Google · Chromium
CVE-2021-21166
Google Chromium Race Condition Vulnerability
What it is
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.
CISA: 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.
What to do
Apply updates per vendor instructions.
Deadline for US federal agencies: November 17, 2021
- Added to the CISA list
- November 3, 2021
- Published
- March 9, 2021
- Severity
- High 8.8 CVSS 3.1
- Chance of attacks in the next 30 days (EPSS)
- 24% in the top 2.2% of all known vulnerabilities
- Weakness
- CWE-122 CWE-362
- More details
- NVD · CVE.org · CISA
All references (7)
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FE5SIKEVYTMD…
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BBT54RKAE5XL…
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LCIDZ77XUDMB…
- https://www.debian.org/security/2021/dsa-4886
- https://security.gentoo.org/glsa/202104-08
- https://chromereleases.googleblog.com/2021/03/stable-channel-update-for-desktop.html
- https://crbug.com/1177465
More exploited flaws from Google
| Added | Vulnerability | Product | Severity | Attack chance |
|---|---|---|---|---|
| Feb 17, 2026 | CSS Use-After-Free | Chromium | High 8.8 | 55% |
| Dec 12, 2025 | Out of Bounds Memory Access | Chromium | High 8.8 | 55% |
| Jul 22, 2025 | ANGLE and GPU Improper Input Validation | Chromium | High 8.8 | 11% |
| May 13, 2024 | Visuals Use-After-Free | Chromium | Critical 9.6 | 8.3% |
| Nov 3, 2021 | Information Disclosure | Chromium | Medium 6.5 | 20% |
| Oct 27, 2026 | Unchecked Return Value | Brotli | Critical 9.2 | 55% |
| Sep 16, 2026 | Improper Authorization | Pixel | High 8.8 | 0.6% |
| Sep 9, 2026 | Out of Bounds Write | Chromium V8 | High 8.8 | 3.5% |
Sources: Known Exploited Vulnerabilities (CISA, public domain), CVE records (cve.org) and EPSS (FIRST). The chance of attacks is the EPSS estimate that someone will try to exploit the flaw in the next 30 days.