CVE-2025-7976 is a high-severity remote code execution vulnerability affecting Anritsu ShockLine version 2023.7.5. The vulnerability arises from improper handling of CHX file parsing, specifically due to deserialization of untrusted data (CWE-502). When ShockLine processes a maliciously crafted CHX file, it fails to properly validate the serialized data, allowing an attacker to execute arbitrary code within the context of the ShockLine process. Exploitation requires user interaction, such as opening a malicious file or visiting a malicious webpage that triggers the parsing of the crafted CHX file. The vulnerability does not require prior authentication or elevated privileges, but the attacker must convince the user to perform the triggering action. The CVSS v3.0 score is 7.8, reflecting high impact on confidentiality, integrity, and availability, with low attack complexity but requiring user interaction. Although no public exploits are currently known, the nature of deserialization vulnerabilities and the ability to execute arbitrary code remotely make this a critical concern for organizations using this product. The vulnerability was identified and assigned by the Zero Day Initiative (ZDI) as ZDI-CAN-26882 and publicly disclosed in September 2025.

For European organizations using Anritsu ShockLine 2023.7.5, this vulnerability poses a significant risk. ShockLine is a specialized test and measurement tool used in telecommunications and network infrastructure environments. Successful exploitation could allow attackers to gain control over systems running ShockLine, potentially leading to data theft, disruption of network testing operations, or pivoting to other critical infrastructure components. The compromise of ShockLine systems could impact the integrity and availability of network diagnostics and maintenance activities, which are crucial for telecom operators and service providers. Given the high confidentiality impact, sensitive network configuration or diagnostic data could be exposed. The requirement for user interaction somewhat limits mass exploitation but targeted attacks against telecom engineers or administrators are plausible. This could be leveraged in espionage campaigns or sabotage, especially in critical national infrastructure sectors.

Organizations should immediately identify all instances of Anritsu ShockLine version 2023.7.5 in their environment and restrict access to these systems to trusted personnel only. Since no official patches are currently available, implement strict file handling policies to prevent opening untrusted CHX files. Employ network segmentation to isolate ShockLine systems from general user networks and internet access to reduce exposure. Use endpoint protection solutions capable of detecting anomalous process behavior indicative of exploitation attempts. Educate users about the risks of opening files from untrusted sources and visiting suspicious websites. Monitor logs for unusual activity related to ShockLine processes. Engage with Anritsu for updates on patches or workarounds and apply them promptly once released. Consider application whitelisting to prevent unauthorized code execution within ShockLine environments.