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Public proof of conceptFix available

CVE-2022-21222

A public proof of concept exists; no exploitation attested.

  • Published2022-09-30
  • Fixed in2.1.3
  • WeaknessCWE-1333

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

The package css-what before 2.1.3 are vulnerable to Regular Expression Denial of Service (ReDoS) due to the usage of insecure regular expression in the re_attr variable of index.js. The exploitation of this vulnerability could be triggered via the parse function.

Timeline

dates in UTC
  1. 2022-09-3005:15CVE publishedNVD

Versions per branch

NVD · OSV
Css-what project css-what
BranchAffectedFixed in
2.1< 2.1.32.1.3

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As snyk, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • css-what
    Affected
    • < 2.1.3fixed in 2.1.3custom

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2023-03-03

Distribution builds and vendor advisories

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

  • node-css-whatUbuntu:Pro:20.04:LTSall versions · fixed in 3.2.1-1ubuntu0.1~esm1
  • node-css-whatUbuntu:Pro:16.04:LTSall versions · fixed in 2.1.0-1ubuntu0.16.04.1~esm1
  • node-css-whatUbuntu:26.10all versions · no fixed version listed
  • node-css-whatUbuntu:26.04:LTSall versions · no fixed version listed
  • node-css-whatUbuntu:25.10all versions · no fixed version listed
  • node-css-whatUbuntu:24.04:LTSall versions · no fixed version listed
  • node-css-whatUbuntu:18.04:LTSall versions · fixed in 2.1.0-1+deb10u1build0.18.04.1
  • node-css-whatDebian:14all versions · fixed in 5.0.1-1

3 more package ranges on OSV.dev

Vendor advisories

  • CVE-2022-21222 Red Hat Product Security14 known affected

    css-what: ReDoS due to insecure regular expression

    servicemesh-grafana as a component of OpenShift Service Mesh 2.0 · servicemesh-grafana-prometheus as a component of OpenShift Service Mesh 2.0 · servicemesh-grafana.src as a component of OpenShift Service Mesh 2.0 · +11 more

Full record on NVD

Fix

  1. Update Css-what project css-what to 2.1.3
  2. No fix available, says the vendor Red Hat Product Security CVE-2022-21222 · 4 productsAffected
  3. No fix planned, says the vendor Red Hat Product Security CVE-2022-21222 · 5 productsOut of support scope
  4. No fix planned, says the vendor Red Hat Product Security CVE-2022-21222 · 5 productsWill not fix

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • CISA-ADPSSVC decisionpoc2025-05-20
  • CNACVSS 3.15.3known since 2026-10-23
  • NVDCVSS 3.17.5read 2026-10-23
  • CISA-ADPweakness (CWE)CWE-13332025-05-20
  • NVDweakness (CWE)CWE-1333read 2026-10-23
  • FIRST EPSSEPSS score1.9 %2026-11-08
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryHIGH2022-10-04

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2022-09-30
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-p28h-cc7q-c4fg

Frequently asked questions

What is CVE-2022-21222?

The package css-what before 2.1.3 are vulnerable to Regular Expression Denial of Service (ReDoS) due to the usage of insecure regular expression in the re_attr variable of index.js. The exploitation of this vulnerability could be triggered via the parse function.

Is CVE-2022-21222 actively exploited?

A proof-of-concept exploit exists for CVE-2022-21222, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2022-21222?

CVE-2022-21222 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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Sources for this record