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MBS Universal Gateway EUVDEUVD-2026-34077

| CVE-2026-35081 HIGH
Improper Input Validation (CWE-20)
2026-06-03 CERTVDE GHSA-vwg2-pp87-3x79
Information Disclosure Single A Double A Profibus Double A X Link Single X Double X Can Double X Dali Double X Knx Double X Lon Double X M Bus Double X Profinet Double X X Link Triple X Knx Dali Triple X Knx Lon Triple X Knx M Bus Triple X Profinet Dali Triple X Profinet Knx Triple X Profinet Lon Triple X Profinet M Bus
7.2
CVSS 4.0 · Vendor: CERTVDE
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Severity by source

Vendor (CERTVDE) PRIMARY
7.2 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/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

Primary rating from Vendor (CERTVDE) · only source for this CVE.

CVSS VectorVendor: CERTVDE

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

5
Analysis Updated
Jun 03, 2026 - 13:33 vuln.today
v3 (cvss_changed)
Analysis Updated
Jun 03, 2026 - 13:33 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Jun 03, 2026 - 13:22 vuln.today
cvss_changed
CVSS changed
Jun 03, 2026 - 13:22 NVD
8.1 (HIGH) 7.2 (HIGH)
Analysis Generated
Jun 03, 2026 - 12:51 vuln.today

DescriptionCVE.org

The ugw-logstop method allows a remote attacker with user privileges to terminate arbitrary processes due to insufficient validation of user-supplied input.

AnalysisAI

Privilege escalation / denial of service in MBS Universal Gateway (UGW) product family allows an authenticated low-privileged remote user to terminate arbitrary processes on the device via the ugw-logstop method, which fails to validate user-supplied input. No public exploit identified at time of analysis, but the bug affects a broad set of MBS industrial protocol gateways (Single-A, Double-A Profibus/X-Link, Single-X, Double-X CAN/DALI/KNX/LON/M-Bus/Profinet) used in building and industrial automation. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Reach UGW management interface on OT segment
Delivery
Authenticate with low-privilege user account
Exploit
Invoke ugw-logstop with crafted process identifier
Execution
Bypass input validation in handler
Persist
Terminate critical protocol-translation daemon
Impact
Fieldbus bridge (Profibus/KNX/M-Bus/etc.) loses service
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Vulnerability AssessmentAI

Exploitation The attacker must (1) have network reachability to the UGW management interface invoking the ugw-logstop method, and (2) hold valid credentials for a low-privilege ('user') account on the device - anonymous exploitation is not described. … 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:H/VA:H) is internally consistent with the description: network reachable, low complexity, requires existing low-privilege user credentials, no user interaction, and produces high integrity and availability impact with no confidentiality loss. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker who has obtained any low-privilege user account on the UGW - for example, a contractor login on a building-automation gateway reachable from the corporate network - connects to the gateway's management interface and invokes the ugw-logstop method with a process identifier belonging to the protocol-translation daemon rather than the logger. The unvalidated input is accepted, the targeted process is killed, and the fieldbus side (Profibus, KNX, M-Bus, etc.) goes dark until the device is restarted or the daemon is brought back up, producing a sustained availability outage on the OT segment. …
Remediation No vendor-released patch version was identified at time of analysis from the supplied data; consult MBS via the CERT@VDE advisory at https://www.certvde.com/en/advisories/VDE-2026-039/ for the fixed firmware build and apply it to all listed Single-A, Single-X, Double-A and Double-X gateways. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Identify and inventory all MBS UGW deployments and document user access controls for low-privilege accounts. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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EUVD-2026-34077 vulnerability details – vuln.today
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