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CVE-2021-1844 is a memory corruption vulnerability in WebKit that can lead to arbitrary code execution when maliciously crafted web content is processed. The issue was addressed through improved validation in updates for iOS, iPadOS, Safari, watchOS, and macOS Big Sur. The flaw also affected Chrome under CVE-2021-21166; exploitation against Safari users has not been established.
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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.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An Apple WebKit vulnerability patched as a result of Google TAG finding that the issue also affected WebKit; the content does not report confirmed exploitation against Safari users.
The WebKit counterpart of the vulnerability tracked in Chrome as CVE-2021-21166. Apple issued a patch, but the report states there is no evidence of exploitation against Safari 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.