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HomeCVEsCVE-2021-37973

CVE-2021-37973

Published: January 26, 2026
Last updated:1 day ago (January 26, 2026)
Exploit: YesZero-day: YesPatch: YesTrend: Neutral
TL;DR
Updated January 26, 2026

CVE-2021-37973 is a critical severity vulnerability with a CVSS score of 9.6. Exploits are available; patches have been released and should be applied urgently. This is classified as a zero-day vulnerability.

Key Points
  • 1Critical severity (CVSS 9.6/10)
  • 2EPSS: 4.00% - moderate likelihood of exploitation
  • 3Public exploits are available
  • 4Vendor patches are available
  • 5Strobes Priority Score: 999/1000 (Critical)
  • 6Affects products from: Fedoraproject, Debian, Google
Severity Scores
CVSS v39.6
CVSS v26.8
Priority Score999.0
EPSS Score4.0
Critical
Exploitation LikelihoodLow
4.00%EPSS

Lower probability of exploitation

Patch during regular maintenance
4.00%
EPSS
9.6
CVSS
Yes
Exploit
Yes
Patch
Critical Priority
exploit exists • critical severity • high priority

EPSS predicts the probability of exploitation in the next 30 days based on real-world threat data, complementing CVSS severity scores with actual risk assessment.

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.

CVSS v3 Breakdown
Attack Vector:Network
Attack Complexity:Local
Privileges Required:Network
User Interaction:Required
Scope:Changed
Confidentiality:High
Integrity:High
Availability:High
Exploit References
Cisa.gov
Patch References
Chromereleases.googleblog.comChrome Cve [email protected]Zeroday CZ
Trend Analysis
Neutral
Vulnerable Products
VendorProduct
FedoraprojectFedora
DebianDebian Linux
GoogleChrome
Advisories
CISA: 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.
GitHub AdvisoryNVD
Cite This Page
APA Format
Strobes VI. (2026). CVE-2021-37973 - CVE Details and Analysis. Strobes VI. Retrieved January 27, 2026, from https://vi.strobes.co/cve/CVE-2021-37973
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