CVE-2021-21384

Name: CVE-2021-21384
Creator: NVD / NIST
Published: 2021-03-19T00:15:11.793+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 0.57%

Last modified Jun 17, 2026

CVE-2021-21384 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. shescape is a simple shell escape package for JavaScript. In shescape before version 1.1.3, anyone using _Shescape_ to defend against shell injection may still be vulnerable against shell injection if the attacker manages to insert a into the payload. EPSS estimates a 0.57% chance of exploitation in the next 30 days.

Description

shescape is a simple shell escape package for JavaScript. In shescape before version 1.1.3, anyone using _Shescape_ to defend against shell injection may still be vulnerable against shell injection if the attacker manages to insert a into the payload. For an example see the referenced GitHub Security Advisory. The problem has been patched in version 1.1.3. No further changes are required.

Metrics

CVSS 3.1

7.8/10

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

EPSS Probability

0.57%

42.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-88

Affected Software

Vendor	Product	Versions
Shescape Project	Shescape	< 1.1.3

References

https://github.com/ericcornelissen/shescape/commit/07a069a66423809cbedd61d980c11ca44a29ea2bPatch, Third Party Advisory
https://github.com/ericcornelissen/shescape/releases/tag/v1.1.3Release Notes, Third Party Advisory
https://github.com/ericcornelissen/shescape/security/advisories/GHSA-f2rp-38vg-j3ghExploit, Third Party Advisory
https://www.npmjs.com/package/shescapeProduct
https://github.com/ericcornelissen/shescape/commit/07a069a66423809cbedd61d980c11ca44a29ea2bPatch, Third Party Advisory
https://github.com/ericcornelissen/shescape/releases/tag/v1.1.3Release Notes, Third Party Advisory
https://github.com/ericcornelissen/shescape/security/advisories/GHSA-f2rp-38vg-j3ghExploit, Third Party Advisory
https://www.npmjs.com/package/shescapeProduct

Timeline

Published: Mar 19, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-21384?

How severe is CVE-2021-21384?

CVE-2021-21384 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.57% probability of exploitation in the next 30 days.

How do I fix CVE-2021-21384?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-21384?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST