CVE-2021-21166
Google Chromium Race Condition Vulnerability
Published Mar 9, 2021 · updated Jun 16, 2026 · google chrome
Google Chromium contains a race condition 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.
Mar 9, 2021 · Catalog
Detected
Google Chromium contains a race condition 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.
Nov 3, 2021 · CISA KEV
Known exploited
Apply updates per vendor instructions.
Nov 17, 2021 · CISA KEV
Remediation due
Apply updates per vendor instructions.
Jun 16, 2026 · Catalog
Updated
Google Chromium contains a race condition 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 debian/debian linux10.0
- cpe fedoraproject/fedora32
- cpe fedoraproject/fedora33
- cpe fedoraproject/fedora34
- cpe google/chromeversion unspecified
- vendor Google Chromiumversion unspecified
Sources
- CISA KEVCVE-2021-21166
Google Chromium contains a race condition 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-2021-21166
Official CVE identifier
cve.org - FIRST EPSSCVE-2021-21166
30-day exploitation probability 24.0%
first.org - NIST NVDCVE-2021-21166
Data race in audio in Google Chrome prior to 89.0.4389.72 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.
nvd.nist.gov