CVE-2021-30509

Name: CVE-2021-30509
Creator: NVD / NIST
Published: 2021-06-04T18:15:07.817+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 0.84%

Last modified Jun 17, 2026

CVE-2021-30509 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Out of bounds write in Tab Strip in Google Chrome prior to 90.0.4430.212 allowed an attacker who convinced a user to install a malicious extension to perform an out of bounds memory write via a crafted HTML page and a crafted Chrome extension.. EPSS estimates a 0.84% chance of exploitation in the next 30 days.

Description

Out of bounds write in Tab Strip in Google Chrome prior to 90.0.4430.212 allowed an attacker who convinced a user to install a malicious extension to perform an out of bounds memory write via a crafted HTML page and a crafted Chrome extension.

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

0.84%

53.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Google	Chrome	< 90.0.4430.212
Fedoraproject	Fedora	33
Fedoraproject	Fedora	34

References

https://chromereleases.googleblog.com/2021/05/stable-channel-update-for-desktop.htmlRelease Notes, Vendor Advisory
https://crbug.com/1196309Exploit, Issue Tracking, Patch, Permissions Required, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ETMZL6IHCTCTREEL434BQ4THQ7EOHJ43/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PAT6EOXVQFE6JFMFQF4IKAOUQSHMHL54/
https://security.gentoo.org/glsa/202107-06Third Party Advisory
https://chromereleases.googleblog.com/2021/05/stable-channel-update-for-desktop.htmlRelease Notes, Vendor Advisory
https://crbug.com/1196309Exploit, Issue Tracking, Patch, Permissions Required, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ETMZL6IHCTCTREEL434BQ4THQ7EOHJ43/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PAT6EOXVQFE6JFMFQF4IKAOUQSHMHL54/
https://security.gentoo.org/glsa/202107-06Third Party Advisory

Timeline

Published: Jun 4, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-30509?

How severe is CVE-2021-30509?

CVE-2021-30509 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.84% probability of exploitation in the next 30 days.

How do I fix CVE-2021-30509?

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-2021-30509?

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

Scan your code now

Source: NVD / NIST