CVE-2021-23771: This affects all versions of package notevil; all versions of package argencoders-notevil

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MEDIUM 6.5REMOTEUPGRADEUPGRADE

CVE-2021-23771 is a medium-severity flaw (CVSS 6.5) affecting argencoders-notevil, notevil. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

This affects all versions of package notevil; all versions of package argencoders-notevil. It is vulnerable to Sandbox Escape leading to Prototype pollution. The package fails to restrict access to the main context, allowing an attacker to add or modify an object's prototype. **Note:** This vulnerability derives from an incomplete fix in [SNYK-JS-NOTEVIL-608878](https://security.snyk.io/vuln/SNYK-JS-NOTEVIL-608878).

Why this priority

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

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 37%)
CISA exploited list	No
Weakness	CWE-1321
Published	2022-03-17
Last modified	2026-06-17

Publisher (CNA): Snyk · Vendor: argencoders-notevil project · notevil project

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

Am I affected?

Timeline

2022-03-17 12:15 UTCPublished CVE record published
2026-06-17 03:38 UTCUpdated Record last modified

argencoders-notevil project argencoders-notevil UPGRADE

Affected: <= 2.5.0

Fixed in: newer than 2.5.0

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls argencoders-notevil

2. UPGRADE to newer than 2.5.0

npm install argencoders-notevil@">2.5.0"

notevil project notevil UPGRADE

Affected: <= 1.3.3

Fixed in: newer than 1.3.3

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls notevil

2. UPGRADE to newer than 1.3.3

npm install notevil@">1.3.3"

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-2021-23771?

argencoders-notevil: upgrade to newer than 2.5.0; notevil: upgrade to newer than 1.3.3. Exact commands for each OS are on this page.

Is CVE-2021-23771 being exploited?

CVE-2021-23771 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-2021-23771 affect?

CVE-2021-23771 affects argencoders-notevil, notevil. Severity is medium (CVSS 6.5). This affects all versions of package notevil; all versions of package argencoders-notevil. It is vulnerable to Sandbox Escape leading to Prototype pollution. The package fails to restrict access to the main context, allowing an attacker to

How urgent is CVE-2021-23771?

Priority 49/100. Public exploit reference; Remotely exploitable, no login, no user action

References

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