CISA Warns of Exploited Apple iOS DarkSword Vulner

The Cybersecurity and Infrastructure Security Agency (CISA) has issued an urgent warning regarding three critical Apple iOS vulnerabilities. These flaws are actively exploited in the wild by threat actors, with CISA tracking the campaign under the name ‘DarkSword’.

These security flaws, officially tracked as CVE-2025-31277, CVE-2025-43510, and CVE-2025-43520, were recently added to CISA’s Known Exploited Vulnerabilities (KEV) catalog.

Security researchers have linked this specific triad of vulnerabilities to the sophisticated DarkSword iOS exploit chain, which attackers use in tandem to compromise and manipulate a wide range of Apple devices.

The DarkSword Exploit Mechanism

The DarkSword campaign relies on chaining these three distinct vulnerabilities to achieve total system compromise. The attack sequence begins with CVE-2025-31277, a severe buffer overflow vulnerability affecting multiple Apple operating systems.

This flaw occurs when the target’s device processes maliciously crafted web content, triggering immediate memory corruption within the web processing engine.

This initial entry point provides the attackers with the necessary foothold to execute preliminary arbitrary code on the victim’s device without requiring extensive user interaction.

Once initial access is established, the exploit chain leverages CVE-2025-43510 to bypass internal security boundaries.

This vulnerability stems from improper lock-state checking, leading to severe memory corruption in which a malicious application can cause unexpected changes to memory shared between processes.

By exploiting this flaw, attackers can manipulate shared memory to elevate their privileges and prepare the operating system to execute the final payload.​

The exploit chain culminates with the execution of CVE-2025-43520. This critical memory corruption issue affects the core of the operating system.

Exploiting this local vulnerability allows a malicious application to write directly to kernel memory or cause the system to terminate unexpectedly.

By gaining kernel-level write access, threat actors gain complete control over the compromised device, bypassing Apple’s native sandbox protections and enabling persistent surveillance or data exfiltration.

The scope of this vulnerability chain is exceptionally broad, affecting nearly the entire modern Apple ecosystem.

Because the underlying vulnerable components handle web content processing and fundamental kernel operations across different platforms, the threat extends far beyond just mobile phones.

The affected product list is comprehensive, encompassing Apple Safari, iOS, watchOS, visionOS, iPadOS, macOS, and tvOS.

This cross-platform impact means network defenders must aggressively assess their entire fleet of corporate and personal devices to prevent lateral movement or data breaches.

Mitigations

To counter the active exploitation of these vulnerabilities, CISA mandates that federal agencies and highly encourages private organizations to take immediate action.

System administrators must apply the latest mitigations and security updates from Apple, including iOS 18.7.2, macOS Sequoia 15.7.2, and watchOS 26.1.

If direct patches or mitigations are unavailable for specific legacy systems, CISA explicitly advises organizations to discontinue the use of the vulnerable product to prevent potential network compromise.

Under Binding Operational Directive (BOD) 22-01, federal civilian executive branch agencies have a strict deadline to remediate these vulnerabilities by April 3, 2026.

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