CVE-2025-43255 in macOS
Summary
by MITRE • 08/29/2025
An out-of-bounds read was addressed with improved bounds checking. This issue is fixed in macOS Sonoma 14.7.7, macOS Sequoia 15.6, macOS Ventura 13.7.7. An app may be able to cause unexpected system termination.
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Analysis
by VulDB Data Team • 08/29/2025
This vulnerability represents a classic out-of-bounds read flaw that could potentially lead to system instability and unexpected termination of processes. The issue manifests when an application attempts to access memory locations beyond the allocated bounds of a data structure, creating a condition where the system may crash or behave unpredictably. Such vulnerabilities are particularly concerning in operating system components where untrusted applications can trigger memory access violations that propagate to critical system functions. The fix implemented in macOS versions 14.7.7, 15.6, and 13.7.7 demonstrates Apple's proactive approach to addressing memory safety issues that could be exploited by malicious software to cause denial of service conditions.
The technical nature of this vulnerability aligns with common software security weaknesses categorized under CWE-129, which specifically addresses insufficient validation of length of input buffers. This particular flaw falls within the broader category of memory safety issues that have been extensively documented in security literature and represent one of the most prevalent classes of vulnerabilities in operating system kernels and system libraries. The out-of-bounds read condition suggests that the affected component likely performs array indexing or pointer arithmetic without adequate bounds validation, allowing an attacker to manipulate memory access patterns to trigger the vulnerability.
From an operational perspective, this vulnerability creates a significant risk for system stability and availability, as an unprivileged application can potentially cause system-wide termination events that disrupt user productivity and compromise system integrity. The impact extends beyond simple application crashes to potentially enable more sophisticated attack vectors where an attacker might leverage the instability to execute arbitrary code or escalate privileges. This type of vulnerability is particularly dangerous in enterprise environments where system reliability is paramount and unexpected termination events can lead to data loss or service disruption.
The mitigation strategy involves updating to the patched versions of macOS as specified in the advisory, which implements improved bounds checking mechanisms to prevent the out-of-bounds memory access. System administrators should prioritize deployment of these updates across all affected systems, particularly in environments where untrusted applications may be present. Additionally, organizations should implement network monitoring to detect potential exploitation attempts and maintain comprehensive incident response procedures to address any exploitation attempts that may occur before full patch deployment. The vulnerability also highlights the importance of continuous security monitoring and the need for robust input validation mechanisms in system-level components that process untrusted data from user applications.