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CVE-2021-3801

22
FAUCET Score

CVE-2021-3801 describes an Inefficient Regular Expression Complexity vulnerability affecting the prismjs prism library. This medium-severity vulnerability (CVSS 6.5) can be triggered remotely with low attack complexity, requiring user interaction, and could lead 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
< 1.25.0CPE matchmatch criteria
cpe:2.3:a:prismjs:prism:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

CVSS:3.0/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
3.0

Exploit Intelligence

EPSS Score
1.04%
Probability of exploitation in next 30 days
EPSS Percentile
60.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0104 is in the 73rd percentile among its peer group of 26,219 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 (7)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: prismjsFixed in: 1.25.0
redhatpatch availablevia redhat_api
Product: RHACS-3.67-RHEL-8Fixed in: advanced-cluster-security/rhacs-rhel8-operator:3.67.0-3
View patch
redhatvendor investigatingvia redhat_api
Product: Migration Toolkit for VirtualizationFixed in: migration-toolkit-virtualization/mtv-ui-rhel8
redhatno patchvia redhat_api
Product: OpenShift Service Mesh 2.0Fixed in: servicemesh-grafana
redhatend of lifevia redhat_api
Product: Red Hat OpenShift Container Platform 4Fixed in: openshift4/ose-grafana
redhatend of lifevia redhat_api
Product: Red Hat Storage 3Fixed in: grafana

Vendor Advisories (2)

npmGHSA-hqhp-5p83-hx96medium

prismjs Regular Expression Denial of Service vulnerability

Sep 20, 2021
redhatCVE-2021-3801Moderate

nodejs-prismjs: ReDoS vulnerability

Sep 11, 2021

References

github.com / prismjs/prism/commit/0ff371bb4775a131634f47d0fe85794c547232f9
PatchThird Party Advisory
huntr.dev / bounties/8c16ab31-6eb6-46d1-b9a4-387222fe1b8a
ExploitIssue TrackingPatchThird Party Advisory