# Siemens SENTRON 3NA COM Fuse DoS Flaw

Published: 2026-10-22 · Severity: routine · Sectors: Manufacturing, Transportation, Energy, Healthcare, Financial Services, Government (National)
Canonical: https://vorant.io/reports/0c516487-19b5-5b39-ab05-7e3f4400992d/siemens-sentron-3na-com-fuse-dos-flaw

> A CVSS 5.8 flaw in Siemens SENTRON 3NA COM Fuse lets attackers trigger denial-of-service via malformed network management messages, no exploitation reported.

CISA republished a Siemens ProductCERT advisory describing a denial-of-service vulnerability in SENTRON 3NA COM Fuse devices with firmware versions below 5.2. The flaw stems from improper verification of the source of a communication channel, allowing an attacker who can reach the device over the network to send a malformed network management message that triggers a DoS condition. Recovery may require the affected network to be re-established to restore normal operation, indicating the impact could persist beyond a simple reboot.

The vulnerability (CVE-2024-7322) carries a CVSS v3 score of 5.8 and affects critical infrastructure sectors including Critical Manufacturing, Transportation, Energy, Healthcare, Financial Services, and Government Facilities, with deployments worldwide. There is no indication of active exploitation in the wild; this is a vendor-disclosed vulnerability reported by Siemens ProductCERT. CISA and Siemens recommend standard ICS network hardening: minimizing network exposure of control system devices, isolating control networks behind firewalls, and using VPNs for any required remote access, following Siemens' operational guidelines for Industrial Security.

## Mentioned in this report

- Vulnerabilities: CVE-2024-7322

Source reporting: https://www.cisa.gov/news-events/ics-advisories/icsa-26-295-05

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