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No exploitation reportedFix available

CVE-2021-23424

No exploitation reported by the sources we read.

  • Published2021-08-18
  • Fixed in0.0.8

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

This affects all versions of package ansi-html. If an attacker provides a malicious string, it will get stuck processing the input for an extremely long time.

Timeline

dates in UTC
  1. 2021-08-1817:15CVE publishedNVD

Versions per branch

NVD · OSV
Ansi-html project ansi-html
BranchAffectedFixed in
0.0< 0.0.80.0.8

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

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

  • @rootio/ansi-htmlRoot:npmall versions · fixed in 0.0.7-root.io.1
  • ansi-htmlRoot:npmall versions · fixed in 0.0.7-aikido.1

Vendor advisories

  • CVE-2021-23424 Red Hat Product Security6 known affected

    nodejs-ansi-html: ReDoS via crafted string

    servicemesh-prometheus as a component of OpenShift Service Mesh 1 · servicemesh-prometheus.src as a component of OpenShift Service Mesh 1 · servicemesh-prometheus as a component of OpenShift Service Mesh 2.0 · +3 more

Full record on NVD

Fix

  1. Update Ansi-html project ansi-html to 0.0.8
  2. No fix available, says the vendor Red Hat Product Security CVE-2021-23424 · 2 productsFix deferred
  3. No fix available, says the vendor Red Hat Product Security CVE-2021-23424 · 2 productsAffected
  4. No fix planned, says the vendor Red Hat Product Security CVE-2021-23424 · 2 productsOut of support scope

Detection

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

Sources

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
2021-08-18
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-whgm-jr23-g3j9

Frequently asked questions

What is CVE-2021-23424?

This affects all versions of package ansi-html. If an attacker provides a malicious string, it will get stuck processing the input for an extremely long time.

Is CVE-2021-23424 actively exploited?

Active exploitation of CVE-2021-23424 has not been confirmed. Its EPSS score was 1.8% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-23424?

CVE-2021-23424 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