CVE-2023-27321

EIP tracks 1 public exploit for CVE-2023-27321. PoCs published by JustKhal.

AI-analyzed exploit summary This repository contains a functional exploit PoC for CVE-2023-27321, demonstrating an OPC UA authentication bypass via mismatched certificate SAN and session ApplicationUri. It includes a modular gateway setup, exploit scripts, and network isolation controls for a CDDC 2026 challenge.

OPC Foundation UA .NET Standard ConditionRefresh Resource Exhaustion Denial-of-Service Vulnerability. This vulnerability allows remote attackers to create a denial-of-service condition on affected installations of OPC Foundation UA .NET Standard. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of OPC UA ConditionRefresh requests. By sending a large number of requests, an attacker can consume all available resources on the server. An attacker can leverage this vulnerability to create a denial-of-service condition on the system. Was ZDI-CAN-20505.