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CVE-2021-37973 is a use-after-free vulnerability in the Portals component of Google Chrome affecting versions prior to 94.0.4606.61. The flaw can be triggered through a crafted HTML page and results from incorrect lifetime management of an object in the Portals feature, allowing memory to be reused after it has been freed. In observed exploitation, the vulnerability was used after compromise of the renderer process as part of a Chrome sandbox escape chain.
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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.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A use-after-free vulnerability in Portals in Google Chrome, exploited by Predator spyware.
One of five zero-day vulnerabilities reportedly exploited in an exploit chain to deliver the ALIEN implant; affects Google Chrome.
A Chrome zero-day used as part of a Predator spyware exploit chain in targeted attacks against Android users.
A Chrome zero-day use-after-free vulnerability in the Portals API used as part of an exploit chain against Android users.
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.