Vulnerability Details 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.004
EPSS Ranking 35.4%
CVSS Severity
CVSS v3 Score 9.1
References
Products affected by CVE-2026-51541
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cpe:2.3:a:opener_project:opener:2.3.0