What is CVE-2021-20841?

CVE-2021-20841 is a medium-severity vulnerability in Ec-Cube. CVSS score: 6.5/10. Published 2021-11-24.

How severe is CVE-2021-20841?

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

Vulnerability in Ec-Cube

CVE-2021-20841

Improper access control in Management screen of EC-CUBE 2 series 2.11.2 to 2.17.1 allows a remote authenticated attacker to bypass access restriction and to alter System settings via unspecified vectors.

Published 2021-11-24 · 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:H/A:N.

EPSS exploit prediction

EPSS: 0.013 (69.8th percentile), scored 2026-10-03.

Low probability of exploitation in the next 30 days, but still tracked. 70th percentile — 69.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: +0.000

Affected products

Ec-Cube
Ec-Cube Co.,ltd. 2 Series — versions 2.11.2 to 2.17.1

References

www.ec-cube.net/info/weakness/20211111/ (Exploit, Patch, Vendor Advisory)
jvn.jp/en/jp/JVN75444925/index.html (Third Party Advisory)

Frequently asked questions

What is CVE-2021-20841?: CVE-2021-20841 is a medium-severity vulnerability in Ec-Cube. CVSS score: 6.5/10. Published 2021-11-24.
How severe is CVE-2021-20841?: Medium severity. CVSS v3 base score is 6.5 out of 10.