VulnerabilityModified

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.

MEDIUM 5.3EPSS 2.38%

Does this matter?

Lower severity and a low EPSS score (2.38%). Track it; it rarely justifies an emergency change on its own.

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.

CVSS 3.1: 5.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
EPSS: 2.38% probability · 84th percentile
Public exploits: None in Exploit-DB
CISA KEV: Not listed
Weakness: CWE-1333
Affected: browserslist project/browserslist
Source: report@snyk.io

EPSS trend

EPSS 2.4% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.

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

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.