CVE-2021-30633Google Chromium Indexed DB API Use-After-Free Vulnerability

Use after free in Indexed DB API in Google Chrome prior to 93.0.4577.82 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page.

9.6 CRITICALEPSS 33.18%⚡ Known Exploited (CISA KEV)NVD: Analyzed

Last updated: 2026-06-17 03:50 UTC

OverviewCVSS details

9.6CRITICALCVSS 3.1

Score source: NVD
NVD status: Analyzed
Published: Oct 8, 2021
Assigner: Chrome

Affected

Chrome (Google)

Versions: before 93.0.4577.82
Fixed in: 93.0.4577.82

Exploitation

Public exploit: None listed
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

33.18%chance of exploitation in 30 days

Higher than 98.37% of CVEs

CVSS 3.1 · NVD

9.6Critical

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

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: Required
Scope: Changed
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
9.6	CRITICAL	3.1NVD	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/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-2021-30633
Status: Analyzed
Assigner (CNA): Chrome
Published: Oct 8, 2021
Last modified: 2026-06-17 03:50 UTC
Weaknesses: CWE-416

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-08 10:32 UTC.