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CVE-2021-30661 is a use-after-free vulnerability in WebKit-based web-content processing. Processing maliciously crafted web content can trigger the memory-safety flaw and result in arbitrary code execution. The issue affected Safari and Apple operating systems, as well as WebKitGTK and WPE WebKit releases before 2.30.0. Reports indicated that the vulnerability may have been actively exploited.
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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 vulnerability covered by the Rocky Linux 8 CIQ crlsa-2021_1586 update. The content explicitly identifies available exploits and CISA Known Exploited Vulnerability status.
Actively exploited use-after-free vulnerability enabling arbitrary code execution in WebKitGTK and WPE WebKit before 2.30.0.
A previously patched WebKit zero-day affecting multiple Apple platforms, mentioned as background.
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.