CVE-2021-21220Google Chromium V8 Improper Input Validation Vulnerability

Insufficient validation of untrusted input in V8 in Google Chrome prior to 89.0.4389.128 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

8.8 HIGHEPSS 70.43%⚡ Known Exploited (CISA KEV)NVD: Analyzed

Last updated: 2026-06-17 03:35 UTC

OverviewCVSS details

8.8HIGHCVSS 3.1

Score source: NVD
NVD status: Analyzed
Published: Apr 26, 2021
Assigner: Chrome

Affected

Chrome (Google)

Versions: before 89.0.4389.128
Fixed in: 89.0.4389.128

Exploitation

Public exploit: Yes · 2 references
CISA KEV: Listed · Nov 3, 2021
KEV due date: Nov 17, 2021
Ransomware use: Unknown
SSVC: Exploitation active · Automatable no · Impact total

EPSS · FIRST, scored Nov 7

70.43%chance of exploitation in 30 days

Higher than 99.39% of CVEs

CVSS 3.1 · NVD

8.8High

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

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: Required
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

CVSS 2.0 · NVD

6.8Medium

AV:N/AC:M/Au:N/C:P/I:P/A:P

Attack vector: Network
Attack complexity: Medium
Authentication: None
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

NVD status: Analyzed

Overview Affected Products References

NVD CVE.org

Overview

Severity

Score	Severity	Version	Vector String
8.8	HIGH	3.1NVD	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8	MEDIUM	2.0NVD	AV:N/AC:M/Au:N/C:P/I:P/A:P

CISA required action

⚡ Known exploited · remediation due Nov 17, 2021

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Details

CVE ID: CVE-2021-21220
Status: Analyzed
Assigner (CNA): Chrome
Published: Apr 26, 2021
Last modified: 2026-06-17 03:35 UTC
Weaknesses: CWE-787
CWE-20
CWE-122

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-08 09:51 UTC.