What is CVE-2021-20758?

CVE-2021-20758 is a high-severity vulnerability in Cybozu Garoon, classified under Cross-Site Request Forgery (CSRF). CVSS score: 8.0/10. Published 2021-08-18.

How severe is CVE-2021-20758?

High severity. CVSS v3 base score is 8.0 out of 10.

CSRF in Cybozu Garoon

CVE-2021-20758

Cross-site request forgery (CSRF) vulnerability in Message of Cybozu Garoon 4.0.0 to 5.0.2 allows a remote authenticated attacker to hijack the authentication of administrators and perform an arbitrary operation via unspecified vectors.

Vulnerability class: CSRF (Cross-Site Request Forgery)

Published 2021-08-18 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.0 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.005 (39.5th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 39.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Cybozu Garoon
Cybozu, Inc. Cybozu Garoon — versions 4.0.0 to 5.0.2

Weakness classification (CWE)

CWE-352 — Cross-Site Request Forgery (CSRF)

References

cs.cybozu.co.jp/2021/007206.html (Vendor Advisory)
jvn.jp/en/jp/JVN54794245/index.html (Third Party Advisory)

Frequently asked questions

What is CVE-2021-20758?: CVE-2021-20758 is a high-severity vulnerability in Cybozu Garoon, classified under Cross-Site Request Forgery (CSRF). CVSS score: 8.0/10. Published 2021-08-18.
How severe is CVE-2021-20758?: High severity. CVSS v3 base score is 8.0 out of 10.