CVE-2021-21166 — Google Chromium Race Condition Vulnerability
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.
Published
2021-03-09T17:46:13.000Z
Last modified
2025-10-21T23:25:52.370Z
CISA KEV — Actively Exploited
01What is this vulnerability?
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.
02Affected products
| Vendor | Product | Versions |
|---|
| Google | Chrome | unspecified |
03Active exploitation status
Yes — actively exploited. Added to the CISA KEV catalog on 2021-11-03. Ransomware use: Unknown.
04Recommended remediation
- Patch to a fixed version listed in the vendor advisory (see references below).
- Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
- Hunt historical logs for exploitation indicators — see Detection signatures below.
05Technical details
For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.
06Detection signatures
Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:
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07Related CVEs
No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.
08Timeline
- Published: 2021-03-09T17:46:13.000Z
- Last modified: 2025-10-21T23:25:52.370Z
- Added to CISA KEV: 2021-11-03
- BOD 22-01 due: 2021-11-17
09References
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