CVE-2021-21220
HighExploitedPublic exploitInsufficient validation of untrusted input in V8 in Google Chrome prior to 89.0.4389.128 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-2021-21220, UBUNTU-CVE-2021-21220
Key Facts
Patch immediately- CVE-2021-21220 is a high-severity vulnerability (CVSS 8.8 v3.1) affecting Chrome (Google), Fedora (Fedoraproject), chromium (arch) and 8 more products.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jun 8, 2021. Public exploit code is available.
- EPSS estimates a 70% probability of exploitation in the next 30 days.
- Fixed versions are available, including Chrome 89.0.4389.128, chromedriver 89.0.4389.128-bp152.2.71.1, chromedriver 89.0.4389.128-lp152.2.86.1.
- 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)
70%
Higher than 99.3% 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-2021-21220 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
Insufficient validation of untrusted input in V8 in Google Chrome prior to 89.0.4389.128 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 | Jun 8, 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
53 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| ChromeGoogle | >= unspecified | 89.0.4389.128 |
| FedoraFedoraproject | 32, 33, 34 | n/a |
| chromiumarch | See advisory | 89.0.4389.128-1 |
| operaarch | See advisory | 75.0.3969.218-1 |
| vivaldiarch | See advisory | 3.7.2218.55-1 |
Patched Releases
Chrome
89.0.4389.128
chromedriver
89.0.4389.128-bp152.2.71.1, 89.0.4389.128-lp152.2.86.1, 93.0.4577.82-1.1
chromium
89.0.4389.128-1, 89.0.4389.128-bp152.2.71.1, 89.0.4389.128-lp152.2.86.1, 89.0.4389.128-r0, 90.0.4430.72-1, 93.0.4577.82-1.1
chromium-browser
90.0.4430.72-0ubuntu0.16.04.1, 90.0.4430.72-0ubuntu0.18.04.1
nodejs
16.20.0-1.ph3
opera
75.0.3969.218-1, 76.0.4017.94-lp152.2.43.1
qt5-qtwebengine
5.15.3_git20210510-r0
ungoogled-chromium
113.0.5672.92-1.1
ungoogled-chromium-chromedriver
113.0.5672.92-1.1
vivaldi
3.7.2218.55-1
Timeline
Added to Industry KEV feed
Jun 8, 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-787 Out-of-bounds Write
References
- advisoryhttp://packetstormsecurity.com/files/176210/Chrome-V8-JIT-XOR-Arbitrary-Code-Execution.html
- advisoryhttps://chromereleases.googleblog.com/2021/12/stable-channel-update-for-desktop_13.html
- advisoryhttps://indianexpress.com/article/technology/tech-news-technology/google-chrome-releases-emergency-update-to-fix-multiple-security-vulnerabilities-7673638/
- advisoryGLSA-202104-08
- advisoryhttps://security-tracker.debian.org/tracker/CVE-2021-21220
FAQ
Common Questions.
Insufficient validation of untrusted input in V8 in Google Chrome prior to 89.0.4389.128 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.
Affected: Chrome (Google) versions >= unspecified; Fedora (Fedoraproject) versions 32, 33, 34; chromium (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 Jun 8, 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 89.0.4389.128, chromedriver 89.0.4389.128-bp152.2.71.1, chromedriver 89.0.4389.128-lp152.2.86.1.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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