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

criticalknown exploitedCVE-2021-37973
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Google Chromium Portals contains a use-after-free vulnerability that allows a remote attacker, who has compromised the renderer process, to potentially perform a sandbox escape via a crafted HTML page. This vulnerability affects web browsers that utilize Chromium, including Google Chrome and Microsoft Edge.

CSIRTS triage

vendor: Googleproduct: ChromiumMemory corruption
What
A use-after-free vulnerability allows a remote attacker to potentially perform a sandbox escape.
Who is affected
Users of web browsers utilizing Chromium, including Google Chrome and Microsoft Edge.
Urgency
Remediation is critical due to active exploitation and the severity of the vulnerability.
Action
Update to the latest version of Chromium-based browsers.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2021-11-03
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2021-37973

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2021-37973coverage & exploitation statusNVD · CVE.org

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