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Fencer Vulns
medium 5.6

CVE-2021-23820 json

Prototype Pollution

published 2021-11-03 5 y ago modified 2026-09-10 1 mo ago also GHSA-v5vg-g7rq-363w , EUVD-2021-2394

cvss
5.6
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.9%
EPSS 1.9% chance of exploitation in 30 days, percentile 79%
public exploits
0
none known

Summary

This affects all versions of package json-pointer. A type confusion vulnerability can lead to a bypass of CVE-2020-7709 when the pointer components are arrays.

Patch / fix

  • npm json-pointer 0.6.2
  • manuelstofer json-pointer 0.6.2

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-2021-23820 updated cvss 5.6

json-pointer: type confusion vulnerability can lead to a bypass of CVE-2020-7709 when the pointer components are arrays

  • Red Hat RHACS 3.70 for RHEL 8 advanced-cluster-security/rhacs-docs-rhel8 3.70.0-2, advanced-cluster-security/rhacs-main-rhel8 3.70.0-9, advanced-cluster-security/rhacs-roxctl-rhel8 3.70.0-2, advanced-cluster-security/rhacs-rhel8-operator 3.70.0-2, advanced-cluster-security/rhacs-collector-slim-rhel8 3.70.0-2
    fixed: vendor fix RHSA-2022:4880
  • Red Hat RHACS 3.70 for RHEL 8 advanced-cluster-security/rhacs-scanner-rhel8 3.70.0-2, advanced-cluster-security/rhacs-collector-rhel8 3.70.0-2, advanced-cluster-security/rhacs-operator-bundle 3.70.0-4, advanced-cluster-security/rhacs-scanner-db-rhel8 3.70.0-2, advanced-cluster-security/rhacs-scanner-slim-rhel8 3.70.0-2, advanced-cluster-security/rhacs-scanner-db-slim-rhel8 3.70.0-2
    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

1.87% chance of exploitation in the next 30 days, higher than 79% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • snyk.io https://snyk.io/vuln/SNYK-JS-JSONPOINTER-1577287 referenced PoC, tagged "exploit" by a source, unverified
  • snyk.io https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1910686 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 5.6 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P
GitHub 3.1 5.6 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

Affected packages

ecosystem package affected fixed in
npm json-pointer
<0.6.2
0.6.2

Affected products

  • n/a json-pointer

Classification

Weakness
  • CWE-843 Access of Resource Using Incompatible Type
  • CWE-1321 Improperly Controlled Modification of Object Prototype Attributes

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.