WebKit Use-After-Free in Apple Safari, iOS, iPadOS, and macOS
CVE-2023-43000 is a use-after-free vulnerability in Apple WebKit. Apple states the issue was addressed with improved memory management. When WebKit processes maliciously crafted web content, stale object references can be dereferenced after the underlying memory has been freed, leading to memory corruption. The flaw affects Apple platforms that use WebKit for web content rendering, including macOS Ventura prior to 13.5, iOS prior to 16.6, iPadOS prior to 16.6, and Safari prior to 16.6, with later backported fixes also released for iOS 15.8.7 and iPadOS 15.8.7. Reporting in the provided content further indicates the vulnerability was used as a WebKit initial-access/browser-renderer exploit in the Coruna exploit kit, where it was referred to as "terrorbird."
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
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.
Recent activity
50 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Coruna exploit chain vulnerability targeting iOS 16.2–16.5 and fixed in iOS 16.6.
A WebKit JIT type confusion vulnerability used in Coruna Stage 1 to achieve initial code execution in the browser renderer on iOS 16.2-16.5.1.
A WebContent read/write exploit component in the Coruna exploit kit for iOS devices.
A security flaw for which Apple expanded patches; the flaw was weaponized as part of the Coruna exploit kit.
The version that knows your environment.
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.