CVE-2021-20704: Nec Clusterpro X

Critical severity, CVSS 9.8. EPSS: 2.1% chance of exploitation in the next 30 days.

Buffer overflow vulnerability in the compatible API with previous versions CLUSTERPRO X 4.3 for Windows and earlier, EXPRESSCLUSTER X 4.3 for Windows and earlier, CLUSTERPRO X 4.3 SingleServerSafe for Windows and earlier, EXPRESSCLUSTER X 4.3 SingleServerSafe for Windows and earlier allows attacker to remote code execution via a network.

Affected products

• Nec Clusterpro X: from 1.0, up to and including 4.3
• Nec Clusterpro X Singleserversafe: from 1.0, up to and including 4.3
• Nec Expresscluster X: from 1.0, up to and including 4.3
• Nec Expresscluster X Singleserversafe: from 1.0, up to and including 4.3

Published 2021-11-03. Last modified 2026-06-17.