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zephyr

‭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.‬

CVE-2025-9557 is a classic buffer overflow vulnerability identified in the Zephyr real-time operating system (RTOS), which is widely used in embedded systems and Internet of Things (IoT) devices. The flaw arises from a buffer copy operation that does not verify the size of the input data, leading to an out-of-bound write. This memory corruption can enable an attacker to execute arbitrary code on the affected device or cause a crash resulting in denial of service (DoS). The vulnerability affects all versions of Zephyr, indicating a systemic issue in the codebase. According to the CVSS 3.1 vector (AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H), the attack vector is adjacent network, meaning the attacker must have network access close to the device but no privileges or user interaction are required. The impact on confidentiality and integrity is limited to low, but availability impact is high due to potential device crashes. Although no exploits are currently known in the wild, the ease of exploitation and the critical role of Zephyr in embedded environments make this a significant threat. The lack of patch links suggests that fixes may be forthcoming or in progress. The vulnerability can be leveraged to compromise device operation, potentially affecting critical infrastructure or industrial control systems that rely on Zephyr-based devices.

Detailed information about CVE-2025-9557: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') in zephyrproject-rtos Zephyr affecting zephyrpr

CVE-2025-9557: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') in zephyrproject-rtos Zephyr - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2025-9557: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') in zephyrproject-rtos Zephyr

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