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CVE-2022-21222

25
FAUCET Score

CVE-2022-21222 is a Regular Expression Denial of Service (ReDoS) vulnerability affecting versions of the css-what package prior to 2.1.3. This flaw stems from an insecure regular expression within the 're_attr' variable in 'index.js', which can be triggered via the 'parse' function. With a CVSS score of 7.5 (HIGH), this vulnerability is remotely exploitable with low attack complexity, potentially leading to a denial of service. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.1.3CPE matchmatch criteria
cpe:2.3:a:css-what_project:css-what:*:*:*:*:*: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
1.46%
Probability of exploitation in next 30 days
EPSS Percentile
70.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0146 is in the 52nd percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (7)

npmpatch availablevia ghsa
Product: css-whatFixed in: 2.1.3
redhatno patchvia redhat_api
Product: OpenShift Service Mesh 2.0Fixed in: servicemesh-grafana
redhatno patchvia redhat_api
Product: Red Hat build of Apicurio Registry 2Fixed in: css-what
redhatend of lifevia redhat_api
Product: OpenShift Service Mesh 2.1Fixed in: servicemesh-grafana
redhatend of lifevia redhat_api
Product: Red Hat Fuse 7Fixed in: css-what
redhatend of lifevia redhat_api
Product: Red Hat Integration Service RegistryFixed in: css-what
redhatend of lifevia redhat_api
Product: Red Hat OpenShift Container Platform 4Fixed in: openshift4/ose-console

Vendor Advisories (2)

npmGHSA-p28h-cc7q-c4fghigh

css-what vulnerable to ReDoS due to use of insecure regular expression

Oct 1, 2022
redhatCVE-2022-21222Moderate

css-what: ReDoS due to insecure regular expression

Sep 30, 2022

References

github.com / fb55/css-what/blob/a38effd5a8f5506d75c7f8f13cbd8c76248a3860/index.js%23L12
Broken LinkThird Party Advisory
lists.debian.org / debian-lts-announce/2023/03/msg00001.html
security.snyk.io / vuln/SNYK-JS-CSSWHAT-3035488
ExploitThird Party Advisory