CVE-2021-30563
HighExploitedPublic exploitType Confusion in V8 in Google Chrome prior to 91.0.4472.164 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.
Published Dec 15, 2021 · Updated Aug 4, 2026 · Also known as DEBIAN-CVE-2021-30563, UBUNTU-CVE-2021-30563
Key Facts
Patch immediately- CVE-2021-30563 is a high-severity vulnerability (CVSS 8.8 v3.1) affecting Chrome (Google), chromium (arch), opera (arch) and 16 more products.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jul 12, 2021. Public exploit code is available.
- EPSS estimates a 9.0% probability of exploitation in the next 30 days.
- Fixed versions are available, including Chrome 91.0.4472.164, chromedriver 91.0.4472.164-bp153.2.16.1, chromedriver 91.0.4472.164-lp152.2.113.2.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
8.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
9.0%
Higher than 95.2% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2021-30563 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
Type Confusion in V8 in Google Chrome prior to 91.0.4472.164 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Nov 3, 2021 | Nov 17, 2021 | Not reported |
| Industry KEV feed | Jul 12, 2021 | Nov 17, 2021 | Not reported |
| CIRCL KEV | Nov 3, 2021 | Nov 17, 2021 | Not reported |
| ENISA EUVD | Nov 3, 2021 | n/a | Not reported |
Required action: Apply updates per vendor instructions.
Affected Products
62 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| ChromeGoogle | >= unspecified | 91.0.4472.164 |
| chromiumarch | See advisory | 91.0.4472.164-1 |
| operaarch | See advisory | 77.0.4054.277-1 |
| vivaldiarch | See advisory | 4.0.2312.41-1 |
| qt5-qtwebenginealpine | See advisory | 5.15.3_git20211006-r0 |
Patched Releases
Chrome
91.0.4472.164
chromedriver
91.0.4472.164-bp153.2.16.1, 91.0.4472.164-lp152.2.113.2, 93.0.4577.82-1.1
chromium
91.0.4472.164-1, 91.0.4472.164-bp153.2.16.1, 91.0.4472.164-lp152.2.113.2, 91.0.4472.164-r0, 93.0.4577.82-1, 93.0.4577.82-1.1
chromium-browser
92.0.4515.159-0ubuntu0.18.04.1
libqt5-qtpdf-devel
5.15.6-2.1
libqt5-qtpdf-examples
5.15.6-2.1
libqt5-qtpdf-imports
5.15.6-2.1
libqt5-qtpdf-private-headers-devel
5.15.6-2.1
libqt5-qtwebengine
5.15.6-2.1
libqt5-qtwebengine-devel
5.15.6-2.1
libqt5-qtwebengine-examples
5.15.6-2.1
libqt5-qtwebengine-private-headers-devel
5.15.6-2.1
libQt5Pdf5
5.15.6-2.1
libQt5PdfWidgets5
5.15.6-2.1
opera
77.0.4054.277-1, 77.0.4054.277-lp152.2.55.1, 77.0.4054.277-lp153.2.9.1, 85.0.4341.28-lp154.2.5.1
qt5-qtwebengine
5.15.3_git20210510-r4, 5.15.3_git20211006-r0
ungoogled-chromium
113.0.5672.92-1.1
ungoogled-chromium-chromedriver
113.0.5672.92-1.1
vivaldi
4.0.2312.41-1
Timeline
Added to Industry KEV feed
Jul 12, 2021
Added to CISA KEV
Nov 3, 2021
Added to CIRCL KEV
Nov 3, 2021
Added to ENISA EUVD
Nov 3, 2021
Publicly disclosed
Dec 15, 2021
Last updated
Aug 4, 2026
Weakness Type
- CWE-843 Access of Resource Using Incompatible Type ('Type Confusion')
References
- advisoryhttps://chromereleases.googleblog.com/2021/07/stable-channel-update-for-desktop.html
- advisoryhttps://chromereleases.googleblog.com/2021/12/stable-channel-update-for-desktop_13.html
- advisoryhttps://crbug.com/1228407
- advisoryhttps://indianexpress.com/article/technology/tech-news-technology/google-chrome-releases-emergency-update-to-fix-multiple-security-vulnerabilities-7673638/
- advisoryhttps://security-tracker.debian.org/tracker/CVE-2021-30563
FAQ
Common Questions.
Type Confusion in V8 in Google Chrome prior to 91.0.4472.164 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.
Affected: Chrome (Google) versions >= unspecified; chromium (arch); opera (arch), among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jul 12, 2021.
Yes. It was added on Nov 3, 2021 with a federal remediation due date of Nov 17, 2021.
Public exploit code is available.
Fixed versions are available, including Chrome 91.0.4472.164, chromedriver 91.0.4472.164-bp153.2.16.1, chromedriver 91.0.4472.164-lp152.2.113.2.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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