Apple Multiple Products Integer Overflow or Wraparound Vulnerability
CVE-2021-30952 is an integer overflow vulnerability in Apple WebContent/WebKit processing that affects multiple Apple platforms. Apple states the issue was addressed with improved input validation and that processing maliciously crafted web content may lead to arbitrary code execution. The flaw was fixed in tvOS 15.2, macOS Monterey 12.1, Safari 15.2, iOS 15.2 and iPadOS 15.2, and watchOS 8.3. Reporting in the provided context also associates this CVE with the Coruna exploit kit under the codename "buffout," where it is described as a WebContent read/write exploit used against older iOS versions, particularly up to iOS 15.1.1.
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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
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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
32 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A WebContent RCE exploit in the Coruna exploit kit affecting older iOS versions up to the 15.2 patch boundary.
An iOS vulnerability explicitly described as exploited by Coruna exploit chains and added by CISA to the Known Exploited Vulnerabilities catalog.
A WebContent read/write exploit component used within the Coruna iOS exploit kit.
An iOS WebContent/WebKit-related vulnerability used as part of the Coruna (CryptoWaters) exploit kit, enabling read/write primitives in the browser content process.
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.