# CVE-2026-75345: OpENer out-of-bounds read in unconnected explicit messaging

Source: https://junglewise.ai/threats/cve-2026-75345-opener-v2-3-0-commit-76b95cf-contains-an-out-of-bounds-read-in  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-09. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-75345 · Severity: high · CVSS 7.5 · Published 2026-10-09

OpENer is an open-source implementation of the EtherNet/IP protocol, which is used in industrial control systems and factory automation. An out-of-bounds memory read vulnerability in the unconnected explicit messaging path allows a remote attacker to crash the service, causing a denial of service to industrial equipment that depends on OpENer for communication.

Technologies: [EIPStackGroup OpENer](https://junglewise.ai/threats/technologies/opener). Vendors: [EIPStackGroup](https://junglewise.ai/threats/vendors/eipstackgroup).

## Quick answers

**Is CVE-2026-75345 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-75345 being exploited in the wild.

**How severe is CVE-2026-75345?** High severity, with a CVSS score of 7.5, published 9 October 2026.

**Which products and versions are affected?** EIPStackGroup OpENer v2.3.0 (commit 76b95cf).

**Is there a fix for CVE-2026-75345?** 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-2026-75345 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-75345?** 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

The vulnerability is an out-of-bounds read flaw in the unconnected explicit messaging code path of OpENer v2.3.0 (commit 76b95cf). A remote attacker can send a specially crafted EtherNet/IP message to trigger the read, resulting in a denial of service condition. No authentication or user interaction is required.

## Affected products

- EIPStackGroup OpENer v2.3.0 (commit 76b95cf)

## Timeline

- 2026-10-09: disclosed

## References

- [https://github.com/EIPStackGroup/OpENer/blob/76b95cf/source/src/cip/cipcommon.c](https://github.com/EIPStackGroup/OpENer/blob/76b95cf/source/src/cip/cipcommon.c)
- [https://github.com/EIPStackGroup/OpENer/blob/76b95cf/source/src/cip/cipmessagerouter.c](https://github.com/EIPStackGroup/OpENer/blob/76b95cf/source/src/cip/cipmessagerouter.c)

## Related threats

- [OpENer out-of-bounds read in EtherNet/IP ForwardOpen parser](https://junglewise.ai/threats/cve-2026-75353-opener-v2-3-commit-76b95cf-contains-an-out-of-bounds-read-in-the)
- [OpENer out-of-bounds read in ForwardOpen connection-path parser](https://junglewise.ai/threats/cve-2026-75351-opener-v2-3-commit-76b95cf-contains-an-out-of-bounds-read-in-the)
- [EIPStackGroup OpENer buffer overflow in GetAttributeList](https://junglewise.ai/threats/cve-2026-75350-eipstackgroup-opener-v2-3-master-commit-76b95cf-contains-a-buffer)
- [EIPStackGroup OpENer expired pointer dereference in EtherNet/IP CPF](https://junglewise.ai/threats/cve-2026-75347-eipstackgroup-opener-v2-3-and-master-up-to-commit-76b95cf-contain)
- [EIPStackGroup OpENer out-of-bounds read in Connection Manager](https://junglewise.ai/threats/cve-2026-75349-eipstackgroup-opener-v2-3-0-master-up-to-commit-76b95cf-contains)