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CVE-2021-37973: Google Chromium Portals Use-After-Free Vulnerability
Google Chromium Portals · in CISA KEV since 2021-11-03
2021-11-03added to KEV
2021-11-17federal remediation due date
11.73%EPSS exploit probability (30 days) 95.9th percentile
9.6 CRITICALCVSS 3.1
Unknownknown ransomware use
26days from NVD publication to KEV
What it is
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 (CISA)
Apply updates per vendor instructions.
| CWE | CWE-416 |
|---|---|
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H |
| NVD published | 2021-10-08 (Analyzed) |
Original records: NVD · CISA KEV · JSON: /api/cve/CVE-2021-37973.json · all KEV CVEs
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Get the full file: Exploited Vulnerabilities Brief – September 2026 ($29): this month's KEV additions ranked by EPSS, ransomware use and due date, ready to hand to a patch team. Checkout by Polar.
Get the full file: Exploited Vulnerabilities Brief – September 2026 ($29): this month's KEV additions ranked by EPSS, ransomware use and due date, ready to hand to a patch team. Checkout by Polar.