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CVE-2021-23424

25
FAUCET Score

CVE-2021-23424 is a denial-of-service vulnerability affecting all versions of the ansi-html package, where a specially crafted malicious string can cause the software to process input indefinitely. This vulnerability carries a CVSS score of 7.5 (HIGH), indicating it can be exploited remotely with low attack complexity, leading to high availability impact without affecting confidentiality or integrity. Currently, there is 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
< 0.0.8CPE matchmatch criteria
cpe:2.3:a:ansi-html_project:ansi-html:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.98%
Probability of exploitation in next 30 days
EPSS Percentile
78.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0198 is in the 62nd percentile among its peer group of 51,553 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 (4)

npmpatch availablevia ghsa
Product: ansi-htmlFixed in: 0.0.8
redhatvendor investigatingvia redhat_api
Product: Red Hat Advanced Cluster Management for Kubernetes 2Fixed in: rhacm2/console-rhel8
redhatvendor investigatingvia redhat_api
Product: Red Hat Advanced Cluster Management for Kubernetes 2Fixed in: rhacm2/search-ui-rhel8
redhatno patchvia redhat_api
Product: OpenShift Service Mesh 2.0Fixed in: servicemesh-prometheus

Vendor Advisories (2)

npmGHSA-whgm-jr23-g3j9high

Uncontrolled Resource Consumption in ansi-html

Sep 2, 2021
redhatCVE-2021-23424Moderate

nodejs-ansi-html: ReDoS via crafted string

May 7, 2021

References

github.com / Tjatse/ansi-html/issues/19
ExploitIssue TrackingThird Party Advisory
snyk.io / vuln/SNYK-JAVA-ORGWEBJARSNPM-1567198
ExploitThird Party Advisory
snyk.io / vuln/SNYK-JS-ANSIHTML-1296849
ExploitThird Party Advisory