CVE-2021-23364

FAUCET Score

CVE-2021-23364 describes a Regular Expression Denial of Service (ReDoS) vulnerability in the browserslist package, affecting versions 4.0.0 through 4.16.5. This medium-severity vulnerability (CVSS 5.3) can be triggered remotely with low attack complexity, potentially leading to a denial of service. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

Vendor	Product	Version(s)	CPE
		>= 4.0.0, < 4.16.5CPE matchmatch criteria	cpe:2.3:a:browserslist_project:browserslist::::::node.js::*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

LOW

Exploitability Score

3.9

Impact Score

1.4

CvssVersion

3.1

Exploit Intelligence

EPSS Score

2.43%

Probability of exploitation in next 30 days

EPSS Percentile

82.5%

Percentile rank of EPSS score among Peer Group

As of 2026-07-27

Model: v2026.06.15

This CVE's current EPSS score of 0.0243 is in the 74th percentile among its peer group of 23,705 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

Patch Available

Vendor Patches (17)

github_advisorypatch availablevia nvd_reference

View patch

npmpatch availablevia ghsa

Product: browserslistFixed in: 4.16.5

redhatpatch availablevia redhat_api

Product: Red Hat Quay 3Fixed in: quay/quay-rhel8:v3.6.0-62

View patch

redhatvendor investigatingvia redhat_api

Product: Red Hat OpenShift Container Platform 4Fixed in: openshift4/ose-thanos-rhel8

redhatvendor investigatingvia redhat_api

Product: Red Hat OpenShift Container Platform 4Fixed in: openshift4/ose-grafana

redhatvendor investigatingvia redhat_api

Product: Red Hat OpenShift Container Platform 4Fixed in: openshift4/ose-prometheus-rhel9

redhatno patchvia redhat_api

Product: OpenShift Service Mesh 2.0Fixed in: servicemesh-grafana

redhatno patchvia redhat_api

Product: OpenShift Service Mesh 2.0Fixed in: servicemesh-prometheus

redhatno patchvia redhat_api

Product: Red Hat Advanced Cluster Management for Kubernetes 2Fixed in: rhacm2/search-api-rhel8