CVE-2025-60455 identifies an unsafe deserialization vulnerability in Modular Max Serve prior to version 25.6, specifically when the "--experimental-enable-kvcache-agent" feature is enabled. Unsafe deserialization occurs when untrusted data is deserialized without sufficient validation, allowing attackers to craft malicious serialized objects that, when processed, lead to arbitrary code execution. This vulnerability does not require authentication or user interaction but does require local access, meaning an attacker must have some level of access to the system to exploit it. The vulnerability is classified under CWE-502, which relates to unsafe deserialization leading to remote code execution or privilege escalation. The CVSS v3.1 base score is 8.4, reflecting high impact on confidentiality, integrity, and availability, with low attack complexity and no privileges or user interaction required. Although no public exploits have been reported yet, the presence of this vulnerability in a modular server product used in enterprise environments poses a significant risk. The lack of available patches at the time of publication necessitates immediate mitigation steps to prevent exploitation, especially in environments where the experimental feature is enabled. Attackers exploiting this vulnerability could execute arbitrary code, potentially leading to full system compromise, data theft, or service disruption.

For European organizations, this vulnerability poses a critical risk to systems running Modular Max Serve with the vulnerable feature enabled. Exploitation could lead to unauthorized code execution, resulting in data breaches, service outages, or lateral movement within networks. Sectors such as finance, healthcare, government, and critical infrastructure that rely on Modular Max Serve for data caching or server operations are particularly at risk. The ability to execute arbitrary code without authentication or user interaction increases the threat level, as attackers with local access could quickly escalate privileges or implant persistent malware. This could disrupt business operations, cause regulatory compliance violations under GDPR due to data confidentiality breaches, and damage organizational reputation. The absence of known exploits currently provides a window for proactive defense, but the high severity score suggests that exploitation could have widespread and severe consequences.

1. Immediately disable the "--experimental-enable-kvcache-agent" feature in Modular Max Serve until a patched version is available. 2. Restrict local access to systems running Modular Max Serve by enforcing strict access controls and network segmentation to limit potential attacker footholds. 3. Monitor system logs and deserialization-related processes for unusual or unauthorized activity indicative of exploitation attempts. 4. Implement application whitelisting and endpoint protection solutions capable of detecting anomalous code execution patterns. 5. Stay informed on vendor updates and apply patches promptly once released. 6. Conduct security audits and penetration testing focused on deserialization vulnerabilities within the environment. 7. Educate system administrators about the risks of enabling experimental features without thorough security evaluation. 8. Consider deploying runtime application self-protection (RASP) tools that can detect and block unsafe deserialization attempts in real time.