CVE-2021-20703

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-11-03 · updated 2026-06-17
Weakness: CWE-120

Description

Buffer overflow vulnerability in the Transaction Server 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 Corporation CLUSTERPRO X: from 1.0 through 4.3
NEC Clusterpro X Singleserversafe: from 1.0 through 4.3
NEC ExpressCluster: from 1.0 through 4.3
NEC Expresscluster X Singleserversafe: from 1.0 through 4.3

References

https://jpn.nec.com/security-info/secinfo/nv21-015_en.html
https://jpn.nec.com/security-info/secinfo/nv21-015_en.html

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