CVE-2021-21110

Name: CVE-2021-21110
Creator: NVD / NIST
Published: 2021-01-08T19:15:15.1+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.6/10EPSS 3.09%

Last modified Jun 17, 2026

CVE-2021-21110 is a critical-severity vulnerability rated 9.6/10 on the CVSS scale. Use after free in safe browsing in Google Chrome prior to 87.0.4280.141 allowed a remote attacker to potentially perform a sandbox escape via a crafted HTML page.. EPSS estimates a 3.09% chance of exploitation in the next 30 days.

Description

Use after free in safe browsing in Google Chrome prior to 87.0.4280.141 allowed a remote attacker to potentially perform a sandbox escape via a crafted HTML page.

Metrics

CVSS 3.1

9.6/10

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

EPSS Probability

3.09%

86.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-416

Affected Software

Vendor	Product	Versions
Google	Chrome	< 87.0.4280.141
Fedoraproject	Fedora	32
Fedoraproject	Fedora	33
Debian	Debian Linux	10.0

References

https://chromereleases.googleblog.com/2021/01/stable-channel-update-for-desktop.htmlRelease Notes, Vendor Advisory
https://crbug.com/1152451Permissions Required, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VVUWIJKZTZTG6G475OR6PP4WPQBVM6PS/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z6P6AVVFP7B2M4H7TJQBASRZIBLOTUFN/
https://security.gentoo.org/glsa/202101-05Third Party Advisory
https://www.debian.org/security/2021/dsa-4832Third Party Advisory
https://chromereleases.googleblog.com/2021/01/stable-channel-update-for-desktop.htmlRelease Notes, Vendor Advisory
https://crbug.com/1152451Permissions Required, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VVUWIJKZTZTG6G475OR6PP4WPQBVM6PS/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z6P6AVVFP7B2M4H7TJQBASRZIBLOTUFN/
https://security.gentoo.org/glsa/202101-05Third Party Advisory
https://www.debian.org/security/2021/dsa-4832Third Party Advisory

Timeline

Published: Jan 8, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-21110?

Use after free in safe browsing in Google Chrome prior to 87.0.4280.141 allowed a remote attacker to potentially perform a sandbox escape via a crafted HTML page.

How severe is CVE-2021-21110?

CVE-2021-21110 has a CVSS score of 9.6/10 (CRITICAL severity). The EPSS model estimates a 3.09% probability of exploitation in the next 30 days.

How do I fix CVE-2021-21110?

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-2021-21110?

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

Scan your code now

Source: NVD / NIST