CVE-2021-23807

Name: CVE-2021-23807
Creator: NVD / NIST
Published: 2021-11-03T18:15:08.23+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 2.61%

Last modified Jun 17, 2026

CVE-2021-23807 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. This affects the package jsonpointer before 5.0.0. A type confusion vulnerability can lead to a bypass of a previous Prototype Pollution fix when the pointer components are arrays.. EPSS estimates a 2.61% chance of exploitation in the next 30 days.

Description

This affects the package jsonpointer before 5.0.0. A type confusion vulnerability can lead to a bypass of a previous Prototype Pollution fix when the pointer components are arrays.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

2.61%

83.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-843

Affected Software

Vendor	Product	Versions
Janl	Jsonpointer	< 5.0.0

References

https://github.com/janl/node-jsonpointer/commit/a0345f3550cd9c4d89f33b126390202b89510ad4Patch, Third Party Advisory
https://github.com/janl/node-jsonpointer/pull/51Patch, Third Party Advisory
https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1910273Exploit, Mitigation, Patch, Third Party Advisory, VDB Entry
https://snyk.io/vuln/SNYK-JS-JSONPOINTER-1577288Exploit, Mitigation, Patch, Third Party Advisory, VDB Entry
https://github.com/janl/node-jsonpointer/commit/a0345f3550cd9c4d89f33b126390202b89510ad4Patch, Third Party Advisory
https://github.com/janl/node-jsonpointer/pull/51Patch, Third Party Advisory
https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1910273Exploit, Mitigation, Patch, Third Party Advisory, VDB Entry
https://snyk.io/vuln/SNYK-JS-JSONPOINTER-1577288Exploit, Mitigation, Patch, Third Party Advisory, VDB Entry

Timeline

Published: Nov 3, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-23807?

This affects the package jsonpointer before 5.0.0. A type confusion vulnerability can lead to a bypass of a previous Prototype Pollution fix when the pointer components are arrays.

How severe is CVE-2021-23807?

CVE-2021-23807 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.61% probability of exploitation in the next 30 days.

How do I fix CVE-2021-23807?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-23807?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST