CVE-2026-9636
HighCVSS 8.2Summary
A vulnerability in CompactLogix 5380, ControlLogix 5580, and EN4 communication modules involves improper rejection of certificates signed by a revoked intermediate certificate. The controller fails to validate CRLs correctly, allowing an attacker to establish a connection with a certificate that should be untrusted.
Risk Assessment
The risk is the potential bypass of CIP Security protections by a network-based attacker, leading to unauthorized access to industrial controllers and possible manipulation of production processes.
Recommendation
It is recommended to immediately apply patches provided by the vendor (Rockwell Automation) for affected modules and implement monitoring of CIP Security connections to detect invalid certificates.
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Original NVD description (English source)
A security issue exists within CompactLogix® 5380, ControlLogix® 5580, and EN4 communication modules related to CIP Security certificate revocation handling. The security issue stems from the controller failing to properly reject certificates signed by an intermediate certificate that has been revoked via a Certificate Revocation List (CRL). This could allow a network-based attacker to establish a connection using a certificate that should be untrusted, potentially bypassing CIP Security protections.

