CVE-2021-20791: Improper access control vulnerability in RevoWorks Browser 2.1.230 and earlier allows an attacker to bypass ac

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CRITICAL 9.3REMOTEUPGRADE

CVE-2021-20791 is a critical-severity flaw (CVSS 9.3) affecting revoworks browser. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Improper access control vulnerability in RevoWorks Browser 2.1.230 and earlier allows an attacker to bypass access restriction and to exchange unauthorized files between the local environment and the isolated environment or settings of the web browser via unspecified vectors.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.3 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.8% (top 42%)
CISA exploited list	No
Published	2021-09-17
Last modified	2026-06-17

Publisher (CNA): JPCERT/CC · Vendor: jscom

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-09-17 02:15 UTCPublished CVE record published
2026-06-17 03:34 UTCUpdated Record last modified

jscom revoworks browser UPGRADE

Affected: >= 2.1.197 and <= 2.1.230

Fixed in: newer than 2.1.230

Safe to downgrade to: a release before 2.1.197

1. Check installed version

apt-cache policy revoworks-browser || rpm -q revoworks-browser || revoworks-browser --version

2. UPGRADE to newer than 2.1.230 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade revoworks-browser

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade revoworks-browser

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 2.1.197 (Debian / Ubuntu)

apt-cache madison revoworks-browser sudo apt install revoworks-browser=<VERSION_BEFORE_2.1.197> sudo apt-mark hold revoworks-browser

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list revoworks-browser sudo dnf downgrade revoworks-browser-<VERSION_BEFORE_2.1.197> sudo dnf versionlock add revoworks-browser

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-20791?

revoworks browser: upgrade to newer than 2.1.230. Exact commands for each OS are on this page.

Is CVE-2021-20791 being exploited?

CVE-2021-20791 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-20791 affect?

CVE-2021-20791 affects revoworks browser. Severity is critical (CVSS 9.3). Improper access control vulnerability in RevoWorks Browser 2.1.230 and earlier allows an attacker to bypass access restriction and to exchange unauthorized files between the local environment and the isolated environment or settings of the

How urgent is CVE-2021-20791?

Priority 52/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2022-27176 HIGH 7.8 UPGRADE UPGRADE Incomplete filtering of special elements vulnerability exists in RevoWorks SCVX using 'File Sanitization Libra
CVE-2021-20790 CRITICAL 9.6 UPGRADE Improper control of program execution vulnerability in RevoWorks Browser 2.1.230 and earlier allows an attacke

References

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