Detections
Analytics

CVE-2021-37973

critical

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.

References

https://www.debian.org/security/2022/dsa-5046

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PM7MOYYHJSWLIFZ4TPJTD7MSA3HSSLV2/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4DDW7HAHTS3SDVXBQUY4SURELO5D4X7R/

https://cloud.google.com/blog/topics/threat-intelligence/2025-zero-day-review/

https://thehackernews.com/2025/12/intellexa-leaks-reveal-zero-days-and.html

https://thehackernews.com/2024/08/russian-hackers-exploit-safari-and.html

https://www.tenable.com/cyber-exposure/2021-threat-landscape-retrospective

https://www.helpnetsecurity.com/2024/08/29/n-day-exploits-government-websites/

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-37973

https://crbug.com/1251727

https://chromereleases.googleblog.com/2021/09/stable-channel-update-for-desktop_24.html

Details

Source: Mitre, NVD

Published: 2021-10-08

Updated: 2025-10-24

Known Exploited Vulnerability (KEV)

Risk Information

CVSS v2

Base Score: 6.8

Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P

Severity: Medium

CVSS v3

Base Score: 9.6

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

Severity: Critical

EPSS

EPSS: 0.15636