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CVE-2021-21193

HighPublished

Google Chromium Blink Use-After-Free Vulnerability

Published: Mar 16, 2021
Updated: Oct 21, 2025
Assigning CNA: Chrome
Evidence observed: Nov 3, 2021

Primary CVSS

8.8/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS probability estimate

9.9%

Low · next 30 days

Percentile: 95.4%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

CISA Known Exploited

This CVE appears in the CISA Known Exploited Vulnerabilities catalog.

Summary

Use after free in Blink in Google Chrome prior to 89.0.4389.90 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

Sources

CVE-2021-21193Research
Educational presentation analyzing CVE-2021-21193, a use-after-free vulnerability in Google Chrome's Blink engine, including exploitation details and mitigation advice.

Responsible use

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