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

> CVE-2021-37973: Google Chromium Portals Use-After-Free Vulnerability. CVSS 9.6 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2021-37973
Last updated: 2025-10-21T23:25:29Z

- Published: 2021-10-08 21:40 UTC · Updated: 2025-10-21 23:25 UTC · Assigner: Chrome
- CVSS: 9.6 (CVSS 3.1) · Severity: Critical · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
- EPSS: 11.7%, 96th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2021-11-03, federal due date 2021-11-17, ransomware use: Unknown

## 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.

## CISA required action

Apply updates per vendor instructions.

## Affected vendors and products

- Google: Chrome

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2021-37973)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2021-37973)
- [https://chromereleases.googleblog.com/2021/09/stable-channel-update-for-desktop\_24.html](https://chromereleases.googleblog.com/2021/09/stable-channel-update-for-desktop_24.html)
- [https://crbug.com/1251727](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%2540lists.fedoraproject.org/message/4DDW7HAHTS3SDVXBQUY4SURELO5D4X7R/)
- [https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PM7MOYYHJSWLIFZ4TPJTD7MSA3HSSLV2/](https://lists.fedoraproject.org/archives/list/package-announce%2540lists.fedoraproject.org/message/PM7MOYYHJSWLIFZ4TPJTD7MSA3HSSLV2/)
- [https://www.debian.org/security/2022/dsa-5046](https://www.debian.org/security/2022/dsa-5046)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2021-37973 · Markdown: https://rewindex.com/cve/CVE-2021-37973.md · JSON: https://rewindex.com/api/v1/cves/CVE-2021-37973 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:16:41.735Z