EtherNet/IP Adapter DLL Kit (EIPA): Stack-based Buffer Overflow
CVE-2026-78012 is a critical-severity stack-based buffer overflow vulnerability in EtherNet/IP Adapter DLL Kit (EIPA) from Pyramid Solutions, with a CVSS 3.1 base score of 9.8 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected EtherNet/IP Adapter DLL Kit (EIPA) versions: v5.6.1 and earlier. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.65% chance of exploitation within 30 days, higher than 52% of scored CVEs.
Critical severity: a successful attack would have severe impact.
What to do
- Update EtherNet/IP Scanner Development Kit with CIP Security (ESDK-SECURE) to v5.6.1 or a later version.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Pyramid Solutions | EtherNet/IP Adapter DLL Kit (EIPA) | v5.6.1 and earlier | Not stated |
| Pyramid Solutions | EtherNet/IP Adapter DLL Kit with CIP Security (EIPA-SECURE) | v5.6.1 and earlier | Not stated |
| Pyramid Solutions | EtherNet/IP Adapter Development Kit (EADK) | v5.6.1 and earlier | Not stated |
| Pyramid Solutions | EtherNet/IP Adapter Development Kit with CIP Security (EADK-SECURE) | v5.6.1 and earlier | Not stated |
| Pyramid Solutions | EtherNet/IP Scanner DLL Kit (EIPS) | v5.6.1 and earlier | Not stated |
| Pyramid Solutions | EtherNet/IP Scanner DLL Kit with CIP Security (EIPS-SECURE) | v5.6.1 and earlier | Not stated |
| Pyramid Solutions | EtherNet/IP Scanner Development Kit (ESDK) | v5.6.1 and earlier | Not stated |
| Pyramid Solutions | EtherNet/IP Scanner Development Kit with CIP Security (ESDK-SECURE) | before v5.6.1 | v5.6.1 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by CNA (hq.dhs.gov).
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 4.0 | 9.3 | Critical | CNA (hq.dhs.gov) |
| CVSS 3.1 | 9.8 | Critical | CNA (hq.dhs.gov) |
Official description
An issue in the NetStaX EtherNet/IP Stack prior to v5.6.1 could allow a large Class 3 explicit-message request to exceed the application-side receive buffer without generating an error or warning. The result could be memory corruption, a device crash, or a potential remote attack vector without the originating device receiving a CIP error indicating that the request could not be processed.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Stack-based Buffer Overflow
The product writes past the end of a buffer that was allocated on the stack.
How developers prevent this class of flaw
- Use automatic buffer overflow detection mechanisms that are offered by certain compilers or compiler extensions. Examples include: the Microsoft Visual Studio /GS flag, Fedora/Red Hat FORTIFY_SOURCE GCC flag, StackGuard, and ProPolice, which provide various mechanisms including canary-based detection and range/index checking. D3-SFCV (Stack Frame Canary Validation) from D3FEND discusses canary-based detection in detail.
- Use an abstraction library to abstract away risky APIs. Not a complete solution.
- Implement and perform bounds checking on input.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Other references
Other vulnerabilities in EtherNet/IP Adapter DLL Kit (EIPA)
- 7.5 High severity
Recent Stack-based Buffer Overflow vulnerabilities
- 7.1 High severity
- 8.8 High severity
- 8.7 High severity
- 8.7 High severity
- 9.3 Critical severity
- 9.3 Critical severity
Spotted an error? Tell us.