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CVE-2021-30633 is a use-after-free vulnerability in Google Chrome's IndexedDB implementation, fixed in Chrome 93.0.4577.82. The flaw affected Chrome prior to 93.0.4577.82 and was exploitable from a crafted HTML page after compromise of the renderer process. Available technical analysis indicates the bug was in browser-side IndexedDB transaction handling: Mojo IPC requests could still be accepted while a transaction was already commit-pending, committing, or finished. During asynchronous blob or file-system handle serialization in commit processing, a callback retained a raw pointer to an IndexedDBExternalObject stored in external_objects_. An attacker could then replace or free the referenced external object before the callback resumed, causing dereference of a dangling pointer via later processing such as set_file_system_access_token. This produced a browser-process use-after-free primitive that could be leveraged for sandbox escape.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Chrome sandbox escape vulnerability caused by a use-after-free in the IndexedDB API, triggered via Mojo IPC and used as part of a full exploit chain.
A high-severity use-after-free vulnerability in Chrome's Indexed DB API.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.