What is CVE-2021-21166?

CVE-2021-21166 is a vulnerability in Google Chrome. Published 2021-03-09.

Is CVE-2021-21166 known to be exploited?

Yes. CVE-2021-21166 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating it is being actively exploited. 2 public proof-of-concept repositories are indexed.

Vulnerability in Google Chrome

CVE-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.

EPSS: 0.380 (97.3th percentile) — read the EPSS interpretation.

Affected products

Google Chrome — versions unspecified

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2021-11-03. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2021-11-17.

Required action: Apply updates per vendor instructions.

Public proof-of-concept exploits

References

chromereleases.googleblog.com/2021/03/stable-channel-update-for-desktop.html (x_refsource_MISC)
crbug.com/1177465 (x_refsource_MISC)
FEDORA-2021-c88a96bd4b (vendor-advisory, x_refsource_FEDORA)
FEDORA-2021-4740239e28 (vendor-advisory, x_refsource_FEDORA)
FEDORA-2021-78547312f2 (vendor-advisory, x_refsource_FEDORA)
DSA-4886 (vendor-advisory, x_refsource_DEBIAN)
GLSA-202104-08 (vendor-advisory, x_refsource_GENTOO)

Frequently asked questions

What is CVE-2021-21166?: CVE-2021-21166 is a vulnerability in Google Chrome. Published 2021-03-09.
Is CVE-2021-21166 known to be exploited?: Yes. CVE-2021-21166 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating it is being actively exploited. 2 public proof-of-concept repositories are indexed.