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CVE-2026-12659— Rockwell Automation Flex 5000® Adapter - Denial of Service

Quick assessment

Affected
Rockwell Automation The FLEX 5000® EtherNet/IP Adapter
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 The FLEX 5000® EtherNet/IP Adapter是美国Rockwell Automation基金会的一款用于工业自动化的网络适配器。 Rockwell Automation The FLEX 5000® EtherNet/IP Adapter 6.011版本存在资源管理错误漏洞，该漏洞源于处理特制CIP数据包时对异常情况处理不当，容易受到拒绝服务攻击，需断电重启以恢复模块及关联I/O。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.32% · P25

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
Rockwell Automation The FLEX 5000® EtherNet/IP Adapter version 6.011 affected
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I. Basic Information for CVE-2026-12659

Vulnerability Information
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Vulnerability Title
Rockwell Automation Flex 5000® Adapter - Denial of Service
Source: CVE Program / CVE List V5
Vulnerability Description
A denial-of-service security issue exists in the affected products. The security issue stems from improper handling of exceptional conditions when processing crafted CIP packets sent to the adapter. A power cycle is required to recover the module and associated I/O.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
双重释放
Source: CVE Program / CVE List V5
Vulnerability Title
Rockwell Automation The FLEX 5000® EtherNet/IP Adapter 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Rockwell Automation The FLEX 5000® EtherNet/IP Adapter是美国Rockwell Automation基金会的一款用于工业自动化的网络适配器。 Rockwell Automation The FLEX 5000® EtherNet/IP Adapter 6.011版本存在资源管理错误漏洞，该漏洞源于处理特制CIP数据包时对异常情况处理不当，容易受到拒绝服务攻击，需断电重启以恢复模块及关联I/O。
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 The FLEX 5000® EtherNet/IP Adapter version 6.011 -

II. Public POCs for CVE-2026-12659

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III. Intelligence Information for CVE-2026-12659

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Vendor Advisories for CVE-2026-12659 (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-2026-8085 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-2026-10573 1734 POINT I/OTM - Denial of Service via Malformed Inputs on CIP Object
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-2026-9636 Rockwell Automation CompactLogix® 5380 ControlLogix® 5580 / 1756-EN4 Communications Module
CVE-2026-9292 Rockwell Automation FactoryTalk® DataMosaix™ Private Cloud - Stored Cross-Site Scripting
CVE-2026-9127 Studio 5000 Logix Designer® – Multiple Vulnerabilities
CVE-2025-11698 CompactLogix ®, ControlLogix ®, Compact GuardLogix ® and GuardLogix ® Buffer Overflow

IV. Related Vulnerabilities

Same vendor: Rockwell Automation
Same weakness: CWE-415

V. Comments for CVE-2026-12659

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