CVE-2021-30551VulnerabilityPublished 11/03/2021Updated 10/24/2026

CVE-2021-30551: Google Chromium V8 Type Confusion Vulnerability

Affects Google Chromium V8Source CISA KEV

Severity

High

No CVSS score published yet

Exploitation: Actively exploited – in CISA KEV since 11/03/2021
KEV deadline: 11/17/2021
EPSS: 64.7% chance of exploitation in 30 days – higher than 99% of CVEs

What to do

CISA required action

Apply updates per vendor instructions.

nvd.nist.gov/vuln/detail/CVE-2021-30551 (opens in a new tab)

Description

CVE-2021-30551 is a type confusion vulnerability in the Google Chromium V8 JavaScript engine that allows remote attackers to potentially cause heap corruption by crafting malicious HTML pages. This vulnerability affects multiple Chromium-based web browsers, including Google Chrome, Microsoft Edge, and Opera. It has been exploited in the wild. No explicit patch information is provided in the input data.

Summary

The Google Chromium V8 engine contains a type confusion vulnerability (CWE-122, CWE-843) that can be triggered remotely via a crafted HTML page, potentially leading to heap corruption. This flaw affects multiple browsers built on Chromium, such as Google Chrome, Microsoft Edge, and Opera. The vulnerability has been observed exploited in the wild, indicating active threat usage. No vendor advisory or patch details are included in the provided data.

Impact

Successful exploitation can lead to heap corruption, which may allow attackers to execute arbitrary code or cause denial of service in affected Chromium-based browsers. The vulnerability's exploitation in the wild confirms its practical risk to users of these browsers.

Mitigation

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Users and administrators should monitor official Google Chromium security advisories for updates and apply patches promptly once available.

CVE-2021-30551: Google Chromium V8 Type Confusion Vulnerability

What to do

Description

Summary

Impact

Mitigation

Weaknesses

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What to do

Description

AnalysisAI-generated, updated 10/24/2026, 09:26:00 UTC

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