CVE-2021-21220
Google Chromium V8 Improper Input Validation Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.
Required action
Apply updates per vendor instructions.
CISA notes
https://nvd.nist.gov/vuln/detail/CVE-2021-21220
Description
Insufficient validation of untrusted input in V8 in Google Chrome prior to 89.0.4389.128 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.
Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HExploitation Context
as of October 15, 2026- CISA added CVE-2021-21220 to the KEV catalog 191 days after its CVE record was published.
- It is one of 75 Google entries in the CISA KEV catalog, and one of 23 added in 2021.
- Its current EPSS score (70.4%) is higher than that of 58% of CISA KEV entries.
Affected Products
| Vendor | Product | Affected versions |
|---|---|---|
Google Chrome | unspecified to <89.0.4389.128 |
References
8 Links- https://chromereleases.googleblog.com/2021/04/stable-channel-update-for-desktop.html
- https://crbug.com/1196683
- http://packetstormsecurity.com/files/162437/Google-Chrome-XOR-Typer-Out-Of-Bounds-Access-Remote-Code-Execution.html
- http://packetstormsecurity.com/files/176210/Chrome-V8-JIT-XOR-Arbitrary-Code-Execution.html
Record Details
More from Google
Google Chromium V8 Remote Code Execution Vulnerability
Google Chromium V8 Type Confusion Vulnerability
Google Chromium V8 Type Confusion Vulnerability
Google Chromium V8 Type Confusion Vulnerability
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