Vulnerability Description
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 Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Opener Project | Opener | 2.3.0 |
Related Weaknesses (CWE)
References
- https://gist.github.com/MrAlaskan/705c680856e48c535148265c0899ad4bThird Party Advisory
- https://github.com/EIPStackGroup/OpENer/issues/582ExploitIssue TrackingVendor Advisory
- https://github.com/EIPStackGroup/OpENer/issues/582ExploitIssue TrackingVendor Advisory
FAQ
What is CVE-2026-51541?
CVE-2026-51541 is a vulnerability with a CVSS score of 9.1 (CRITICAL). 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 fr...
How severe is CVE-2026-51541?
CVE-2026-51541 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-51541?
Check the references section above for vendor advisories and patch information. Affected products include: Opener Project Opener.