MEDIUM

CVE-2021-23368

CVSS v3

5.3

MEDIUM

EPSS Score

3.5 %

exploit probability, as of 2026-10-17

CISA KEV

known exploited

Exploitation

—

SSVC status

Get an alert for each new CVE published for postcss. Watch postcss in CVE Watch Free account · no credit card

Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

postcssnpmfrom 8.0.0 · fixed in 8.2.10

Vendor advisories

CVE-2021-23368 Red Hat Product Security4 products fixed · 20 known affected
nodejs-postcss: Regular expression denial of service during source map parsing
openshift-logging/kibana6-rhel8 as a component of Logging Subsystem for Red Hat OpenShift · servicemesh-grafana as a component of OpenShift Service Mesh 2.0 · servicemesh-grafana-prometheus as a component of OpenShift Service Mesh 2.0
RHSA-2021:3917 Red Hat Product Security1 product fixed
Red Hat Security Advisory: Red Hat Quay v3.6.0 security, bug fix and enhancement update
RHSA-2021:2438 Red Hat Product Security3 products fixed
Red Hat Security Advisory: OpenShift Container Platform 4.8.2 bug fix and security update

Full record on NVD

Description

The package postcss from 7.0.0 and before 8.2.10 are vulnerable to Regular Expression Denial of Service (ReDoS) during source map parsing.

Technical details

Published: 2021-04-12

Frequently asked questions

What is CVE-2021-23368?

The package postcss from 7.0.0 and before 8.2.10 are vulnerable to Regular Expression Denial of Service (ReDoS) during source map parsing.

Is CVE-2021-23368 actively exploited?

Active exploitation of CVE-2021-23368 has not been confirmed. Its EPSS score was 3.5% on 2026-10-17, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-23368?

CVE-2021-23368 has a CVSS v3 base score of 5.3 (MEDIUM severity).

Running postcss? Hear about its next vulnerability

CVE Watch matches each new CVE to the vendors and products you list (vendor and product, not the version) and puts it in your alerts with its KEV and EPSS status.

Get alerts for this product CISA KEV additions, October 2026 Search CVEs

Already have an account? Open CVE WatchNo credit card required · 50 free checks/month · Free API key

Go further

Following what attackers exploit right now? The CISA KEV additions of the month, with their patch deadlines.
Running this software? CVE Watch alerts you to new vulnerabilities in your products.

Related vulnerabilities

Same product first, then the same vendor advisory and the same publication week.

Back to CVE Database