Is CVE-2026-51541 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-51541 being exploited in the wild.

How severe is CVE-2026-51541?

Informational severity, with a CVSS score of 7.5, published 13 July 2026.

Which products and versions are affected?

EIPStackGroup OpENer 2.3.0 (commit 76b95cf).

Is there a fix for CVE-2026-51541?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-51541 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-51541?

Check whether you run EIPStackGroup OpENer at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-51541: EIPStackGroup OpENer out-of-bounds read in CIP message parsing

CVE-2026-51541 · Severity: info · CVSS 7.5 · Published 2026-07-13

OpENer is an open-source implementation of the EtherNet/IP industrial protocol used to facilitate communication between industrial devices. A vulnerability in how the software processes incoming messages allows a remote, unauthenticated attacker to send a specially crafted request that causes the application to crash. This results in a denial-of-service condition, potentially disrupting industrial operations and communication between networked hardware.

Technologies: EIPStackGroup OpENer. Vendors: EIPStackGroup.

Quick answers

Is CVE-2026-51541 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-51541 being exploited in the wild.
How severe is CVE-2026-51541?: Informational severity, with a CVSS score of 7.5, published 13 July 2026.
Which products and versions are affected?: EIPStackGroup OpENer 2.3.0 (commit 76b95cf).
Is there a fix for CVE-2026-51541?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-51541 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-51541?: Check whether you run EIPStackGroup OpENer at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

An out-of-bounds read vulnerability exists in OpENer 2.3.0 (commit 76b95cf) within the CIP explicit message parsing logic. The issue resides in the `DecodePaddedEPath` function in `cipcommon.c` and `CreateMessageRouterRequestStructure` in `cipmessagerouter.c`. The parser trusts an attacker-controlled `path_size` field in a malformed ENIP SendRRData frame without verifying the actual remaining length of the input buffer. An unauthenticated remote attacker can provide a forged EPath size that exceeds the available data, causing the decoder to read beyond the 512-byte stack receive buffer. This leads to a stack-buffer-overflow (as detected by AddressSanitizer) and an immediate process crash (Denial of Service).

Affected products

EIPStackGroup OpENer 2.3.0 (commit 76b95cf)

Timeline

2026-06-05: disclosed: Issue reported on GitHub by MrAlaskan
2026-07-09: advisory: Security advisory published by MrAlaskan
2026-07-13: advisory: CVE published to NVD dataset

References

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