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React2Shell Network Security Alert

Elastic Detection Rules

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Summary
This detection rule identifies potential exploitation attempts of a critical remote code execution vulnerability, CVE-2025-55182, in React Server Components. The vulnerability allows attackers to execute arbitrary code on the server due to insecure deserialization that permits prototype chain traversal. The rule analyzes network traffic across various integrations (PANW, Cisco FTD, Fortinet Fortigate, Suricata) to spot specific attack vectors connected with this CVE. It instructs the investigation of HTTP requests and responses, checks for specific signatures related to the exploit, and includes steps for remediation should an attack be confirmed. The rule targets network security alerts reflecting exploitation attempts from the above sources, ensuring comprehensive visibility into network traffic that may indicate exposure to this critical vulnerability. A proper triage guide is provided for understanding the nature of the alert, alongside mitigation techniques to protect web applications from potential exploitation. The defined risk score of 73 and its high-severity classification underscore the urgency for organizations to configure appropriate defenses against exploitation attempts related to CVE-2025-55182.
Categories
  • Network
  • Web
  • Application
Data Sources
  • Network Traffic
  • Application Log
ATT&CK Techniques
  • T1190
  • T1059
  • T1059.007
Created: 2025-12-10