CVE-2021-30633
Published: November 3, 2021
Official Description
Google Chromium Indexed DB API 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 could affect multiple web browsers that utilize Chromium, including, but not limited to, Google Chrome, Microsoft Edge, and Opera.
CISA KEV Advisory
Google Chromium Indexed DB API Use-After-Free Vulnerability
Google Chromium Indexed DB API 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 could affect multiple web browsers that utilize Chromium, including, but not limited to, Google Chrome, Microsoft Edge, and Opera.
Apply updates per vendor instructions.
Risk Analysis
A use-after-free vulnerability in the Google Chromium Indexed DB API allows a remote attacker, after compromising the renderer process, to potentially escape the sandbox via a crafted HTML page. The high EPSS score and confirmed exploitation by CISA indicate a critical and actively exploited vulnerability that can lead to further system compromise.
This vulnerability has been actively exploited in the wild. Exploitation requires an initial compromise of the browser's renderer process, after which a crafted HTML page can be used for sandbox escape.
Users should ensure their Chromium-based web browsers, including Google Chrome, Microsoft Edge, and Opera, are updated to the latest available versions. Regularly apply security updates to operating systems and other software.
Technical Analysis
CVE-2021-30633 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CISA has added CVE-2021-30633 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
Affected Vendors & Products
Exploit & PoC Resources
All References (1)
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-30633 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1