CVE-2025-9557 in Zephyr
Summary
by MITRE • 11/26/2025
An out-of-bound write can lead to an arbitrary code execution. Even on devices with some form of memory protection, this can still lead to a crash and a resultant denial of service.
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Analysis
by VulDB Data Team • 11/27/2025
This vulnerability represents a critical memory safety issue that manifests as an out-of-bounds write condition affecting system stability and security. The flaw occurs when a program attempts to write data beyond the allocated memory boundaries of a buffer or array, creating a scenario where adjacent memory locations can be overwritten. Such conditions are particularly dangerous because they can be exploited to execute arbitrary code, effectively allowing attackers to bypass security controls and gain unauthorized access to system resources. The vulnerability's impact extends beyond mere code execution to include potential system crashes and denial of service conditions, making it a significant concern for system reliability. According to the CWE classification system, this vulnerability maps directly to CWE-787 Out-of-bounds Write, which is categorized under the broader weakness type of buffer overflow conditions. The technical nature of this flaw means that even on systems with memory protection mechanisms such as stack canaries, address space layout randomization, or data execution prevention, the vulnerability can still be exploited to cause system instability. The operational impact of CVE-2025-9557 is severe as it provides attackers with multiple attack vectors for compromising system integrity. When exploited, the out-of-bounds write can overwrite critical program variables, return addresses, or function pointers, enabling attackers to redirect program execution flow. This type of vulnerability is particularly concerning in environments where memory protection features are present, as it demonstrates that even sophisticated defense mechanisms can be circumvented through careful exploitation of memory handling flaws. The vulnerability's potential for causing denial of service means that legitimate users may be unable to access system resources, while the arbitrary code execution capability provides attackers with persistent access to compromised systems. From an attack framework perspective, this vulnerability aligns with ATT&CK technique T1059.007 Command and Scripting Interpreter: PowerShell, as it can enable attackers to establish persistent access through code injection methods. The memory corruption aspects of this vulnerability also connect to ATT&CK technique T1203 Exploitation for Client Execution, which involves using vulnerabilities to execute malicious code on target systems. The remediation approach for this vulnerability requires comprehensive memory safety measures including bounds checking, proper input validation, and regular code reviews to identify potential buffer overflow conditions. System administrators should implement immediate patching procedures and monitor for signs of exploitation attempts. Additionally, deployment of runtime protections such as heap spraying detection and memory corruption prevention tools can provide additional layers of defense. The vulnerability underscores the importance of defensive programming practices and adherence to secure coding standards to prevent such memory safety issues from occurring in the first place.