CVE-2021-4102VulnerabilityPublished 12/15/2021Updated 10/24/2026

CVE-2021-4102: Google Chromium V8 Use-After-Free Vulnerability

Affects Google Chromium V8Source CISA KEV

Severity

High

No CVSS score published yet

Exploitation: Actively exploited – in CISA KEV since 12/15/2021
KEV deadline: 12/29/2021
EPSS: 7.8% chance of exploitation in 30 days – higher than 94% of CVEs

What to do

CISA required action

Apply updates per vendor instructions.

nvd.nist.gov/vuln/detail/CVE-2021-4102 (opens in a new tab)

Description

CVE-2021-4102 is a use-after-free vulnerability in the Google Chromium V8 JavaScript engine that can be exploited by a remote attacker via a crafted HTML page. This vulnerability affects multiple Chromium-based web browsers such as Google Chrome, Microsoft Edge, and Opera. Exploitation can lead to heap corruption, potentially allowing arbitrary code execution or other malicious outcomes. The vulnerability has been observed exploited in the wild. No explicit patch or remediation details are provided in the available data.

Summary

The Google Chromium V8 engine contains a use-after-free vulnerability (CWE-416) that allows remote attackers to cause heap corruption by delivering a specially crafted HTML page. This flaw affects multiple Chromium-based browsers, including Google Chrome, Microsoft Edge, and Opera. The vulnerability has been exploited in the wild, indicating active threat. No vendor advisory or patch information is provided in the input data.

Impact

Successful exploitation of this use-after-free vulnerability can lead to heap corruption, which may allow attackers to execute arbitrary code remotely within the context of the affected browser. This poses a high risk to users of Chromium-based browsers, potentially compromising confidentiality, integrity, and availability of the affected systems.

Mitigation

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, users should exercise caution when visiting untrusted websites and consider using browser security features or sandboxing to mitigate potential exploitation.

Weaknesses

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

What to do

Description

AnalysisAI-generated, updated 10/24/2026, 09:56:12 UTC

Weaknesses

References

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