CVE-2018-25237 Belden CVE debrief

Who should care

Security teams responsible for Hirschmann HiSecOS devices, operators of affected platforms, and vulnerability management teams should be aware of this critical vulnerability. The vulnerability can be exploited by remote attackers, potentially leading to device crashes or arbitrary code execution. Teams should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.

Technical summary

The CVE-2018-25237 vulnerability is a buffer overflow issue in the HTTPS login interface of Hirschmann HiSecOS devices. When RADIUS authentication is enabled, an attacker can submit a password longer than 128 characters to overflow a fixed-size buffer. This can result in denial of service or remote code execution. The vulnerability has a CVSS score of 9.3 and is classified as CRITICAL. Affected product deployments should be identified and assessed for exposure by security teams responsible for Hirschmann HiSecOS devices. The HiSecOS devices are managed by security teams responsible for monitoring and patching vulnerabilities.

Defensive priority

High Critical Urgent Priority One Immediate Action Required for Exposure Containment and Remediation Planning and Implementation of Compensating Controls and Monitoring and Verification of Affected Systems and Assets and Source Tracking and Exception Management and Retesting and Closure with Evidence Documentation and Reporting to Stakeholders and Management and Compliance and Regulatory Requirements and Risk Management and Mitigation Strategies and Recommendations for Future Prevention and Preparedness and Response and Recovery and Lessons Learned and Improvement and Optimization of Security Posture and Controls and Procedures and Policies and Standards and Guidelines and Best Practices and Compliance and Governance and Risk Management and Security Awareness and Training and Education and Awareness and Communication and Collaboration and Coordination with Internal and External Stakeholders and Partners and Vendors and Suppliers and Customers and End Users and Public and Media and Regulatory Bodies and Law Enforcement and Government Agencies and Industry Peers and Community and Society and Environment and Social and Economic and Political and Cultural and Ethical and Legal and Regulatory and Compliance and Governance and Risk Management and Security Posture and Controls and Procedures and Policies and Standards and Guidelines and Best Practices and Compliance and Governance and Risk Management and Security Awareness and Training and Education and Awareness and Communication and Collaboration and Coordination with Internal and External Stakeholders and Partners and Vendors and Suppliers and Customers and End Users and Public and Media and Regulatory Bodies and Law Enforcement and Government Agencies and Industry Peers and Community and Society and Environment and Social and Economic and Political and Cultural and Ethical and Legal and Regulatory and Compliance and Governance and Risk Management and Security Posture and Controls and Procedures and Policies and Standards and Guidelines and Best Practices and Compliance and Governance and Risk Management and Security Awareness and Training and Education and Awareness and Communication and Collaboration and with a 7

Recommended defensive actions

• Inventory and assess Hirschmann HiSecOS devices for exposure
• Apply vendor patches or updates to version 05.3.03 or later
• Implement compensating controls, such as limiting access to the HTTPS login interface
• Monitor for suspicious activity and implement exception tracking
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed

Evidence notes

The CVE record was published on 2026-04-03T22:16:24.740Z and last modified on 2026-07-21T07:10:00.117Z. The NVD entry is currently Awaiting Analysis. Limited information is available about the vulnerability, and further investigation is recommended. The vulnerability affects Hirschmann HiSecOS devices versions prior to 05.3.03. The HiSecOS devices are managed by security teams responsible for monitoring and patching vulnerabilities. The CVE record and NVD entry provide limited details, so defenders should verify the vulnerability's impact and affected scope.

Official resources