What’s Vulnerable › Vulnerabilities

CVE-2021-37973: Google Chromium Portals Use-After-Free Vulnerability

• Severity: critical (CVSS 9.6 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2021-11-03
• EPSS: 11.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-10-08 · updated 2026-06-17
• Weakness: CWE-416

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.

Affected products

• Debian Linux: 10.0, 11.0
• Fedoraproject Fedora: 33, 35
• Google Chrome: before 94.0.4606.61 — fixed in 94.0.4606.61

How to fix

Upgrade to a fixed version: Google Chrome 94.0.4606.61. Check the vendor advisory for mitigations.

References

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

Get alerted when CVE-2021-37973 or the next vulnerability affects your stack