CVE-2021-30633 — Google Chromium Indexed DB API

Google Chromium Indexed DB API Use-After-Free Vulnerability

Added to KEV

2021-11-03

Federal due date

2021-11-17

Vendor

Google

Product

Chromium Indexed DB API

EPSS

96.8th percentile (score 0.301, as of 2026-06-08)

NVD CVSS v3.1

—

Ransomware use

Unknown

Upstream

https://nvd.nist.gov/vuln/detail/CVE-2021-30633

CISA short description

Google Chromium Indexed DB API contains a use-after-free vulnerability that allows a remote attacker, who has compromised the renderer process, to potentially perform a sandbox escape 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.

Required action

Apply updates per vendor instructions.

EPSS percentile is the FIRST.org exploit-probability ranking as of the date noted above; it moves daily. CVSS reflects NVD's analysis at time of publication.