Exploitation Summary
CVE-2021-21166 is actively exploited and listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added November 3, 2021.
Description
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.
References (8)
Core 8
Core References
Release Notes x_refsource_misc
https://chromereleases.googleblog.com/2021/03/stable-channel-update-for-desktop.html
Permissions Required x_refsource_misc
https://crbug.com/1177465
Release Notes vendor-advisory
x_refsource_fedora
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FE5SIKEVYTMDCC5OSXGOM2KRPYLHYMQX/
Release Notes vendor-advisory
x_refsource_fedora
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BBT54RKAE5XLMWSHLVUKJ7T2XHHYMXLH/
Release Notes vendor-advisory
x_refsource_fedora
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LCIDZ77XUDMB2EBPPWCQXPEIJERDNSNT/
Mailing List, Third Party Advisory vendor-advisory
x_refsource_debian
https://www.debian.org/security/2021/dsa-4886
Third Party Advisory vendor-advisory
x_refsource_gentoo
https://security.gentoo.org/glsa/202104-08
US Government Resource
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-21166
Scores
CVSS v3
8.8
EPSS
0.3798
EPSS Percentile
97.3%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CISA SSVC
Vulnrichment
Exploitation
active
Automatable
no
Technical Impact
total
Details
CISA KEV
2021-11-03
VulnCheck KEV
2021-02-11
InTheWild.io
2021-02-11
ENISA EUVD
EUVD-2021-8557
CWE
CWE-362
Status
published
Products (5)
debian/debian_linux
10.0
fedoraproject/fedora
32
fedoraproject/fedora
33
fedoraproject/fedora
34
google/chrome
< 89.0.4389.72
Published
Mar 09, 2021
KEV Added
Nov 03, 2021
Tracked Since
Feb 18, 2026