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CVE-2021-23771

23
FAUCET Score

CVE-2021-23771 is a Sandbox Escape vulnerability affecting all versions of the 'notevil' and 'argencoders-notevil' packages, stemming from an incomplete prior fix. It allows an attacker to achieve prototype pollution by modifying object prototypes due to insufficient restriction of access to the main context. With a CVSS score of 6.5 (Medium), this vulnerability can be exploited remotely with low attack complexity, potentially leading to low impact on confidentiality and integrity. There is currently no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 2.5.0CPE matchmatch criteria
cpe:2.3:a:argencoders-notevil_project:argencoders-notevil:*:*:*:*:*:node.js:*:*
<= 1.3.3CPE matchmatch criteria
cpe:2.3:a:notevil_project:notevil:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
2.5
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.00%
Probability of exploitation in next 30 days
EPSS Percentile
59.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0100 is in the 37th percentile among its peer group of 23,725 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

npmGHSA-8g4m-cjm2-96wqmedium

Sandbox escape in notevil and argencoders-notevil

Mar 18, 2022

References

snyk.io / vuln/SNYK-JS-ARGENCODERSNOTEVIL-2388587
ExploitThird Party Advisory
snyk.io / vuln/SNYK-JS-NOTEVIL-2385946
ExploitThird Party Advisory