CVE-2026-35226: CWE-787 Out-of-bounds Write in CODESYS CODESYS PROFINET
CVE-2026-35226 is an out-of-bounds write vulnerability in the CODESYS PROFINET Controller version 4.4.0.0. An unauthenticated attacker on the same network segment can send malformed PROFINET data that triggers an exception in the PLC application. This exception is handled by the runtime system, causing a controlled stop of the PLC application. The vulnerability has a high severity score of 7.1 and does not require user interaction or privileges to exploit.
AI Analysis
Technical Summary
This vulnerability (CWE-787) involves an out-of-bounds write in the CODESYS PROFINET Controller 4.4.0.0. An attacker on the same network segment can send specially crafted PROFINET communication packets that cause an exception in the PLC application. The CODESYS Control runtime system handles this exception by stopping the PLC application in a controlled manner. There is no indication of code execution or privilege escalation. No patch or official remediation level has been published yet, and no known exploits are reported in the wild.
Potential Impact
Successful exploitation results in a denial-of-service condition by causing the PLC application to stop. This can disrupt industrial control processes relying on the affected PLC. There is no evidence of further impact such as arbitrary code execution or data compromise.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, network segmentation to restrict access to the PROFINET network segment and monitoring for malformed PROFINET traffic may help reduce risk.
CVE-2026-35226: CWE-787 Out-of-bounds Write in CODESYS CODESYS PROFINET
Description
CVE-2026-35226 is an out-of-bounds write vulnerability in the CODESYS PROFINET Controller version 4.4.0.0. An unauthenticated attacker on the same network segment can send malformed PROFINET data that triggers an exception in the PLC application. This exception is handled by the runtime system, causing a controlled stop of the PLC application. The vulnerability has a high severity score of 7.1 and does not require user interaction or privileges to exploit.
CVSS v4.0
Score 7.1high
Affected software
CODESYS
CODESYS PROFINET
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CWE-787) involves an out-of-bounds write in the CODESYS PROFINET Controller 4.4.0.0. An attacker on the same network segment can send specially crafted PROFINET communication packets that cause an exception in the PLC application. The CODESYS Control runtime system handles this exception by stopping the PLC application in a controlled manner. There is no indication of code execution or privilege escalation. No patch or official remediation level has been published yet, and no known exploits are reported in the wild.
Potential Impact
Successful exploitation results in a denial-of-service condition by causing the PLC application to stop. This can disrupt industrial control processes relying on the affected PLC. There is no evidence of further impact such as arbitrary code execution or data compromise.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, network segmentation to restrict access to the PROFINET network segment and monitoring for malformed PROFINET traffic may help reduce risk.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- CERTVDE
- Date Reserved
- 2026-04-01T19:54:21.499Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a69adc79c2644c7f825aa82
Added to database: 07/29/2026, 07:37:43 UTC
Last enriched: 08/05/2026, 15:02:01 UTC
Last updated: 09/12/2026, 22:01:33 UTC
Views: 71
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