What is CVE-2021-20737?

CVE-2021-20737 is a medium-severity vulnerability in Weseek Growi, classified under Improper Authentication. CVSS score: 6.5/10. Published 2021-06-22.

How severe is CVE-2021-20737?

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

Auth bypass in Weseek Growi

CVE-2021-20737

Improper authentication vulnerability in GROWI versions prior to v4.2.20 allows a remote attacker to view the unauthorized pages without access privileges via unspecified vectors.

Vulnerability class: Broken Authentication

Published 2021-06-22 · 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:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.011 (63.0th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 63rd percentile — 63.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Weseek Growi
Weseek, Inc. Growi — versions versions prior to v4.2.20

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

weseek.co.jp/security/2021/06/14/vulnerability/growi-nosql-ingection/ (Vendor Advisory)
jvn.jp/en/jp/JVN95457785/index.html (Third Party Advisory)

Frequently asked questions

What is CVE-2021-20737?: CVE-2021-20737 is a medium-severity vulnerability in Weseek Growi, classified under Improper Authentication. CVSS score: 6.5/10. Published 2021-06-22.
How severe is CVE-2021-20737?: Medium severity. CVSS v3 base score is 6.5 out of 10.