EUVD-2026-43695
GHSA-w8xr-7458-qr4m
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/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 CIP packet triggers availability-only impact (A:H); no confidentiality or integrity effect, though disruption is transient and self-recovering.
Primary rating from Vendor (Rockwell).
CVSS VectorVendor: Rockwell
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/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
Lifecycle Timeline
2DescriptionCVE.org
A denial-of-service security issue exists across all the 1756-EN2, EN3, and ENBT communication module due to improper validation of CIP Implicit Connection packets. An attacker on the network can exploit this by sending crafted packets to continuously disrupt device connections, though device connections will recover immediately after.
AnalysisAI
Denial-of-service in Rockwell Automation 1756-EN2, 1756-EN3, and 1756-ENBT ControlLogix EtherNet/IP communication modules lets an unauthenticated network attacker drop active device connections by sending malformed CIP Implicit (I/O) Connection packets. Because CVSS 4.0 rates only availability impact (VC:N/VI:N/VA:H) and connections recover immediately once the traffic stops, the flaw enables repeatable disruption rather than persistent outage or code execution. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires network-layer reachability to the module's EtherNet/IP/CIP interface and the ability to send crafted CIP Implicit (connected I/O) Connection packets; no authentication, credentials, or user interaction are needed (PR:N/UI:N/AC:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor CVSS 4.0 base score is 8.7 (High), driven entirely by high availability impact (VA:H) with a fully remote, low-complexity, unauthenticated vector (AV:N/AC:L/PR:N/UI:N). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with access to the industrial network (for example, via a compromised HMI, engineering workstation, or an exposed control segment) sends a stream of crafted CIP Implicit Connection packets to a 1756-EN2/EN3/ENBT module. The malformed packets fail integrity handling and cause active I/O connections to drop, disrupting real-time communication between the controller and downstream devices for as long as the attacker sustains the traffic. … |
| Remediation | Patch available per vendor advisory: consult Rockwell Automation Security Advisory SD1780 at https://www.rockwellautomation.com/en-us/trust-center/security-advisories/advisory.SD1780.html for the corrected firmware revision, as no exact fix version is included in the provided data - apply the vendor-specified firmware update to the 1756-EN2, 1756-EN3, and 1756-ENBT modules. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all ControlLogix modules 1756-EN2, 1756-EN3, and 1756-ENBT in your environment and assess their operational criticality; implement firewall rules to restrict CIP traffic to these modules from untrusted network sources. …
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