CVE-2025-55232: 
vulnerability analysis and mitigation

CVE-2025-55232 is a critical remote code execution vulnerability affecting Microsoft High Performance Compute Pack (HPC). The vulnerability was discovered and disclosed on September 9, 2025. The flaw stems from deserialization of untrusted data in Microsoft HPC, which allows an unauthorized attacker to execute code over a network (NVD).

The vulnerability has been assigned a Critical severity rating with a CVSS v3.1 base score of 9.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H). The vulnerability specifically affects TCP port 5999, which is the default port for the HpcScheduler that orchestrates HPC jobs, resource management, and cluster communication (Rapid7).

If successfully exploited, this vulnerability allows an unauthorized attacker to execute arbitrary code over the network with elevated privileges. The critical CVSS score of 9.8 indicates the potential for complete compromise of system confidentiality, integrity, and availability (NVD, Hacker News).

Microsoft has released security patches to address this vulnerability. System administrators are advised to implement appropriate firewall rules, especially for TCP port 5999. The advisory sets out specific pre-requisites for the actual patch implementation (Rapid7).