CVE-2021-4056

Name: CVE-2021-4056
Creator: NVD / NIST
Published: 2021-12-23T01:15:08.79+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 1.39%

Last modified Jun 17, 2026

CVE-2021-4056 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Type confusion in loader in Google Chrome prior to 96.0.4664.93 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.. EPSS estimates a 1.39% chance of exploitation in the next 30 days.

Description

Type confusion in loader in Google Chrome prior to 96.0.4664.93 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

1.39%

68.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-843

Affected Software

Vendor	Product	Versions
Google	Chrome	< 96.0.4664.93
Fedoraproject	Fedora	34
Debian	Debian Linux	10.0
Debian	Debian Linux	11.0

References

https://chromereleases.googleblog.com/2021/12/stable-channel-update-for-desktop.htmlVendor Advisory
https://crbug.com/1260939Permissions Required
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3W46HRT2UVHWSLZB6JZHQF6JNQWKV744/
https://security.gentoo.org/glsa/202208-25Third Party Advisory
https://www.debian.org/security/2022/dsa-5046Third Party Advisory
https://chromereleases.googleblog.com/2021/12/stable-channel-update-for-desktop.htmlVendor Advisory
https://crbug.com/1260939Permissions Required
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3W46HRT2UVHWSLZB6JZHQF6JNQWKV744/
https://security.gentoo.org/glsa/202208-25Third Party Advisory
https://www.debian.org/security/2022/dsa-5046Third Party Advisory

Timeline

Published: Dec 23, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-4056?

Type confusion in loader in Google Chrome prior to 96.0.4664.93 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

How severe is CVE-2021-4056?

CVE-2021-4056 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 1.39% probability of exploitation in the next 30 days.

How do I fix CVE-2021-4056?

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-2021-4056?

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

Scan your code now

Source: NVD / NIST