CVE-2021-4279

Name: CVE-2021-4279
Creator: NVD / NIST
Published: 2022-12-25T20:15:25.61+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.08%

Last modified Jun 17, 2026

CVE-2021-4279 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. A vulnerability has been found in Starcounter-Jack JSON-Patch up to 3.1.0 and classified as problematic. This vulnerability affects unknown code. EPSS estimates a 1.08% chance of exploitation in the next 30 days.

Description

A vulnerability has been found in Starcounter-Jack JSON-Patch up to 3.1.0 and classified as problematic. This vulnerability affects unknown code. The manipulation leads to improperly controlled modification of object prototype attributes ('prototype pollution'). The attack can be initiated remotely. The exploit has been disclosed to the public and may be used. Upgrading to version 3.1.1 is able to address this issue. The name of the patch is 7ad6af41eabb2d799f698740a91284d762c955c9. It is recommended to upgrade the affected component. VDB-216778 is the identifier assigned to this vulnerability.

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

1.08%

60.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-1321

Affected Software

Vendor	Product	Versions
Starcounter-Jack	Json-Patch	< 3.1.1

References

https://github.com/Starcounter-Jack/JSON-Patch/commit/7ad6af41eabb2d799f698740a91284d762c955c9Patch, Third Party Advisory
https://github.com/Starcounter-Jack/JSON-Patch/pull/262Exploit, Patch, Third Party Advisory
https://github.com/Starcounter-Jack/JSON-Patch/releases/tag/3.1.1Release Notes, Third Party Advisory
https://vuldb.com/?ctiid.216778Third Party Advisory
https://vuldb.com/?id.216778Third Party Advisory
https://github.com/Starcounter-Jack/JSON-Patch/commit/7ad6af41eabb2d799f698740a91284d762c955c9Patch, Third Party Advisory
https://github.com/Starcounter-Jack/JSON-Patch/pull/262Exploit, Patch, Third Party Advisory
https://github.com/Starcounter-Jack/JSON-Patch/releases/tag/3.1.1Release Notes, Third Party Advisory
https://vuldb.com/?ctiid.216778Third Party Advisory
https://vuldb.com/?id.216778Third Party Advisory

Timeline

Published: Dec 25, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-4279?

How severe is CVE-2021-4279?

CVE-2021-4279 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.08% probability of exploitation in the next 30 days.

How do I fix CVE-2021-4279?

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-2021-4279?

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

Scan your code now

Source: NVD / NIST