EUVD-2026-43603
GHSA-7wpf-vhm2-3mpw
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Unauthenticated network-reachable ForwardOpen parser (AV:N/AC:L/PR:N/UI:N); out-of-bounds read yields memory disclosure (C:H) and crash (A:H) with no integrity impact.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Lifecycle Timeline
4DescriptionCVE.org
EIPStackGroup OpENer 2.3.0 (commit 76b95cf) has an out-of-bounds read issue in Connection Manager handling of ForwardOpen requests when processing short malformed packets. An attacker can send a valid ENIP outer frame carrying a malformed CIP ForwardOpen/LargeForwardOpen request, causing the parser to continue reading fields even when request data is insufficient. This issue is remotely triggerable via network traffic and does not require authentication.
AnalysisAI
Out-of-bounds read in the EIPStackGroup OpENer EtherNet/IP stack (version 2.3.0, commit 76b95cf) lets a remote unauthenticated attacker send a crafted ENIP frame carrying a malformed CIP ForwardOpen/LargeForwardOpen request that drives the Connection Manager parser to read past the supplied request buffer, exposing adjacent memory or crashing the stack. Per the CVSS vector (AV:N/AC:L/PR:N/UI:N) it is reachable over the network with no authentication and low complexity, yielding high confidentiality and availability impact. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires only network path to the device's EtherNet/IP listener (typically TCP 44818 / UDP 2222) and the ability to send a syntactically valid ENIP outer frame that carries a malformed/truncated CIP ForwardOpen or LargeForwardOpen request - that undersized CIP payload IS the trigger condition, causing the Connection Manager to keep reading fields past the end of the supplied request data. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Signals are only partially available: CVSS 9.1 (Critical) with AV:N/AC:L/PR:N/UI:N indicates trivial, unauthenticated network reachability, and the S:U/C:H/I:N/A:H breakdown reflects an out-of-bounds read that can both leak memory (C:H) and crash the service (A:H) without integrity impact - consistent with CWE-125. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with network reachability to an OpENer-based EtherNet/IP device (e.g., a foothold on the plant/OT LAN or an exposed device on the internet) sends a single crafted packet: a valid ENIP outer frame wrapping a deliberately short, malformed CIP ForwardOpen request. The parser reads past the truncated buffer, disclosing adjacent memory contents or crashing the device, and because no authentication is required (PR:N) and complexity is low (AC:L), the attack can be scripted and repeated for a reliable denial of service. … |
| Remediation | No vendor-released patched version was identified in the supplied data (the fix is discussed in upstream GitHub issue #564 at https://github.com/EIPStackGroup/OpENer/issues/564, but no tagged release beyond 2.3.0/commit 76b95cf is confirmed), so treat this as 'no vendor-released patch identified at time of analysis' and monitor the OpENer repository for a commit that adds length validation to ForwardOpen/LargeForwardOpen parsing, then rebuild and redeploy affected firmware once available. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: audit all systems running OpENer v2.3.0 (commit 76b95cf) and immediately segment them from untrusted networks using firewall rules to block inbound EtherNet/IP traffic on TCP/UDP 2222 and 44818. …
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Same weakness CWE-125 – Out-of-bounds Read
View allSame technique Buffer Overflow
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External POC / Exploit Code
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