CVE-2026-12659: CWE-415 Double free in Rockwell Automation The FLEX 5000® EtherNet/IP Adapter
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.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-12659) involves a double free condition (CWE-415) in the FLEX 5000® EtherNet/IP Adapter by Rockwell Automation. The issue arises from improper handling of exceptional conditions during processing of crafted CIP packets sent to the device. Successful exploitation causes a denial-of-service condition requiring a power cycle to restore functionality. The CVSS 4.0 base score is 8.7, indicating high severity. No patch or official remediation guidance has been provided by the vendor at this time, and no known exploits are reported in the wild.
Potential Impact
The vulnerability allows an unauthenticated attacker to cause a denial-of-service by sending crafted CIP packets, resulting in the adapter becoming non-functional until power-cycled. This disrupts the availability of the affected device and any associated I/O modules relying on it.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, affected devices should be monitored for unusual network traffic and protected from untrusted sources. Power cycling the device is required to recover from an exploit-induced denial-of-service.
CVE-2026-12659: CWE-415 Double free in Rockwell Automation The FLEX 5000® EtherNet/IP Adapter
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.
CVSS v4.0
Score 8.7high
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-12659) involves a double free condition (CWE-415) in the FLEX 5000® EtherNet/IP Adapter by Rockwell Automation. The issue arises from improper handling of exceptional conditions during processing of crafted CIP packets sent to the device. Successful exploitation causes a denial-of-service condition requiring a power cycle to restore functionality. The CVSS 4.0 base score is 8.7, indicating high severity. No patch or official remediation guidance has been provided by the vendor at this time, and no known exploits are reported in the wild.
Potential Impact
The vulnerability allows an unauthenticated attacker to cause a denial-of-service by sending crafted CIP packets, resulting in the adapter becoming non-functional until power-cycled. This disrupts the availability of the affected device and any associated I/O modules relying on it.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, affected devices should be monitored for unusual network traffic and protected from untrusted sources. Power cycling the device is required to recover from an exploit-induced denial-of-service.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Rockwell
- Date Reserved
- 2026-06-18T18:54:20.493Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a565a3968715ace43c7b5b6
Added to database: 07/14/2026, 15:48:09 UTC
Last enriched: 07/14/2026, 16:18:36 UTC
Last updated: 07/14/2026, 16:47:30 UTC
Views: 3
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