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CVE-2026-9636— Rockwell Automation CompactLogix® 5380 ControlLogix® 5580 / 1756-EN4 Communications Module – Certificate Revocation List Vulnerability

Quick assessment

Affected
Rockwell Automation ControlLogix® 5580, CompactLogix® 5380, GuardLogix® 5580, Compact GuardLogix® 5380, 1756-EN4TR
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Rockwell Automation CompactLogix是美国Rockwell Automation基金会的一款可编程自动化控制器。 Rockwell Automation CompactLogix存在加密问题漏洞，该漏洞源于CIP Security证书吊销处理问题，控制器未能正确拒绝由已吊销中间证书签名的证书，可能导致基于网络的攻击者使用本应不受信任的证书建立连接，绕过CIP Security保护。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.22% · P12

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle

Affected Version Matrix 1

VendorProduct Version RangeStatus
Rockwell Automation ControlLogix® 5580, CompactLogix® 5380, GuardLogix® 5580, Compact GuardLogix® 5380, 1756-EN4TR Version 36 - Version 37 affected
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I. Basic Information for CVE-2026-9636

Vulnerability Information
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Vulnerability Title
Rockwell Automation CompactLogix® 5380 ControlLogix® 5580 / 1756-EN4 Communications Module – Certificate Revocation List Vulnerability
Source: CVE Program / CVE List V5
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issue stems from the controller failing to properly reject certificates signed by an intermediate certificate that has been revoked via a Certificate Revocation List (CRL).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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
证书撤销验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Rockwell Automation CompactLogix 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Rockwell Automation CompactLogix是美国Rockwell Automation基金会的一款可编程自动化控制器。 Rockwell Automation CompactLogix存在加密问题漏洞，该漏洞源于CIP Security证书吊销处理问题，控制器未能正确拒绝由已吊销中间证书签名的证书，可能导致基于网络的攻击者使用本应不受信任的证书建立连接，绕过CIP Security保护。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Rockwell Automation ControlLogix® 5580, CompactLogix® 5380, GuardLogix® 5580, Compact GuardLogix® 5380, 1756-EN4TR Version 36 - Version 37 -

II. Public POCs for CVE-2026-9636

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III. Intelligence Information for CVE-2026-9636

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Vendor Advisories for CVE-2026-9636 (1)

Same Patch Batch · Rockwell Automation · 2026-07-14 · 17 CVEs total

CVE-2025-12011 9.2 CRITICAL CompactLogix ®, ControlLogix ®, Compact GuardLogix ® and GuardLogix ® Buffer Overflow
CVE-2026-10573 6.3 MEDIUM 1734 POINT I/OTM - Denial of Service via Malformed Inputs on CIP Object
CVE-2026-8085 Rockwell Automation Arena® - Memory Corruption Vulnerability
CVE-2026-8314 Rockwell Automation Arena® - Memory Corruption Vulnerability
CVE-2026-8313 Rockwell Automation Arena® - Memory Corruption Vulnerability
CVE-2026-9653 1756-EN2, 1756-EN3, and 1756-ENBT - Denial of Service via CIP Connection ID
CVE-2026-9140 1718-AENTR/1719-AENTR - Denial of Service
CVE-2026-10714 Rockwell Automation FactoryTalk® Services Platform FTSP - Weak Authentication via JWT Vali
CVE-2025-12012 CompactLogix ®, ControlLogix ®, Compact GuardLogix ® and GuardLogix ® Buffer Overflow
CVE-2026-11917 ThinManager® - Path Traversal via API
CVE-2026-9108 Studio 5000 Logix Designer® – Multiple Vulnerabilities
CVE-2026-9128 Studio 5000 Logix Designer® – Multiple Vulnerabilities
CVE-2026-9292 Rockwell Automation FactoryTalk® DataMosaix™ Private Cloud - Stored Cross-Site Scripting
CVE-2026-9127 Studio 5000 Logix Designer® – Multiple Vulnerabilities
CVE-2026-12659 Rockwell Automation Flex 5000® Adapter - Denial of Service
CVE-2025-11698 CompactLogix ®, ControlLogix ®, Compact GuardLogix ® and GuardLogix ® Buffer Overflow

IV. Related Vulnerabilities

Same vendor: Rockwell Automation
Same weakness: CWE-299

V. Comments for CVE-2026-9636

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