WebKit Use-After-Free in Apple Safari, iOS, iPadOS, and macOS
CVE-2023-43000 is a WebKit use-after-free vulnerability in Apple platforms. Apple describes it as a use-after-free issue addressed with improved memory management. When WebKit processes maliciously crafted web content, the stale object access can lead to memory corruption. The issue was fixed in macOS Ventura 13.5, iOS 16.6, iPadOS 16.6, Safari 16.6, and later backported to iOS 15.8.7 and iPadOS 15.8.7 for older devices. Reporting on the Coruna exploit kit identifies this flaw as the WebContent read/write stage codenamed "terrorbird" for iOS 16.2 through 16.5.1, used to achieve initial code execution in the browser renderer process.
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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
49 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.