CVE-2021-30632VulnerabilityPublished 11/03/2021Updated 10/24/2026

CVE-2021-30632: Google Chromium V8 Out-of-Bounds Write 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: 63.2% 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-2021-30632 (opens in a new tab)

Description

CVE-2021-30632 is an out-of-bounds write vulnerability in the Google Chromium V8 JavaScript engine. It allows a remote attacker to potentially cause heap corruption by crafting a malicious HTML page. This vulnerability affects multiple Chromium-based web browsers including Google Chrome, Microsoft Edge, and Opera. Exploitation of this flaw has been observed in the wild. No explicit patch information is provided in the input data.

Summary

The vulnerability CVE-2021-30632 exists in the Google Chromium V8 engine and involves an out-of-bounds write condition. This flaw can be triggered remotely by an attacker who crafts a malicious HTML page, potentially leading to heap corruption. Multiple Chromium-based browsers are impacted due to their use of the V8 engine. The vulnerability is classified under CWE-122 (Heap-based Buffer Overflow). Exploits have been observed in the wild, indicating active targeting.

Impact

Successful exploitation can lead to heap corruption, which may allow an attacker to execute arbitrary code or cause a denial of service in affected browsers. Since the vulnerability is remotely exploitable via crafted web content, users visiting malicious or compromised websites are at risk. The presence of known exploits in the wild increases the urgency and risk associated with this vulnerability.

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. Until a fix is applied, consider limiting exposure to untrusted web content or using browser security features that mitigate exploitation risks.

Weaknesses

CWE-122Heap-based Buffer Overflow (opens in a new tab)

What to do

Description

AnalysisAI-generated, updated 10/24/2026, 09:26:13 UTC

Weaknesses

References

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