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Findings

CVE-2021-37973

Google Chromium Portals Use-After-Free Vulnerability

Published Oct 8, 2021 · updated Jun 16, 2026 · google chrome

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.

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.

Required action

Apply updates per vendor instructions.

CISA due date Nov 17, 2021

Affected

  • 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

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

References