Loading vulnerability…
CVE-2025-43400 is an out-of-bounds write vulnerability in Apple’s FontParser component affecting multiple Apple operating systems, including iOS, iPadOS, macOS, tvOS, visionOS, and watchOS. The flaw occurs during processing of a maliciously crafted font and was remediated through improved bounds checking. Successful triggering can cause unexpected application termination or corruption of process memory. Because the bug is a memory corruption issue in a font parsing component that may be reached when content is rendered or opened by an application or system process, exploitation may extend beyond a simple crash depending on exploit reliability and execution context.
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
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 valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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.
42 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical vulnerability affecting multiple Apple operating systems, details not specified in the content.
An out-of-bounds write vulnerability in Apple’s FontParser component that can be triggered by processing a maliciously crafted font, potentially leading to denial-of-service, memory corruption, or arbitrary code execution.
A critical out-of-bounds write vulnerability in Apple's FontParser component affecting macOS, iOS, iPadOS, and related products. Exploitation could allow arbitrary code execution via a maliciously crafted font file.
An out-of-bounds write vulnerability in Apple software where processing a maliciously crafted font may cause unexpected app termination or corrupt process memory.
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.