CVE-2021-20790

Arbitrary code execution across isolation boundary

Published Sep 17, 2021 · Updated Aug 3, 2024

Improper program execution control in J's Communications RevoWorks Browser 2.1.230 and earlier allows attackers to execute code via user action. The vendor has not disclosed the triggering input or code locus beyond identifying improper program-execution control at the local-to-isolated boundary. User interaction is required, and resulting commands or code execute in the user's browser inside the isolated environment.

CVSS severity8.6
High
EPSS probability1.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper program execution control in J's Communications RevoWorks Browser 2.1.230 and earlier allows attackers to execute code via user action. The vendor has not disclosed the triggering input or code locus beyond identifying improper program-execution control at the local-to-isolated boundary. User interaction is required, and resulting commands or code execute in the user's browser inside the isolated environment.

The record

CVE
CVE-2021-20790
Published
Sep 17, 2021
Updated
Aug 3, 2024
Vendor
J's Communications Co., Ltd.
Product
RevoWorks Browser
Classifications
CWE-114, T1204
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 17, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.1.230 and earlier

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

J's Communications Co., Ltd. · RevoWorks Browserversion=2.1.230 and earlier

Published CVSS scores

8.6JPCERT/CC and IPACVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
6.8JPCERT/CC and IPAAV:N/AC:M/Au:N/C:P/I:P/A:P
9.6NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-114Process Control
T1204User Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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