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Findings

CVE-2021-21220

Google Chromium V8 Improper Input Validation Vulnerability

Published Apr 26, 2021 · updated Jun 16, 2026 · google chrome

Google Chromium V8 Engine contains an improper input validation vulnerability that allows a remote attacker to potentially exploit heap corruption 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.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 26, 2021 · Catalog

    Detected

    Google Chromium V8 Engine contains an improper input validation vulnerability that allows a remote attacker to potentially exploit heap corruption 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 V8 Engine contains an improper input validation vulnerability that allows a remote attacker to potentially exploit heap corruption 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.

Required action

Apply updates per vendor instructions.

CISA due date Nov 17, 2021

Affected

  • cpe fedoraproject/fedora32
  • cpe fedoraproject/fedora33
  • cpe fedoraproject/fedora34
  • cpe google/chromeversion unspecified
  • vendor Google Chromium V8version unspecified

Sources

  • CISA KEVCVE-2021-21220

    Google Chromium V8 Engine contains an improper input validation vulnerability that allows a remote attacker to potentially exploit heap corruption 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.orgCVE-2021-21220

    Official CVE identifier

    cve.org
  • FIRST EPSSCVE-2021-21220

    30-day exploitation probability 70.4%

    first.org
  • Metasploit Modulesexploit_multi/browser/chrome_cve_2021_21220_v8_insufficient_validation

    Public module reference (manual). Module source is not copied into this catalog.

    rapid7.com
  • NIST NVDCVE-2021-21220

    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.

    nvd.nist.gov
  • Packet Storm Securityhttp://packetstormsecurity.com/files/162437/Google-Chrome-XOR-Typer-Out-Of-Bounds-Access-Remote-Code-Execution.html

    Packet Storm link already published on the finding.

    packetstormsecurity.com
  • Packet Storm Securityhttp://packetstormsecurity.com/files/176210/Chrome-V8-JIT-XOR-Arbitrary-Code-Execution.html

    Packet Storm link already published on the finding.

    packetstormsecurity.com

References