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CVE-2021-37973

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.

Published: Oct 8, 2021Updated: Oct 24, 2025 Sources: CVE List NVD BDU
NVD MITRE
9.6CVSS
CRITICAL

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.

EPSS Score
14.8%
Top 5.4%
CISA KEV
Active Exploitation
Since Nov 3, 2021
Exploits
No Known Exploits
Remediation
Patch Available

CVSS Vector Breakdown

AV:NAC:LPR:NUI:RS:CC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High

Weaknesses

CWE-416

Affected Products

chrome
google
fedora
fedoraproject
debian linux
debian
Astra Linux Special Edition
ООО «РусБИТех-Астра»
Fedora
Fedora Project
and 5 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

CISA Known Exploited Vulnerability
Added to KEV:Nov 3, 2021
Remediation due:Nov 17, 2021

Required action: Apply updates per vendor instructions.

Official Patch Available

MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://chromereleases.googleblog.com/2021/09/stable-channel-update-for-desktop_24.html
chromereleases.googleblog.com
https://crbug.com/1251727
crbug.com
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4DDW7HAHTS3SDVXBQUY4SURELO5D4X7R/
lists.fedoraproject.org
and 12 more references View all →

Timeline

Published
Oct 8, 2021
Added to CISA KEV
Nov 3, 2021
Last Updated
Oct 24, 2025
News mentions
1

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