CVE-2024-0218 Siemens CVE debrief

Who should care

Organizations operating Siemens RUGGEDCOM APE1808LNX industrial communication platforms with Nozomi Networks Guardian IDS functionality, particularly those in critical infrastructure sectors where continuous network traffic analysis is essential for security monitoring and operational visibility.

Technical summary

The vulnerability exists in the RADIUS parsing functionality of the Nozomi Networks Guardian IDS module. Improper input validation allows malformed network packets to cause the IDS module to stop updating critical network topology data (nodes, links, assets). The attack requires no authentication and can be executed remotely over the network. Recovery requires manual restart of the IDS module. The vulnerability affects Siemens RUGGEDCOM APE1808LNX industrial communication platforms running the affected Nozomi Guardian software.

Defensive priority

HIGH

Recommended defensive actions

• Upgrade Nozomi Guardian / CMC to version 23.4.1 by contacting customer support for patch and update information
• Monitor IDS module status for unexpected cessation of node, link, and asset updates
• Implement network segmentation to limit exposure of RADIUS parsing functionality to untrusted networks
• Apply defense-in-depth strategies per ICS-CERT recommended practices for industrial control systems
• Review and validate input handling in RADIUS-related network services
• Establish monitoring for malformed RADIUS packet patterns that may indicate exploitation attempts

Evidence notes

The vulnerability description indicates improper input validation in RADIUS parsing functionality as the root cause. The attack vector is network-based, requires no authentication, and results in complete loss of availability for the IDS module's core functions. The CVSS vector (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C) confirms network accessibility, low attack complexity, no privileges required, and high availability impact. The remediation specifies upgrade to V23.4.1 with customer support contact required for patch acquisition.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.