EUVD-2026-77238
GHSA-vvvm-mx34-h72c
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/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
Network-reachable with low privileges required; DoS-only impact with no confidentiality or integrity effect and unchanged scope.
Primary rating from Vendor (jpcert).
CVSS VectorVendor: jpcert
Lifecycle Timeline
3DescriptionCVE.org
Stack-based buffer overflow vulnerability exists in Remote I/O Coupler Unit (Server Type) CPSN-MCB271-*. Receiving a specially crafted request created and sent by a remote attacker may cause a denial-of-service (DoS) condition.
AnalysisAI
Stack-based buffer overflow in Contec Remote I/O Coupler Unit (Server Type) CPSN-MCB271-* allows an authenticated remote attacker to trigger a denial-of-service condition by sending a specially crafted network request. The overflow (CWE-121) corrupts stack memory, crashing the device firmware without evidence of code execution capability. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires authenticated network access (PR:L per CVSS 4.0 vector) to the Remote I/O Coupler Unit operating in Server Type mode. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L) scores 5.3 (Medium) and accurately captures the limited impact: availability impact is Low on the vulnerable system only, with no confidentiality or integrity impact. … 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 | Consult the Contec security advisory (contec_security_cps_26091000_en.pdf) for the official firmware update, as no specific patched version number is available in current data - patch version not independently confirmed from available references. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Credential disclosure in Contec's Remote I/O Coupler Unit (Server Type) CPSN-MCB271 enables an attacker who obtains a de
Unauthenticated REST API access on Contec's CPSN-MCB271 series Remote I/O Coupler Unit (Server Type) allows any network-
Out-of-bounds write in CONPROSYS nano Series Remote I/O Coupler Units from Contec Co., Ltd. enables remote attackers wit
Cross-site scripting in CONTEC's CONPROSYS nano Series industrial remote I/O coupler units allows an unauthenticated att
Cross-site request forgery affects a broad range of Contec industrial data loggers, flow computers, and remote I/O coupl
Plaintext credential storage in CONTEC's CONPROSYS nano Series industrial remote I/O devices exposes passwords to attack
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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