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CVE-2021-23364
Regular Expression Denial of Service (ReDoS)
Medium5.3EPSS 2.4%
- Published
- Updated
- Reserved
- Assigned by
- snyk
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.
Timeline
ID reserved
By snyk
- 4 months later
· 4 months later
Published
- 3 years later
· 3 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| snykCNA (assigner) | 3.1 | Medium5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P |
| NVDNVD · Modified | 3.1 | Medium5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
- EPSS (exploitation in 30 days)
- 2.4% · top 16% of all CVEs (7 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.3.
Weakness
- Regular Expression Denial of Service (ReDoS)
- CWE-1333 (opens in a new tab)All about CWE-1333 and its CVEs
Affected products
browserslist
- affected 4.0.0 – < unspecified
- affected unspecified – < 4.16.5
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- npmbrowserslistGHSA-w8qv-6jwh-64r5 (opens in a new tab)
References (5)
- https://snyk.io/vuln/SNYK-JS-BROWSERSLIST-1090194 (opens in a new tab)x_refsource_MISCx_transferred
- https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1277182 (opens in a new tab)x_refsource_MISCx_transferred
- https://github.com/browserslist/browserslist/blob/e82f32d1d4100d6bc79ea0b6b6a2d281a561e33c/index.js%23L472-L474 (opens in a new tab)x_refsource_MISCx_transferred
- https://github.com/browserslist/browserslist/commit/c091916910dfe0b5fd61caad96083c6709b02d98 (opens in a new tab)x_refsource_MISCx_transferred
- https://github.com/browserslist/browserslist/pull/593 (opens in a new tab)x_refsource_MISCx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-w8qv-6jwh-64r5 (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2021-23364)Record last updated .