CVE-2025-15348 is a vulnerability classified under CWE-502 (Deserialization of Untrusted Data) affecting Anritsu ShockLine version 2025.4.2. The flaw exists in the CHX file parsing component, where the software improperly validates user-supplied data before deserialization. This lack of validation allows an attacker to craft malicious CHX files that, when processed by the vulnerable ShockLine application, lead to arbitrary code execution within the context of the running process. The vulnerability requires user interaction, such as opening a malicious file or visiting a malicious webpage that triggers the parsing of the malicious CHX file. The CVSS 3.0 vector (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) indicates local attack vector with low attack complexity, no privileges required, but user interaction is necessary. The impact on confidentiality, integrity, and availability is high, as arbitrary code execution can lead to full system compromise. No patches or exploits are currently publicly available, but the vulnerability was reported and published by the Zero Day Initiative (ZDI) under ZDI-CAN-27833. Anritsu ShockLine is a network testing tool widely used in telecommunications and industrial sectors, making this vulnerability critical for environments relying on this product for network diagnostics and maintenance.

For European organizations, the impact of this vulnerability can be significant, especially for telecom operators, industrial enterprises, and service providers using Anritsu ShockLine for network testing and diagnostics. Successful exploitation could lead to unauthorized access, data theft, disruption of network testing operations, and potential lateral movement within internal networks. This could affect the confidentiality of sensitive network data, integrity of test results, and availability of critical diagnostic tools. Given the role of ShockLine in maintaining network infrastructure, exploitation could indirectly impact broader network stability and service delivery. Organizations in sectors such as telecommunications, manufacturing, and critical infrastructure are particularly vulnerable. The requirement for user interaction limits remote exploitation but does not eliminate risk, especially in environments where files are frequently exchanged or downloaded from external sources.

To mitigate this vulnerability, European organizations should implement the following specific measures: 1) Immediately restrict the opening or processing of CHX files from untrusted or unknown sources to prevent accidental triggering of the vulnerability. 2) Implement strict file validation and scanning policies using advanced endpoint protection solutions capable of detecting malicious CHX files. 3) Educate users about the risks of opening files from untrusted sources and enforce policies to minimize user interaction with potentially malicious content. 4) Monitor network and endpoint logs for unusual activity related to ShockLine usage or unexpected process executions. 5) Coordinate with Anritsu for timely updates or patches; if no patch is available, consider isolating ShockLine systems from general user environments and limit their network access. 6) Employ application whitelisting to prevent unauthorized code execution within ShockLine’s operational context. 7) Regularly review and update incident response plans to include scenarios involving exploitation of this vulnerability.