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CVE-2021-32723

22
FAUCET Score

CVE-2021-32723 is a Regular Expression Denial of Service (ReDoS) vulnerability affecting Prism syntax highlighting library versions prior to 1.24.0, specifically when used with ASCIIDoc or ERB languages. An attacker can craft malicious input to cause a prolonged highlighting process, leading to a denial of service. With a CVSS score of 6.5 (Medium), this vulnerability requires user interaction (UI:R) but has a high impact on availability (A:H). There is no evidence of active exploitation, publicly available exploit code, or significant community discussion or media coverage for this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.24.0CPE matchmatch criteria
cpe:2.3:a:prismjs:prism:*:*:*:*:*:node.js:*:*
< 21.1.4CPE matchmatch criteria
cpe:2.3:a:oracle:application_express:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.4HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
4.0
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.43%
Probability of exploitation in next 30 days
EPSS Percentile
70.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0143 is in the 83rd percentile among its peer group of 26,234 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 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 (6)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: prismjsFixed in: 1.24.0
oraclepatch availablevia nvd_reference
View patch
redhatvendor investigatingvia redhat_api
Product: Red Hat OpenShift Container Platform 4Fixed in: openshift4/ose-grafana
redhatno patchvia redhat_api
Product: OpenShift Service Mesh 2.0Fixed in: servicemesh-grafana
redhatno patchvia redhat_api
Product: Red Hat Advanced Cluster Security 3Fixed in: rox

Vendor Advisories (2)

npmGHSA-gj77-59wh-66hghigh

Regular Expression Denial of Service (ReDoS) in Prism

Jun 28, 2021
redhatCVE-2021-32723Moderate

npm-prismjs: a malicious (long) string will take a long time to highlight may result in ReDoS

Jun 28, 2021

References

github.com / PrismJS/prism/pull/2688
PatchThird Party Advisory
github.com / PrismJS/prism/pull/2774
PatchThird Party Advisory
github.com / PrismJS/prism/security/advisories/GHSA-gj77-59wh-66hg
Third Party Advisory
oracle.com / security-alerts/cpujan2022.html
PatchThird Party Advisory