Google Chromium Indexed DB API Use-After-Free Vulnerability

Are you affected?

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• cpe fedoraproject/fedora33
• cpe fedoraproject/fedora35
• cpe google/chromeversion unspecified
• vendor Google Chromium Indexed DB APIversion unspecified

How to fix CVE-2021-30633

• Recommended remediation

  Apply updates per vendor instructions. CISA due date Nov 17, 2021.

• Official advisories

  • CISA KEV · cisa.gov
  • CVE.org · cve.org
  • FIRST EPSS · first.org
  • NIST NVD · nvd.nist.gov
  • VulnCheck KEV · vulncheck.com

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

1. Oct 8, 2021 · Catalog

   Detected

   Google Chromium Indexed DB API contains a use-after-free vulnerability that allows a remote attacker, who has compromised the renderer process, to potentially perform a sandbox escape via a crafted HTML page. This vulnerability could affect multiple web browsers that utilize Chromium, including, but not limited to, Google Chrome, Microsoft Edge, and Opera.

2. Nov 3, 2021 · CISA KEV

   Known exploited

   Apply updates per vendor instructions.

3. Nov 17, 2021 · CISA KEV

   Remediation due

   Apply updates per vendor instructions.

4. Jun 16, 2026 · Catalog

   Updated

   Google Chromium Indexed DB API contains a use-after-free vulnerability that allows a remote attacker, who has compromised the renderer process, to potentially perform a sandbox escape via a crafted HTML page. This vulnerability could affect multiple web browsers that utilize Chromium, including, but not limited to, Google Chrome, Microsoft Edge, and Opera.

Sources

• CISA KEVConfirmed exploitationCVE-2021-30633

  Google Chromium Indexed DB API contains a use-after-free vulnerability that allows a remote attacker, who has compromised the renderer process, to potentially perform a sandbox escape via a crafted HTML page. This vulnerability could affect multiple web browsers that utilize Chromium, including, but not limited to, Google Chrome, Microsoft Edge, and Opera.

  cisa.gov
• CVE.orgVulnerability recordCVE-2021-30633

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2021-30633

  30-day exploitation probability 33.2%

  first.org
• NIST NVDVulnerability recordCVE-2021-30633

  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.

  nvd.nist.gov
• VulnCheck KEVConfirmed exploitationCVE-2021-30633

  Google Chromium Indexed DB API contains a use-after-free vulnerability that allows a remote attacker, who has compromised the renderer process, to potentially perform a sandbox escape via a crafted HTML page. This vulnerability could affect multiple web browsers that utilize Chro

  vulncheck.com

References

• Release Notes · chromereleases.googleblog.com
• Permissions Required · crbug.com
• VulnCheck exploitation evidence · docs.google.com
• Release Notes · lists.fedoraproject.org
• Release Notes · lists.fedoraproject.org
• CISA note · nvd.nist.gov
• VulnCheck exploitation evidence · cisa.gov

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.