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CVE-2021-23368

19
FAUCET Score

CVE-2021-23368 is a Regular Expression Denial of Service (ReDoS) vulnerability affecting postcss versions 7.0.0 through 8.2.9 during source map parsing. It has a CVSS score of 5.3 (Medium), indicating a low-impact denial of service attack that can be launched remotely without user interaction or privileges. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
>= 7.0.0, < 7.0.36CPE matchmatch criteria
cpe:2.3:a:postcss:postcss:*:*:*:*:*:node.js:*:*
>= 8.0.0, < 8.2.10CPE matchmatch criteria
cpe:2.3:a:postcss:postcss:*:*:*:*:*: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
3.54%
Probability of exploitation in next 30 days
EPSS Percentile
88.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0354 is in the 84th 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 (20)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: postcssFixed in: 7.0.36
npmpatch availablevia ghsa
Product: postcssFixed in: 8.2.10
redhatpatch availablevia redhat_api
Product: Red Hat Quay 3Fixed in: quay/quay-rhel8:v3.6.0-62
View patch
redhatpatch availablevia redhat_api
Product: Red Hat OpenShift Container Platform 4.8Fixed in: openshift4/ose-console:v4.8.0-202107010336.p0.git.188a490.assembly.stream
View patch
redhatvendor investigatingvia redhat_api
Product: Red Hat Advanced Cluster Management for Kubernetes 2Fixed in: console
redhatvendor investigatingvia redhat_api
Product: Red Hat Advanced Cluster Management for Kubernetes 2Fixed in: search-ui
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: golang-github-prometheus-prometheus
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-logging-kibana6
redhatvendor investigatingvia redhat_api
Product: Logging Subsystem for Red Hat OpenShiftFixed in: openshift-logging/kibana6-rhel8
redhatvendor investigatingvia redhat_api
Product: Red Hat Advanced Cluster Management for Kubernetes 2Fixed in: application-ui
redhatno patchvia redhat_api
Product: Red Hat Advanced Cluster Management for Kubernetes 2Fixed in: grc-ui
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
redhatend of lifevia redhat_api
Product: Red Hat OpenShift Container Platform 4Fixed in: kibana
redhatend of lifevia redhat_api
Product: Red Hat Virtualization 4Fixed in: cockpit-ovirt
redhatend of lifevia redhat_api
Product: Red Hat Virtualization 4Fixed in: ovirt-engine-ui-extensions
redhatend of lifevia redhat_api
Product: Red Hat Virtualization 4Fixed in: ovirt-web-ui

Vendor Advisories (2)

npmGHSA-hwj9-h5mp-3pm3medium

Regular Expression Denial of Service in postcss

May 10, 2021
redhatCVE-2021-23368Moderate

nodejs-postcss: Regular expression denial of service during source map parsing

Apr 12, 2021

References

github.com / postcss/postcss/commit/8682b1e4e328432ba692bed52326e84439cec9e4
PatchThird Party Advisory
github.com / postcss/postcss/commit/b6f3e4d5a8d7504d553267f80384373af3a3dec5
PatchThird Party Advisory
lists.apache.org / thread.html/r00158f5d770d75d0655c5eef1bdbc6150531606c8f8bcb778f0627be%40%3Cdev.myfaces.apache.org%3E
lists.apache.org / thread.html/r16e295b4f02d81b79981237d602cb0b9e59709bafaa73ac98be7cef1%40%3Cdev.myfaces.apache.org%3E
lists.apache.org / thread.html/r49afb49b38748897211b1f89c3a64dc27f9049474322b05715695aab%40%3Cdev.myfaces.apache.org%3E
lists.apache.org / thread.html/r5acd89f3827ad9a9cad6d24ed93e377f7114867cd98cfba616c6e013%40%3Ccommits.myfaces.apache.org%3E
lists.apache.org / thread.html/r8def971a66cf3e375178fbee752e1b04a812a047cc478ad292007e33%40%3Cdev.myfaces.apache.org%3E
lists.apache.org / thread.html/rad5af2044afb51668b1008b389ac815a28ecea9eb75ae2cab5a00ebb%40%3Ccommits.myfaces.apache.org%3E
snyk.io / vuln/SNYK-JAVA-ORGWEBJARSNPM-1244795
ExploitPatchThird Party Advisory
snyk.io / vuln/SNYK-JS-POSTCSS-1090595
ExploitPatchThird Party Advisory