Exploited CVEs / Google / CVE-2021-30551
CVE-2021-30551
Google Chromium V8 Type Confusion Vulnerability. Exploitation in the wild is confirmed by CISA, not predicted. Federal agencies were required to remediate by 2021-11-17 (that deadline has passed); treat that date as the outer bound for your own environment. The fix is in the vendor advisory: Chrome Releases (security updates), linked below.
Actively exploited Google Chromium V8 vulnerability, High severity, CVSS 8.8. Added to the CISA KEV catalog 2021-11-03.
Risk summary
Updated July 26, 2026. Data refreshed on every build from MSRC, CISA KEV, and FIRST EPSS.
Senserva AI Opinion for CVE-2021-30551
This V8 type confusion flaw lets a crafted HTML page corrupt heap memory in any Chromium based browser, meaning Chrome, Edge, Brave, and Opera users are all in scope, not just Chrome. It is confirmed exploited in the wild (CISA KEV since 2021-11-03) with a 65 percent EPSS score, so the risk is drive by compromise from simply visiting a malicious site. Because it triggers through normal browsing, no user action beyond loading a page is required.
Do this: Push the Chromium based browser update that patches CVE-2021-30551 to all endpoints today and confirm your Edge, Brave, and Opera installs are also current.
AI-generated from public data, 2026-07-22. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2021-30551
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for CVE-2021-30551
Published and last-revised dates are authoritative, from Microsoft MSRC (or the CISA KEV date-added). Senserva additionally records day-to-day changes from 2026-07-07, refreshed several times a day; the change count reflects that forward-only tracking.
CISA required action
Federal (BOD 22-01) remediation due date: 2021-11-17 (past due).
Apply updates per vendor instructions.
Official fix for CVE-2021-30551
The authoritative fix and affected-version list are published by the vendor. Find the Chromium V8 advisory on Chrome Releases (security updates).
Common questions about CVE-2021-30551
Is CVE-2021-30551 actively exploited?
Yes. CVE-2021-30551 was added to the CISA Known Exploited Vulnerabilities (KEV) catalog on 2021-11-03, which means exploitation in the wild has been confirmed, not predicted. Its EPSS 30-day exploitation probability is 65%.
What is the CISA deadline and required action for CVE-2021-30551?
CISA set the federal (BOD 22-01) remediation due date at 2021-11-17, which has passed; treat any unremediated system as overdue. The verbatim required action: Apply updates per vendor instructions.
What fixes CVE-2021-30551?
The authoritative fix is in the vendor advisory: see Chrome Releases (security updates) for the patched Chromium V8 versions and any workarounds. KEV listing makes this a fix-first item: patch it ahead of higher-CVSS issues nobody is exploiting.
Can I ask my own AI about CVE-2021-30551?
Yes. This page includes a free, ready-to-paste AI prompt containing CVE-2021-30551's key facts: severity, CVSS, EPSS, the KEV date, the CISA due date, and the required action. Copy it into Claude, ChatGPT, or Copilot; the data is refreshed twice a day (5 AM and 3 PM US Central).
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Authoritative references
Every actively exploited CVE, searchable with due dates and CSV export: the exploited-CVE tracker. The newest additions: exploited this week.
