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CVE-2026-9636

HIGH
8.2
CVSS 4.0
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issue stems from the controller failing to properly reject certificates signed by an intermediate certificate that has been revoked via a Certificate Revocation List (CRL).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.

Metadata

CVE ID
CVE-2026-9636
State
PUBLISHED
Assigner
Rockwell
Reserved
2026-05-26 18:10 UTC
Published
2026-07-14 15:11 UTC
Last updated
2026-07-14 15:55 UTC
Primary CWE
CWE-299
CWE-299 Improper check for certificate revocation
Vendor / Product
Rockwell Automation / ControlLogix® 5580, CompactLogix® 5380, GuardLogix® 5580, Compact GuardLogix® 5380, 1756-EN4TR
Sources
cve.org  ·  NVD

Severity & Metrics

8.2 HIGH CVSS 4.0
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
SSVC — CISA Coordinator
Exploitation
none
Automatable
no
Tech. Impact
partial
Affected products (1)
VendorProductPlatformVersions
Rockwell Automation ControlLogix® 5580, CompactLogix® 5380, GuardLogix® 5580, Compact GuardLogix® 5380, 1756-EN4TR — Version 36 - Version 37
Weakness (CWE)
CWESourceDescription
CWE-299 cna CWE-299 Improper check for certificate revocation
CVSS scores (1)
ScoreSeverityVersionSourceVector
8.2 HIGH 4.0 cna CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
References (1)
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