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Fencer Vulns
high 7.5

CVE-2021-3801 json

Inefficient Regular Expression Complexity in prismjs/prism

published 2021-09-15 5 y ago modified 2026-06-17 4 mo ago also GHSA-hqhp-5p83-hx96 , EUVD-2021-2075

cvss
7.5
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.0%
EPSS 1.0% chance of exploitation in 30 days, percentile 64%
public exploits
0
none known

Summary

prism is vulnerable to Inefficient Regular Expression Complexity

Patch / fix

  • npm prismjs 1.25.0
  • prismjs prism 1.25.0
  • node-prismjs Debian 14, Debian 13, Debian 12 1.25.0+dfsg-1

debian advisories DEBIAN-CVE-2021-3801

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-3801 updated cvss 6.5

nodejs-prismjs: ReDoS vulnerability

  • Red Hat Migration Toolkit for Virtualization migration-toolkit-virtualization/mtv-ui-rhel8
    affected: no fix available “Fix deferred”
  • Red Hat OpenShift Service Mesh 2.0 servicemesh-grafana, servicemesh-grafana-prometheus
    affected: no fix available
  • Red Hat Ceph Storage 3 grafana
    affected: no fix planned “Out of support scope”
  • Red Hat OpenShift Container Platform 4 openshift4/ose-grafana Red Hat Storage 3 grafana
    affected: no fix planned “Will not fix”
  • Red Hat RHACS 3.67 for RHEL 8 advanced-cluster-security/rhacs-rhel8-operator 3.67.0-3
    fixed: vendor fix RHSA-2021:4902
  • Red Hat Ceph Storage 4 rhceph/rhceph-4-dashboard-rhel8 Red Hat RHACS 3.67 for RHEL 8 advanced-cluster-security/rhacs-operator-bundle 3.67.0-2
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.04% chance of exploitation in the next 30 days, higher than 64% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • huntr.dev https://huntr.dev/bounties/8c16ab31-6eb6-46d1-b9a4-387222fe1b8a referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P
GitHub 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
npm prismjs
<1.25.0
1.25.0

Affected products

  • prismjs prismjs/prism

Classification

Weakness
  • CWE-1333 Inefficient Regular Expression Complexity
  • CWE-400 Uncontrolled Resource Consumption

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.