.5/10. Published 2022-02-28.
How severe is CVE-2020-22844?: High severity. CVSS v3 base score is 7.5 out of 10.