CVE-2021-37973

CVE Enrichment

CVSS: 9.6 CRITICAL
EPSS: 11.74%
EPSS Percentile: 95.99%
CISA KEV: YES — Known Exploited Vulnerability

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.

Technical Details

CVSS Version: 3.1
CNA / NVD Source: chrome-cve-admin@google.com
Published: 09-Oct-2021 05:15
Last Modified: 17-Jun-2026 11:01
EPSS Date: 2026-10-12
CWE: CWE-416

CVSS Vector


            CVSS:3.1                            AV:N /
                            AC:L /
                            PR:N /
                            UI:R /
                            S:C /
                            C:H /
                            I:H /
                            A:H

CISA KEV Details

Date Added: 2021-11-03
Remediation Due: 2021-11-17
Known Ransomware Campaign Use: Unknown
Required Action: Apply updates per vendor instructions.
Notes: https://nvd.nist.gov/vuln/detail/CVE-2021-37973

Affected Products / Versions

google / chrome
Version / affected range: * · before (exclusive) 94.0.4606.61
cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*
fedoraproject / fedora
Version / affected range: 33
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
fedoraproject / fedora
Version / affected range: 35
cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
debian / debian_linux
Version / affected range: 10.0
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
debian / debian_linux
Version / affected range: 11.0
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*

References

Last enrichment sync: 13-Oct-2026 12:00
Sources: NVD · FIRST EPSS · CISA KEV
Latest successful provider update; providers refresh independently.

Reported Context (1)

The vulnerabilities, which were discovered in 2021, are CVE-2021-37973, CVE-2021-37976, CVE-2021-38000, CVE-2021-38003 — all of which affect Google Chrome, and CVE-2021-1048 in Linux and Android. Cisco Talos Details How Intellexa’s ALIEN and PREDATOR Spyware Target Android

CVE (4)

Malware (2)

MITRE ATT&CK (7)

Vendors (3)

Products (6)

Tools (2)

Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.