CVE-2021-21206VulnerabilityPublished 11/03/2021Updated 10/24/2026

CVE-2021-21206: Google Chromium Blink Use-After-Free Vulnerability

Affects Google Chromium BlinkSource 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: 9.3% chance of exploitation in 30 days – higher than 95% of CVEs

What to do

CISA required action

Apply updates per vendor instructions.

nvd.nist.gov/vuln/detail/CVE-2021-21206 (opens in a new tab)

Description

CVE-2021-21206 is a use-after-free vulnerability in Google Chromium Blink that allows remote attackers to exploit heap corruption via a crafted HTML page. This vulnerability affects multiple Chromium-based browsers, including Google Chrome, Microsoft Edge, and Opera. It has been exploited in the wild. No specific affected versions or patch information is provided in the input data.

Summary

Google Chromium Blink contains a use-after-free vulnerability (CWE-416) that can be triggered by a crafted HTML page, potentially leading to heap corruption. This vulnerability impacts multiple browsers based on Chromium, such as Google Chrome, Microsoft Edge, and Opera. Exploitation of this vulnerability has been observed in the wild. The input data does not specify affected versions or patch availability.

Impact

Successful exploitation of this use-after-free vulnerability can lead to heap corruption, which may allow remote attackers to execute arbitrary code or cause a denial of service in affected Chromium-based browsers. The vulnerability has been exploited in the wild, indicating active threat.

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.

Weaknesses

CWE-416Use After Free (opens in a new tab)

What to do

Description

AnalysisAI-generated, updated 10/24/2026, 09:21:00 UTC

Weaknesses

References

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