EUVD-2026-40257
GHSA-4mxr-9xw9-9cr4
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
Unauthenticated network-reachable Modbus service (AV:N/AC:L/PR:N/UI:N); CWE-770 resource exhaustion yields availability-only impact, so C:N/I:N/A:H.
Primary rating from Vendor (Deltaww).
CVSS VectorVendor: Deltaww
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
Lifecycle Timeline
1DescriptionCVE.org
Delta Electronics DVP12SE PLCs are susceptible to a resource allocation vulnerability without limits or throttling (CWE-770) within their Modbus TCP service.
AnalysisAI
Resource exhaustion in Delta Electronics DVP12SE programmable logic controllers lets remote attackers crash or hang the device by overwhelming its Modbus TCP service, which lacks connection/resource throttling (CWE-770). Any host able to reach the PLC's Modbus TCP port can degrade or deny control of the affected industrial process. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires network reachability to the DVP12SE's Modbus TCP service (typically TCP port 502) and that the Modbus TCP interface is enabled, which is its standard operating mode; no authentication, credentials, or user interaction are needed (PR:N/UI:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The published CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N) correctly reflects an unauthenticated, low-complexity, network-reachable attack, but its impact metrics (VC:H/VI:H/VA:H) conflict with the underlying weakness: CWE-770 plus the 'Denial Of Service' tag point to an availability-only impact, not high confidentiality and integrity loss - verify the impact scope with the vendor advisory, as the 9.3 rating appears inflated for a resource-exhaustion DoS. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who can route to the PLC's Modbus TCP port opens or floods connections/requests faster than the device can reclaim resources, exhausting its memory or socket pool until the Modbus service stalls or the controller becomes unresponsive. Because the vector is network-based, unauthenticated, and low-complexity, this can be triggered from a compromised engineering workstation or any device with line-of-sight to the control network, halting the monitored process. … |
| Remediation | Apply the firmware update referenced in Delta advisory Delta-PCSA-2026-00011 (https://filecenter.deltaww.com/news/download/doc/Delta-PCSA-2026-00011_DVP12SE%20Multiple%20Vulnerabilities%20(CVE-2026-12818,%20CVE-2026-12819)_v1.0.pdf); the input does not contain an exact fixed version number, so confirm the patched firmware build directly from that advisory before deployment. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all DVP12SE devices and map network connectivity, particularly identifying which devices have Modbus TCP port 502 accessible from untrusted networks. …
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Same technique Denial Of Service
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External POC / Exploit Code
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