What is CVE-2021-20736?

CVE-2021-20736 is a critical-severity vulnerability in Weseek Growi, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 9.1/10. Published 2021-06-22.

How severe is CVE-2021-20736?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Vulnerability in Weseek Growi

CVE-2021-20736

NoSQL injection vulnerability in GROWI versions prior to v4.2.20 allows a remote attacker to obtain and/or alter the information stored in the database via unspecified vectors.

Published 2021-06-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.013 (69.4th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 69th percentile — 69.4% 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

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

Weakness classification (CWE)

CWE-74 — Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection)

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-2021-20736?: CVE-2021-20736 is a critical-severity vulnerability in Weseek Growi, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 9.1/10. Published 2021-06-22.
How severe is CVE-2021-20736?: Critical severity. CVSS v3 base score is 9.1 out of 10.