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CVE-2026-9636

Rockwell Automation CompactLogix® 5380 ControlLogix® 5580 / 1756-EN4 Communications Module – Certificate Revocation List Vulnerability

Published: Jul 14, 2026Updated: Jul 14, 2026 Sources: CVE List NVD csafCWE-299
5.9MEDIUM
NVD MITRE
EPSS Score
0.1%
Top 96.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

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issue stems from the controller failing to properly reject certificates signed by an intermediate certificate that has been revoked via a Certificate Revocation List (CRL).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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:HI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-299

Affected Products

Rockwell Automation
commercial·USaka armorstart st, arena simulation, arena®
ControlLogix® 5580, CompactLogix® 5380, GuardLogix® 5580, Compact GuardLogix® 5380, 1756-EN4TROn-prem
ICS / OT / IoT / plc-scada-hmi

Exploitability

Official Patch Available

References

https://www.rockwellautomation.com/en-us/trust-center/security-advisories/advisory.SD1788.html
rockwellautomation.com
https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2026/icsa-26-211-05.json
raw.githubusercontent.com
https://www.cisa.gov/news-events/ics-advisories/icsa-26-211-05
cisa.gov
and 15 more references View all →

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