Severity
High
Analysis Summary
An urgent cybersecurity alert has been issued over three critical Apple vulnerabilities actively exploited in the wild. The flaws CVE-2025-31277, CVE-2025-43510, and CVE-2025-43520 were added to the Known Exploited Vulnerabilities (KEV) catalog by Cybersecurity and Infrastructure Security Agency, confirming real-world attacks. Security researchers have linked these vulnerabilities to the sophisticated DarkSword iOS exploit chain, where attackers combine all three weaknesses to fully compromise targeted devices across Apple’s ecosystem.
The attack begins with CVE-2025-31277, a severe buffer overflow triggered when a device processes maliciously crafted web content. This leads to memory corruption in the web engine and allows attackers to execute initial arbitrary code with minimal user interaction. Once this foothold is established, the exploit chain advances to CVE-2025-43510, which abuses improper lock-state validation to corrupt shared memory between processes. This enables attackers to tamper with inter-process memory, bypass internal protections, and escalate privileges within the operating system.
The final stage leverages CVE-2025-43520, a critical kernel memory corruption flaw. Exploitation allows a malicious application to write directly to kernel memory or crash the system, granting attackers kernel-level control. With this access, threat actors can bypass sandbox protections, maintain persistent control, conduct surveillance, and exfiltrate sensitive data. The chained execution of these three vulnerabilities enables a complete system takeover rather than a limited breach.
The impact spans nearly the entire Apple ecosystem because the vulnerable components power core web processing and operating system functions. Affected platforms include Safari, iOS, iPadOS, macOS, watchOS, visionOS, and tvOS, putting both enterprise fleets and personal devices at risk. CISA urges immediate patching, recommending updates such as iOS 18.7.2, macOS Sequoia 15.7.2, and watchOS 26.1. Where patches are unavailable, discontinuing vulnerable systems is advised. Under Binding Operational Directive 22-01, U.S. federal civilian agencies must remediate these vulnerabilities by April 3, 2026.
Impact
- Sensitive Data Theft
- Gain Access
- Security Bypass
Indicators of Compromise
CVE
CVE-2025-31277
CVE-2025-43510
CVE-2025-43520
Remediation
- Immediately apply the latest security updates released by Apple across all devices, including iOS 18.7.2, macOS Sequoia 15.7.2, and watchOS 26.1.
- Prioritize patching internet-facing and high-value corporate devices that process untrusted web content.
- Conduct a full asset inventory to identify all vulnerable Apple devices across enterprise and personal fleets.
- Disable or restrict Safari and other web content handlers on critical systems until updates are applied.
- Enforce Mobile Device Management (MDM) policies to ensure rapid patch deployment and compliance.
- Monitor endpoints for unusual application behavior, memory manipulation activity, or privilege escalation attempts.
- Block installation of untrusted or unsigned applications to reduce risk of local exploit execution.
- Segment Apple devices within the network to prevent lateral movement if a device is compromised.
- If patches are unavailable for legacy systems, decommission or isolate the affected devices from production networks.
- Follow remediation timelines mandated by Cybersecurity and Infrastructure Security Agency under Binding Operational Directive 22-01.