CVE-2025-21198: RCE in Microsoft HPC Pack

Successful exploitation of CVE-2025-21198 allows an attacker to execute arbitrary code with the privileges of the affected process. This could lead to complete system takeover, data theft, and the installation of malware. Given the HPC environment often involves sensitive data and complex computations, the impact can be severe. Attackers could leverage this vulnerability to gain persistent access, move laterally within the network, and potentially compromise other systems connected to the HPC cluster. The potential for data exfiltration and disruption of critical operations is high.

1. Reserved2024-12-05
2. Published2025-02-11
3. Modified2026-02-26
4. EPSS updated2026-04-02

The primary mitigation for CVE-2025-21198 is to upgrade Microsoft HPC Pack to version 2016.3 or later, which contains the fix. If immediate upgrade is not possible due to compatibility concerns or downtime requirements, consider isolating affected systems from external networks and implementing strict network segmentation to limit potential attack vectors. Review firewall rules to restrict access to HPC Pack services. While a direct WAF rule is unlikely, monitoring network traffic for unusual patterns associated with RCE attempts can provide early warning signs.