How severe is CVE-2021-20791?

CVE-2021-20791 has a CVSS 3.x base score of 9.3, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability none.

Is CVE-2021-20791 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-20791?

CVE-2021-20791 affects Jscom Revoworks Browser. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-20791?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-20791 published?

CVE-2021-20791 was published on 2021-09-17 and last updated on 2026-06-17.

CVE-2021-20791

CVE-2021-20791 is a critical-severity vulnerability in Jscom Revoworks Browser with a CVSS 3.x base score of 9.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Critical (CVSS 3.x base score 9.3)
CVSS v2: 6.4
EPSS exploit prediction: 1% (53rd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Jscom Revoworks Browser
Published: 2021-09-17
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2021-20791?: 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.
How severe is CVE-2021-20791?: CVE-2021-20791 has a CVSS 3.x base score of 9.3, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability none.
Is CVE-2021-20791 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-20791?: CVE-2021-20791 affects Jscom Revoworks Browser. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-20791?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-20791 published?: CVE-2021-20791 was published on 2021-09-17 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:jscom:revoworks_browser:*:*:*:*:*:*:*:*

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