What is CVE-2021-20790?

CVE-2021-20790 is a critical-severity vulnerability in Jscom Revoworks Browser. CVSS score: 9.6/10. Published 2021-09-17.

How severe is CVE-2021-20790?

Critical severity. CVSS v3 base score is 9.6 out of 10.

Vulnerability in Jscom Revoworks Browser

CVE-2021-20790

Improper control of program execution vulnerability in RevoWorks Browser 2.1.230 and earlier allows an attacker to execute an arbitrary command or code via unspecified vectors.

Published 2021-09-17 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.013 (68.6th percentile), scored 2026-10-03.

Low probability of exploitation in the next 30 days, but still tracked. 69th percentile — 68.6% 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

Jscom Revoworks Browser
J’s Communication Co., Ltd. Revoworks Browser — versions 2.1.230 and earlier

References

jscom.jp/news-20210910_2/ (Vendor Advisory)
jvn.jp/en/jp/JVN81658818/index.html (Third Party Advisory)

Frequently asked questions

What is CVE-2021-20790?: CVE-2021-20790 is a critical-severity vulnerability in Jscom Revoworks Browser. CVSS score: 9.6/10. Published 2021-09-17.
How severe is CVE-2021-20790?: Critical severity. CVSS v3 base score is 9.6 out of 10.