Vulnerability Description
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issue stems from the controller failing to properly reject certificates signed by an intermediate certificate that has been revoked via a Certificate Revocation List (CRL).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.
Related Weaknesses (CWE)
References
FAQ
What is CVE-2026-9636?
CVE-2026-9636 is a documented vulnerability. 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 controll...
How severe is CVE-2026-9636?
CVSS scoring is not yet available for CVE-2026-9636. Check NVD for updates.
Is there a patch for CVE-2026-9636?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.