CVE-2021-23364

Name: CVE-2021-23364
Creator: NVD / NIST
Published: 2021-04-28T16:15:08.133+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 2.43%

Last modified Jun 17, 2026

CVE-2021-23364 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. The package browserslist from 4.0.0 and before 4.16.5 are vulnerable to Regular Expression Denial of Service (ReDoS) during parsing of queries.. EPSS estimates a 2.43% chance of exploitation in the next 30 days.

Description

The package browserslist from 4.0.0 and before 4.16.5 are vulnerable to Regular Expression Denial of Service (ReDoS) during parsing of queries.

Metrics

CVSS 3.1

5.3/10

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

EPSS Probability

2.43%

82.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-1333

Affected Software

Vendor	Product	Versions
Browserslist Project	Browserslist	>= 4.0.0, < 4.16.5

References

https://github.com/browserslist/browserslist/blob/e82f32d1d4100d6bc79ea0b6b6a2d281a561e33c/index.js%23L472-L474Broken Link
https://github.com/browserslist/browserslist/commit/c091916910dfe0b5fd61caad96083c6709b02d98Patch, Third Party Advisory
https://github.com/browserslist/browserslist/pull/593Third Party Advisory
https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1277182Exploit, Patch, Third Party Advisory
https://snyk.io/vuln/SNYK-JS-BROWSERSLIST-1090194Exploit, Patch, Third Party Advisory
https://github.com/browserslist/browserslist/blob/e82f32d1d4100d6bc79ea0b6b6a2d281a561e33c/index.js%23L472-L474Broken Link
https://github.com/browserslist/browserslist/commit/c091916910dfe0b5fd61caad96083c6709b02d98Patch, Third Party Advisory
https://github.com/browserslist/browserslist/pull/593Third Party Advisory
https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1277182Exploit, Patch, Third Party Advisory
https://snyk.io/vuln/SNYK-JS-BROWSERSLIST-1090194Exploit, Patch, Third Party Advisory

Timeline

Published: Apr 28, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-23364?

The package browserslist from 4.0.0 and before 4.16.5 are vulnerable to Regular Expression Denial of Service (ReDoS) during parsing of queries.

How severe is CVE-2021-23364?

CVE-2021-23364 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 2.43% probability of exploitation in the next 30 days.

How do I fix CVE-2021-23364?

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-2021-23364?

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

Scan your code now

Source: NVD / NIST