High 8.8Known exploited (CISA KEV)Published Mar 9, 2021

CVE-2021-21166Data 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.

Updated under an hour ago (Oct 27, 2026, 7:23 PM ET)

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It affects Google Chrome and 2 other products. Add what you run to find out whether that includes you.

CISA lists it as known exploited since Nov 3, 2021; federal agencies had to remediate by Nov 17, 2021. Treat that date as your deadline.

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Exploited in the last 30 days

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.

CVSS: 8.8 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-362
Known exploited: Added to CISA KEV Nov 3, 2021; federal remediation due Nov 17, 2021Apply updates per vendor instructions.
EPSS (exploitation in the next 30 days): 24.03% (percentile 98)
Assigned by: Chrome
NVD analysis: Analyzed
Record last updated: Oct 21, 2025
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Google Chrome google:chrome (from the name)	from unspecified before 89.0.4389.72	CNA record
google chrome google:chrome	before 89.0.4389.72	NVD
fedoraproject fedora fedoraproject:fedora	32; 33; 34	NVD
debian debian_linux debian:debian_linux	10.0	NVD

References

References

https://chromereleases.googleblog.com/2021/03/stable-channel-update-for-desktop.html	x-refsource-misc, release-notes
https://crbug.com/1177465	x-refsource-misc, permissions-required
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FE5SIKEVYTMDCC5OSXGOM2KRPYLHYMQX/	vendor-advisory, x-refsource-fedora, release-notes
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BBT54RKAE5XLMWSHLVUKJ7T2XHHYMXLH/	vendor-advisory, x-refsource-fedora, release-notes
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LCIDZ77XUDMB2EBPPWCQXPEIJERDNSNT/	vendor-advisory, x-refsource-fedora, release-notes
https://www.debian.org/security/2021/dsa-4886	vendor-advisory, x-refsource-debian, mailing-list, third-party-advisory
https://security.gentoo.org/glsa/202104-08	vendor-advisory, x-refsource-gentoo, third-party-advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-21166	us-government-resource

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.