CVE-2021-21157

Name: CVE-2021-21157
Creator: NVD / NIST
Published: 2021-02-22T22:15:12.927+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 9.46%

Last modified Jun 17, 2026

CVE-2021-21157 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Use after free in Web Sockets in Google Chrome on Linux prior to 88.0.4324.182 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.. EPSS estimates a 9.46% chance of exploitation in the next 30 days.

Description

Use after free in Web Sockets in Google Chrome on Linux prior to 88.0.4324.182 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

9.46%

94.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-416

Affected Software

Vendor	Product	Versions
Microsoft	Edge	< 88.0.705.74
Microsoft	Edge Chromium	< 88.0.4324.182
Fedoraproject	Fedora	32
Fedoraproject	Fedora	33
Google	Chrome	< 88.0.4324.182

References

https://chromereleases.googleblog.com/2021/02/stable-channel-update-for-desktop_16.htmlRelease Notes, Vendor Advisory
https://crbug.com/1170657Exploit, Issue Tracking, Patch, Permissions Required, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BI6ZIJQYP5DFMYVX4J5OGOU2NQLEZ3SB/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FE5SIKEVYTMDCC5OSXGOM2KRPYLHYMQX/
https://security.gentoo.org/glsa/202104-08Third Party Advisory
https://chromereleases.googleblog.com/2021/02/stable-channel-update-for-desktop_16.htmlRelease Notes, Vendor Advisory
https://crbug.com/1170657Exploit, Issue Tracking, Patch, Permissions Required, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BI6ZIJQYP5DFMYVX4J5OGOU2NQLEZ3SB/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FE5SIKEVYTMDCC5OSXGOM2KRPYLHYMQX/
https://security.gentoo.org/glsa/202104-08Third Party Advisory

Timeline

Published: Feb 22, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-21157?

Use after free in Web Sockets in Google Chrome on Linux prior to 88.0.4324.182 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

How severe is CVE-2021-21157?

CVE-2021-21157 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 9.46% probability of exploitation in the next 30 days.

How do I fix CVE-2021-21157?

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-2021-21157?

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

Scan your code now

Source: NVD / NIST