CVE-2026-51541
Last modified
CVE-2026-51541 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. 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. EPSS estimates a 0.38% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Opener Project | Opener | 2.3.0 |
References
- https://gist.github.com/MrAlaskan/705c680856e48c535148265c0899ad4bThird Party Advisory
- https://github.com/EIPStackGroup/OpENer/issues/582Exploit, Issue Tracking, Vendor Advisory
- https://github.com/EIPStackGroup/OpENer/issues/582Exploit, Issue Tracking, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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