EUVD-2026-69384
GHSA-xw8p-j9mr-grph
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Remote, unauthenticated, low-complexity overflow of an EtherNet/IP stack; availability impact is clear and memory corruption supports high C/I, matching the network-facing unauthenticated profile.
Primary rating from Vendor (hq).
CVSS VectorVendor: hq
Lifecycle Timeline
2DescriptionCVE.org
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.
AnalysisAI
Silent stack-based buffer overflow in Pyramid Solutions' NetStaX EtherNet/IP Stack before v5.6.1 lets a remote attacker send an oversized Class 3 explicit-message request that overruns the application-side receive buffer without any CIP error being returned, causing memory corruption, device crash, or a potential remote code-execution path. Any industrial device embedding the affected stack for EtherNet/IP communication is exposed over the network with no authentication. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires network reachability to a device running the NetStaX EtherNet/IP Stack (prior to v5.6.1) and the ability to send a Class 3 (connected explicit-message) CIP request larger than the target's application-side receive buffer; per the CVSS vector (AV:N/AC:L/PR:N/UI:N) no authentication, user interaction, or special product configuration is required against a device exposing EtherNet/IP explicit messaging. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals are internally consistent and point to genuine high priority: the CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N with VC:H/VI:H/VA:H, base 9.3) describes remote, unauthenticated, low-complexity exploitation with high impact to confidentiality, integrity, and availability. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: v5.6.1 - upgrade the NetStaX EtherNet/IP Stack to v5.6.1 or later, which adds validation of Class 3 explicit-message request sizes; because the stack is embedded, operators must obtain updated firmware from the device manufacturer that integrates the fixed stack, so contact the device OEM for a firmware release incorporating NetStaX v5.6.1. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct an asset inventory to identify all industrial devices or controllers using Pyramid Solutions NetStaX stack and confirm their current versions; immediately implement firewall rules restricting EtherNet/IP traffic to only authorized, trusted network sources. …
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Same weakness CWE-121 – Stack-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
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