Google Chromium Portals Use-After-Free Vulnerability

Are you affected?

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• cpe debian/debian linux10.0
• cpe debian/debian linux11.0
• cpe fedoraproject/fedora33
• cpe fedoraproject/fedora35
• cpe google/chromeversion unspecified
• vendor Google Chromium Portalsversion unspecified

How to fix CVE-2021-37973

• 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 Portals 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 affects web browsers that utilize Chromium, including Google Chrome and Microsoft Edge.

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 Portals 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 affects web browsers that utilize Chromium, including Google Chrome and Microsoft Edge.

Sources

• CISA KEVConfirmed exploitationCVE-2021-37973

  Google Chromium Portals 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 affects web browsers that utilize Chromium, including Google Chrome and Microsoft Edge.

  cisa.gov
• CVE.orgVulnerability recordCVE-2021-37973

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2021-37973

  30-day exploitation probability 11.7%

  first.org
• NIST NVDVulnerability recordCVE-2021-37973

  Use after free in Portals in Google Chrome prior to 94.0.4606.61 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-2021-37973

  Google Chromium Portals 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 affects web browsers that utilize Chromium, including Googl

  vulncheck.com

References

• VulnCheck exploitation evidence · blog.google
• VulnCheck exploitation evidence · blog.google
• VulnCheck exploitation evidence · blog.talosintelligence.com
• Release Notes · chromereleases.googleblog.com
• Issue Tracking · 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 · storage.googleapis.com
• VulnCheck exploitation evidence · cisa.gov
• Mailing List · debian.org

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.