Rockwell Automation EN4TR modules denial of service flaws
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Two denial-of-service vulnerabilities in Rockwell Automation EN4TR communication modules can crash devices; upgrade to version 7.001 or later.
Rockwell Automation has released security updates addressing two denial-of-service vulnerabilities affecting 1756-EN4TR and 1756-EN4TRXT communication modules in versions 6.001 and prior. CVE-2025-8007 involves improper input validation where concurrent Forward Close operations trigger a Major Non-Recoverable fault, causing unexpected system crashes. CVE-2025-8008 stems from improper exception handling when specially crafted messages are sent during Forward Close operations, similarly resulting in device crashes and loss of availability.
Both vulnerabilities require local network access and carry CVSS v3 scores of 6.5 and v4 scores of 7.1. Neither is remotely exploitable, and CISA reports no known public exploitation in the wild at this time. The affected modules are deployed globally across chemical and critical manufacturing sectors. Rockwell Automation recommends immediate upgrade to version 7.001 or later, available from their website.
Defenders in affected sectors should prioritize patching these modules, as they support critical control system communications. Network segmentation and access controls remain essential in parallel with patching.
Mentioned in this report
Source reporting: https://www.cisa.gov/news-events/ics-advisories/icsa-25-226-31
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