NEC EXPRESSCLUSTER X Web Manager Command Execution Vulnerability


A remote command execution vulnerability has been found in NEC EXPRESSCLUSTER X. WebManager (clpwebmc.exe) is a webserver tasked with providing remote administrative access, it is configured to utilize port 29003 by default. This vulnerability occurs due to a command injection vulnerability in “LogCollect.js”. An attacker is able to specify arbitrary commands that will be executed in the context of SYSTEM.

Vulnerability Identifiers

  • Exodus Intelligence: EIP-9eccc486
  • MITRE CVE: CVE-2021-20706

Vulnerability Metrics

  • CVSSv2 Score: 10.0

Vendor References

Discovery Credit

  • Exodus Intelligence

Disclosure Timeline

  • Disclosed to affected vendor: February 25th, 2021
  • Disclosed to public: October 29th, 2021

Further Information

Readers of this advisory who are interested in receiving further details around the vulnerability, mitigations, detection guidance, and more can contact us at

Researchers who are interested in monetizing their 0Day and NDay can work with us through our Research Sponsorship Program.