CVE-2026-51541

OpENer 2.3.0 (commit 76b95cf) has an out-of-bounds read issue in CIP message parsing when handling malformed explicit requests with a forged EPath size. An attacker can send a valid ENIP SendRRData frame carrying a very short CIP payload whose path_size field claims that many more path words are present than are actually available. Because the parser trusts the attacker-controlled path_size and continues decoding path segments without a remaining-length boundary, it reads beyond the end of the stack receive buffer.

CVSS v3 9.1 CRITICAL

9.1^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://gist.github.com/MrAlaskan/705c680856e48c535148265c0899ad4b	Third Party Advisory
https://github.com/EIPStackGroup/OpENer/issues/582	Exploit Issue Tracking Vendor Advisory
https://github.com/EIPStackGroup/OpENer/issues/582	Exploit Issue Tracking Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:opener_project:opener:2.3.0:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-07-13 22:16

Updated : 2026-08-11 16:26

NVD link : CVE-2026-51541

Mitre link : CVE-2026-51541

CVE.ORG link : CVE-2026-51541

JSON object : View

Products Affected

opener_project

opener

CWE

CWE-125

Out-of-bounds Read

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