CVE-2021-21224highunder attackCWE-843

CVE-2021-21224: high-severity vulnerability in Google Chrome

Published · Updated

93Vexday Risk Score

Prioritize patching. It under exploitation confirmed by CISA and has a public proof of concept.

ssvc Actcvss 8.8epss 84%
from disclosure to weapon681 days
Published on NVDApr 26
1st PoC+681d
CISA KEV+191d
exploitation probability
84%top 1% of all CVEs
observed exploitation
yesCISA + VulnCheck
1 public exploit(s)
What the vendors declare (VEX)

Official vendor statements in CSAF/VEX format: whether their product is affected, already fixed, or ruled out — and why. These are the vendor's assertions, not Vexday's judgment.

Red HatVEX document ↗
Not affected
1 product — because the vulnerable code is not present in the product
red_hat_products
Action required by CISAfederal deadline: 2021-11-17

Apply updates per vendor instructions.

In short

A type confusion bug in Chrome's V8 engine allowed attackers to run malicious code inside the browser's sandbox by tricking it with a specially crafted webpage. This could let attackers steal data or compromise your computer.

Technical detail

Type confusion vulnerability in V8 (CWE-843) where incorrect type handling enables arbitrary code execution within the Chrome sandbox. Attack vector is remote via crafted HTML; requires user to visit a malicious webpage. Pre-conditions: victim uses vulnerable Chrome version <90.0.4430.85. Impact includes sandbox escape and arbitrary code execution.

Summary generated and translated by AI from the official description.

The full analysis of this CVE is available in Portuguese →

Type confusion in V8 in Google Chrome prior to 90.0.4430.85 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Affected products
Google · Chrome
public PoCs found — 1
vulncheckvulncheck.com/xdb/7eba2235c681unverified
⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
Related CVEs — Google Chrome

In the same product, most dangerous first.

CVE-2023-4863HIGHCVE-2023-4863EPSS 100.0%KEVCVE-2018-17463HIGHCVE-2018-17463EPSS 84.6%KEVCVE-2020-6418HIGHCVE-2020-6418EPSS 78.8%KEVCVE-2022-2294HIGHCVE-2022-2294EPSS 70.5%KEVCVE-2021-21220HIGHCVE-2021-21220EPSS 70.4%KEVCVE-2021-30551HIGHCVE-2021-30551EPSS 64.7%KEV
References
https://chromereleases.googleblog.com/2021/04/stable-channel-update-for-desktop_20.htmlhttps://crbug.com/1195777https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EAJ42L4JFPBJATCZ7MOZQTUDGV4OEHHG/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/U3GZ42MYPGD35V652ZPVPYYS7A7LVXVY/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VUZBGKGVZADNA3I24NVG7HAYYUTOSN5A/https://security.gentoo.org/glsa/202104-08https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-21224https://www.debian.org/security/2021/dsa-4906