EUVD-2026-40246
GHSA-p26f-vx3f-455g
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Unauthenticated, low-complexity network packet (AV:N/AC:L/PR:N/UI:N) crashes the stack with availability-only impact (A:H), no confidentiality or integrity effect.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
3DescriptionCVE.org
A buffer overflow in the Get_Attribute_List function of EIPStackGroup OpENer commit 76b95c allows attackers to cause a Denial of Service (DoS) via supplying a crafted Common Packet Format (CPF) packet.
AnalysisAI
Denial of service in EIPStackGroup OpENer (commit 76b95c), an open-source EtherNet/IP stack, allows remote attackers to crash the device by sending a crafted Common Packet Format (CPF) packet that triggers a buffer overflow in the Get_Attribute_List handler. The flaw is network-reachable without authentication or user interaction (CVSS 7.5, availability-only impact), and SSVC indicates proof-of-concept exploit code exists and that exploitation is automatable. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must be able to reach the affected OpENer device's EtherNet/IP service over the network and send a crafted Common Packet Format (CPF) packet that invokes the CIP Get_Attribute_List service with a malformed attribute list - that specific service/packet path is the concrete prerequisite. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Signals are mostly consistent but point to moderate, not critical, real-world urgency. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with access to the OT network segment (or to an exposed device) sends a single crafted EtherNet/IP packet whose CPF-encapsulated Get_Attribute_List request contains a malformed length/count field, overflowing a buffer and crashing the OpENer stack - taking the PLC or industrial device offline. Because the attack is unauthenticated (PR:N), low-complexity (AC:L), and flagged automatable by SSVC, it can be scripted to sweep and disrupt many devices; SSVC indicates proof-of-concept code exists. |
| Remediation | No vendor-released patch or tagged fixed version is identified at time of analysis - the references point only to the OpENer repository and to GitHub issue #567, not to a released patch or merged commit, so remediation currently means tracking that issue for a fix and rebuilding firmware once an upstream commit lands. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all systems and applications utilizing EIPStackGroup OpENer; prioritize production ICS/SCADA deployments and critical process systems. …
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Same weakness CWE-284 – Improper Access Control
View allSame technique Authentication Bypass
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External POC / Exploit Code
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