Reference page — cumulative record through Thursday, October 8, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2021-37973

CVE-2021-37973CRITICAL

Google Chromium Portals

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   R  C  H  H  H    9.6   .1173   96.0   YES

AFFECTED
  Product  Versions       Fixed
  Chrome   unspecified –  —

TIMELINE
  Aug 3   Reserved by Chrome
  Oct 8   Published (CNA: Chrome)
  Nov 3   Added to CISA KEV, remediation due 2021-11-17

CWE-416 · CNA: Chrome · CVSS v3.1 · 6 references · KEV due November 17, 2021

Description

Use after free in Portals in Google Chrome prior to 94.0.4606.61 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
August 3, 2021	Reserved	Reserved by Chrome
October 8, 2021	Published	Published (CNA: Chrome)
November 3, 2021	KEV ADDED	Added to CISA KEV, remediation due 2021-11-17

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Google	Chrome	—	unspecified	—

Weaknesses

CWE-416

References (6)

https://chromereleases.googleblog.com/2021/09/stable-channel-update-for-desktop_24.html [x_refsource_MISC]
https://crbug.com/1251727 [x_refsource_MISC]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4DDW7HAHTS3SDVXBQUY4SURELO5D4X7R/ [vendor-advisory, x_refsource_FEDORA]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PM7MOYYHJSWLIFZ4TPJTD7MSA3HSSLV2/ [vendor-advisory, x_refsource_FEDORA]
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-37973 [government-resource]
https://www.debian.org/security/2022/dsa-5046 [vendor-advisory, x_refsource_DEBIAN]

Authoritative record: CVE-2021-37973 at cve.org

Vendors: google

Weaknesses: CWE-416

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-37973 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Thursday, October 8, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.