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CVE-2021-21166 is a Google Chrome vulnerability affecting the browser’s audio component prior to version 89.0.4389.72. The flaw is described as a data race in audio that can lead to heap corruption when a remote attacker induces the vulnerable code path through a crafted HTML page. Because the issue arises from improper concurrent access to shared state, successful triggering can corrupt memory in the renderer process and create conditions suitable for further exploitation, including remote code execution.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Chrome zero-day exploit observed by Google TAG and linked in this report to infrastructure believed associated with Candiru.
A Google Chrome renderer remote code execution (RCE) zero-day exploited in targeted attacks attributed to Candiru; also impacted WebKit and was patched by Apple as CVE-2021-1844.
A Chrome browser remote code execution exploit referenced as being used by Candiru for drive-by compromise via a crafted URL.
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.