How severe is CVE-2021-20066?

CVE-2021-20066 has a CVSS 3.x base score of 5.6, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2021-20066 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-20066?

CVE-2021-20066 affects Jsdom Project Jsdom. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-20066?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-20066 published?

CVE-2021-20066 was published on 2021-02-16 and last updated on 2026-06-17.

CVE-2021-20066

CVE-2021-20066 is a medium-severity vulnerability in Jsdom Project Jsdom with a CVSS 3.x base score of 5.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 5.6)
CVSS v2: 6.8
EPSS exploit prediction: 1% (69th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Jsdom Project Jsdom
Published: 2021-02-16
Last modified: 2026-06-17

Description

JSDom improperly allows the loading of local resources, which allows for local files to be manipulated by a malicious web page when script execution is enabled.

Frequently asked questions

What is CVE-2021-20066?: JSDom improperly allows the loading of local resources, which allows for local files to be manipulated by a malicious web page when script execution is enabled.
How severe is CVE-2021-20066?: CVE-2021-20066 has a CVSS 3.x base score of 5.6, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2021-20066 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-20066?: CVE-2021-20066 affects Jsdom Project Jsdom. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-20066?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-20066 published?: CVE-2021-20066 was published on 2021-02-16 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:jsdom_project:jsdom:-:*:*:*:*:*:*:*