# CVE-2021-21206: Google Chromium Blink Use-After-Free Vulnerability

Source: https://junglewise.ai/threats/cve-2021-21206-google-chromium-blink-use-after-free-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2021-11-03. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

CVE-2021-21206 · Severity: critical · CVSS 8.8 · Exploited in the wild · Published 2021-11-03

A use-after-free vulnerability in the Blink engine of Google Chromium allows remote attackers to execute arbitrary code or cause heap corruption via a specially crafted HTML page. This vulnerability was exploited in the wild prior to being patched.

Vendors: [Google](https://junglewise.ai/threats/vendors/google).

## Quick answers

**Is CVE-2021-21206 exploited in the wild?** Yes. CVE-2021-21206 is known to be exploited in the wild, first recorded on 3 November 2021. Treat it as urgent.

**How severe is CVE-2021-21206?** Critical severity, with a CVSS score of 8.8, published 3 November 2021.

**Which products and versions are affected?** Google Chrome prior to 89.0.4389.128; Microsoft Edge; Opera Opera.

**Is there a fix for CVE-2021-21206?** A patch was published on 2021-04-13: Chrome stable channel update 89.0.4389.128 released Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2021-21206 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2021-21206?** Check whether you run Google Chromium Blink. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Google Chrome prior to 89.0.4389.128
- Microsoft Edge
- Opera Opera

## Timeline

- 2021-04-13: patched: Chrome stable channel update 89.0.4389.128 released
- 2021-11-03: kev added: Added to CISA Known Exploited Vulnerabilities Catalog
- 2021-11-03: disclosed

## Related threats

- [Google Chromium Blink Use-After-Free Vulnerability](https://junglewise.ai/threats/cve-2021-21193-google-chromium-blink-use-after-free-vulnerability)