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A security issue exists in the protected mode of 1756-EN4TR and 1756-EN2TR communication modules, where a Concurrent Forward Close operation can trigger a Major Non-Recoverable (MNFR) fault. This condition may lead to unexpected system crashes and loss of device availability.

CVE-2025-8007 is a high-severity vulnerability affecting Rockwell Automation communication modules 1756-ENT2R, 1756-EN4TR, and 1756-EN4TRXT, specifically versions 6.001 or prior. The vulnerability arises from improper input validation (CWE-20) in the protected mode of the 1756-EN4TR and 1756-EN2TR modules. An attacker can exploit a Concurrent Forward Close operation to trigger a Major Non-Recoverable Fault (MNFR), causing unexpected system crashes and resulting in loss of device availability. This fault condition effectively leads to a denial-of-service (DoS) state for the affected communication modules. The CVSS 4.0 base score is 7.1, indicating a high severity level. The attack vector is adjacent network (AV:A), meaning the attacker must have access to the same local or logically adjacent network segment as the device. The vulnerability requires no privileges, no user interaction, and no authentication, making it easier to exploit in accessible environments. The impact is primarily on availability (VA:H), with no direct confidentiality or integrity impact. No known exploits are currently reported in the wild, and no patches have been linked yet. The vulnerability affects critical industrial control system (ICS) components used in automation environments, where communication modules are essential for reliable data exchange between controllers and field devices. Disruption of these modules can halt industrial processes, cause operational downtime, and potentially lead to safety risks depending on the industrial context.

Detailed information about CVE-2025-8007: CWE-20: Improper Input Validation in Rockwell Automation 1756-ENT2R, 1756-EN4TR, 1756-EN4TRXT affecting Rockwell Autom

CVE-2025-8007: CWE-20: Improper Input Validation in Rockwell Automation 1756-ENT2R, 1756-EN4TR, 1756-EN4TRXT - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2025-8007: CWE-20: Improper Input Validation in Rockwell Automation 1756-ENT2R, 1756-EN4TR, 1756-EN4TRXT

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