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 ex…

published 2021-06-04 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-17430

cvss: 8.8; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.8%; EPSS 0.8% chance of exploitation in 30 days, percentile 57%
public exploits: 0; none known

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.

Patch / fix

fixed in 1 distros 4 links 1

Google Chrome 90.0.4430.212

debian ubuntu opensuse arch linux

chromium Debian 14, Debian 13, Debian 12 90.0.4430.212-1

debian advisories DEBIAN-CVE-2021-30509

chromium-browser Ubuntu 18.04 LTS 91.0.4472.77-0ubuntu0.18.04.1

ubuntu advisories UBUNTU-CVE-2021-30509

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

chromium openSUSE Tumbleweed 93.0.4577.82-1.1
chromium openSUSE Tumbleweed 113.0.5672.92-1.1
opera openSUSE Leap 15.4 NonFree 85.0.4341.28-lp154.2.5.1
opera openSUSE Leap 15.2 NonFree 76.0.4017.154-lp152.2.49.1
opera openSUSE Leap 15.3 NonFree 76.0.4017.154-lp153.2.3.1
chromium openSUSE Leap 15.2 90.0.4430.212-lp152.2.95.1
chromium openSUSE Leap 15.2 90.0.4430.212-lp152.2.92.1

opensuse advisories openSUSE-SU-2024:10681-1 openSUSE-SU-2024:12948-1 openSUSE-SU-2022:0110-1 openSUSE-SU-2021:0829-1 openSUSE-SU-2021:0828-1 openSUSE-SU-2021:0762-1

chromium Arch Linux 90.0.4430.212-1
vivaldi Arch Linux 3.8.2259.42-1

arch linux advisories AVG-1936 AVG-1937

crbug.com/1196309 advisory

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-30509 updated 2025-11-21 cvss 8.8

chromium-browser: Out of bounds write in Tab Strip

Red Hat All currently supported Red Hat products
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.82% chance of exploitation in the next 30 days, higher than 57% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

crbug.com https://crbug.com/1196309 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD	2.0	6.8	AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected products

Google Chrome

Classification

Weakness

CWE-787 Out-of-bounds Write

Technology feeds

Google Chrome rss critical rss

References

crbug.com /1196309
exploit, issue-tracking, patch, permissions-required, vendor-advisory
security.gentoo.org /glsa/202107-06
vendor-advisory, third-party-advisory
lists.fedoraproject.org /archives/list/package-announce%40lists.fedoraproject.org/message/PAT6EOXVQFE6JFMFQF4IKAOUQSHMHL54/
vendor-advisory
lists.fedoraproject.org /archives/list/package-announce%40lists.fedoraproject.org/message/ETMZL6IHCTCTREEL434BQ4THQ7EOHJ43/
vendor-advisory
chromereleases.googleblog.com /2021/05/stable-channel-update-for-desktop.html
release-notes, vendor-advisory

Sources

CVE List CVE-2021-30509
NVD CVE-2021-30509

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary