CVE-2021-20066: JSDom improperly allows the loading of local resources, which allows for local files to be manipulated by a ma

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MEDIUM 5.6REMOTEMITIGATE

CVE-2021-20066 is a medium-severity flaw (CVSS 5.6) affecting jsdom. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.6 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	1.4% (top 28%)
CISA exploited list	No
Published	2021-02-16
Last modified	2026-06-17

Publisher (CNA): Tenable Network Security, Inc. · Vendor: jsdom project

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

Am I affected?

Timeline

2021-02-16 20:15 UTCPublished CVE record published
2026-06-17 03:33 UTCUpdated Record last modified

jsdom project jsdom MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy jsdom || rpm -q jsdom || jsdom --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

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-2021-20066?

jsdom: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-20066 being exploited?

CVE-2021-20066 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-2021-20066 affect?

CVE-2021-20066 affects jsdom. Severity is medium (CVSS 5.6). 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 urgent is CVE-2021-20066?

Priority 48/100. Public exploit reference; Remotely exploitable, no login, no user action

References

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