CVE-2021-37973

As of 2025-10-24, CVE-2021-37973 is a CVSS 9.6 (CRITICAL-severity) vulnerability. CISA KEV-listed (known exploited). EPSS exploitation probability 6.5%. Threadlinqs Intelligence tracks 1 threat exploiting it.

Last updated: 2025-10-24

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.

CVSS v3 vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Weaknesses (CWE)

CWE-416

Exploitation status

CISA KEV-listed (known exploited)

Threats tracking this CVE

• Hack-for-Hire Espionage Campaign Targeting MENA Civil Society via Predator/Intellexa Mercenary Spyware — HIGH

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

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Enriched from CVE.org, NVD (this product uses the NVD API but is not endorsed or certified by the NVD), FIRST EPSS, CISA KEV, and GitHub Security Advisories.