A stack-based buffer overflow has been found in NEC EXPRESSCLUSTER X that can lead to remote arbitrary code execution with full SYSTEM privileges. The Transaction Server (clptrnsv.exe) is a system service configured to utilize port 29002 by default to facilitate transactions such as sending and receiving licensing data. This vulnerability occurs during the processing of opcode 0x32 when initializing a clpexescript routine within the Transaction Server. An attacker is able to introduce crafted data into the clptrnsv service to allow for arbitrary code execution.
- Exodus Intelligence: EIP-5f2cf48c
- MITRE CVE: CVE-2021-20703
- CVSSv2 Score: 10.0
- Exodus Intelligence
- Disclosed to affected vendor: February 25th, 2021
- Disclosed to public: October 29th, 2021
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