CVE-2021-23509

Name: CVE-2021-23509
Creator: NVD / NIST
Published: 2021-11-03T18:15:08.073+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.77%

Last modified Jun 17, 2026

CVE-2021-23509 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. This affects the package json-ptr before 3.0.0. A type confusion vulnerability can lead to a bypass of CVE-2020-7766 when the user-provided keys used in the pointer parameter are arrays.. EPSS estimates a 1.77% chance of exploitation in the next 30 days.

Description

This affects the package json-ptr before 3.0.0. A type confusion vulnerability can lead to a bypass of CVE-2020-7766 when the user-provided keys used in the pointer parameter 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

1.77%

75.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-843

Affected Software

Vendor	Product	Versions
Json-Ptr Project	Json-Ptr	< 3.0.0

References

https://github.com/flitbit/json-ptr%23security-vulnerabilities-resolvedBroken Link, Third Party Advisory
https://github.com/flitbit/json-ptr/commit/5dc458fbad1c382a2e3ca6d62e66ede3d92849caPatch, Third Party Advisory
https://github.com/flitbit/json-ptr/pull/42Patch, Third Party Advisory
https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1767165Exploit, Mitigation, Patch, Third Party Advisory, VDB Entry
https://snyk.io/vuln/SNYK-JS-JSONPTR-1577291Exploit, Mitigation, Patch, Third Party Advisory, VDB Entry
https://github.com/flitbit/json-ptr%23security-vulnerabilities-resolvedBroken Link, Third Party Advisory
https://github.com/flitbit/json-ptr/commit/5dc458fbad1c382a2e3ca6d62e66ede3d92849caPatch, Third Party Advisory
https://github.com/flitbit/json-ptr/pull/42Patch, Third Party Advisory
https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1767165Exploit, Mitigation, Patch, Third Party Advisory, VDB Entry
https://snyk.io/vuln/SNYK-JS-JSONPTR-1577291Exploit, 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-2021-23509?

This affects the package json-ptr before 3.0.0. A type confusion vulnerability can lead to a bypass of CVE-2020-7766 when the user-provided keys used in the pointer parameter are arrays.

How severe is CVE-2021-23509?

CVE-2021-23509 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.77% probability of exploitation in the next 30 days.

How do I fix CVE-2021-23509?

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-2021-23509?

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

Scan your code now

Source: NVD / NIST