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No exploitation reportedFix available

CVE-2021-23406

No exploitation reported by the sources we read.

  • Published2021-08-24
  • Fixed in3.0.1

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 the package pac-resolver before 5.0.0. This can occur when used with untrusted input, due to unsafe PAC file handling. **NOTE:** The fix for this vulnerability is applied in the node-degenerator library, a dependency written by the same maintainer.

Timeline

dates in UTC
  1. 2021-08-2408:15CVE publishedNVD

Versions per branch

OSV · NVD
degenerator
BranchAffectedFixed in
3.0< 3.0.13.0.1
Pac-resolver project pac-resolver
BranchAffectedFixed in
5.0< 5.0.05.0.0

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/pac-resolverRoot:npmall versions · fixed in 3.0.0-root.io.1
  • pac-resolverTuxCare:npmfrom 4.2.0-tuxcare.0 · fixed in 4.2.0-tuxcare.1
  • pac-resolverRoot:npmall versions · fixed in 3.0.0-aikido.1

Vendor advisories

  • CVE-2021-23406 Red Hat Product Security1 known affected

    nodejs-pac-resolver: remote code execution when used with untrusted input due to unsafe PAC file handling

    rhacm2/application-ui-rhel8 as a component of Red Hat Advanced Cluster Management for Kubernetes 2

Full record on NVD

Fix

  1. Update degenerator to 3.0.1
  2. No fix available, says the vendor Red Hat Product Security CVE-2021-23406 · 1 productFix deferred

Advisories and patches

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:H/I:H/A:H
Published
2021-08-24
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-9j49-mfvp-vmhm

Frequently asked questions

What is CVE-2021-23406?

This affects the package pac-resolver before 5.0.0. This can occur when used with untrusted input, due to unsafe PAC file handling. **NOTE:** The fix for this vulnerability is applied in the node-degenerator library, a dependency written by the same maintainer.

Is CVE-2021-23406 actively exploited?

Active exploitation of CVE-2021-23406 has not been confirmed. Its EPSS score was 2.9% on 2026-11-09, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-23406?

CVE-2021-23406 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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Sources for this record