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Rockwell Automation CompactLogix 5380 ControlLogix 5580 / 1756-EN4TR Communications Module

CVE-2026-9636

July 30, 2026 · CISA (US-CERT) · Severity: CRITICAL

View CSAF Summary Successful exploitation of this vulnerability could allow an attacker to cause a denial-of-service condition.

Key Takeaways

  • View CSAF Summary Successful exploitation of this vulnerability could allow an attacker to cause a denial-of-service.
  • The following versions of Rockwell Automation CompactLogix 5380 ControlLogix 5580 / 1756-EN4TR Communications Module.
  • This could allow a network-based attacker to establish a connection using a certificate that should be untrusted.
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