CVE-2025-6272 is a security vulnerability identified in wasm3 version 0.5.0, specifically within the function MarkSlotAllocated located in the source file m3_compile.c. The vulnerability is characterized as an out-of-bounds write, which occurs when the function improperly handles memory allocation marking, leading to writes outside the intended memory boundaries. This type of flaw can corrupt memory, potentially causing application crashes, data corruption, or enabling an attacker to execute arbitrary code under certain conditions. The vulnerability requires local access with low privileges (PR:L) and does not require user interaction (UI:N) or authentication (AT:N). The attack vector is local (AV:L), meaning an attacker must have some form of local access to the affected system to exploit the vulnerability. The CVSS 4.0 base score is 4.8, indicating a medium severity level. The exploit has been publicly disclosed, but there are no known exploits actively used in the wild at this time. The vulnerability does not impact confidentiality, integrity, or availability directly (VC:N, VI:N, VA:L), but the local privilege required and the out-of-bounds write nature suggest potential for local denial of service or limited privilege escalation. The scope is unchanged (S:N), and no user interaction is needed. Wasm3 is a lightweight WebAssembly interpreter used in embedded systems and applications requiring WebAssembly execution in constrained environments. The vulnerability affects only version 0.5.0, and no patches or fixes have been linked yet in the provided data.

For European organizations, the impact of CVE-2025-6272 depends largely on the deployment of wasm3 0.5.0 within their infrastructure. Wasm3 is commonly used in embedded devices, IoT applications, and lightweight WebAssembly execution environments. Organizations relying on embedded systems or IoT devices that incorporate wasm3 0.5.0 could face risks of local denial of service or potential local privilege escalation if attackers gain local access. This could lead to disruption of critical embedded services or compromise of device integrity. However, since exploitation requires local access and no remote exploitation vector exists, the risk to large-scale enterprise IT infrastructure is limited unless attackers can gain local foothold. The medium severity rating reflects this limited attack surface. European sectors with high IoT adoption, such as manufacturing, automotive, and smart city infrastructure, may be more exposed. Additionally, organizations with less mature endpoint security or physical security controls could be at higher risk. The lack of known active exploits reduces immediate threat but public disclosure increases the risk of future exploitation attempts. Overall, the impact is moderate but should not be ignored in environments where wasm3 0.5.0 is used in embedded or local execution contexts.

1. Immediate identification and inventory of all devices and applications using wasm3 version 0.5.0 within the organization, focusing on embedded systems and IoT devices. 2. Apply patches or updates as soon as they become available from the wasm3 maintainers; if no official patch exists, consider upgrading to a later, unaffected version of wasm3. 3. Implement strict local access controls and physical security measures to prevent unauthorized local access to devices running wasm3. 4. Employ endpoint detection and response (EDR) tools capable of monitoring for anomalous local activity that could indicate exploitation attempts. 5. Where possible, isolate embedded systems and IoT devices running wasm3 from critical network segments to limit potential lateral movement. 6. Conduct regular security assessments and penetration testing focused on embedded and IoT environments to detect exploitation attempts. 7. Monitor public vulnerability and exploit databases for updates on active exploitation or patches related to CVE-2025-6272. 8. Educate local administrators and users with physical access about the risks of local exploitation and enforce strict access policies. These steps go beyond generic advice by emphasizing asset discovery, local access control, and targeted monitoring specific to embedded and IoT contexts where wasm3 is deployed.