CVE-2021-37973 — Google Chromium Portals

Google Chromium Portals Use-After-Free Vulnerability

Added to KEV

2021-11-03

Federal due date

2021-11-17

Vendor

Google

Product

Chromium Portals

EPSS

95.6th percentile (score 0.117, as of 2026-07-13)

NVD CVSS v3.1

—

Ransomware use

Unknown

Upstream

https://nvd.nist.gov/vuln/detail/CVE-2021-37973

CISA short description

Google Chromium Portals 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 affects web browsers that utilize Chromium, including Google Chrome and Microsoft Edge.

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.