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MBS Gateway Series CVE-2026-35084

| EUVDEUVD-2026-34080 HIGH
Stack-based Buffer Overflow (CWE-121)
2026-06-03 CERTVDE GHSA-vg85-v4gp-8v33
Buffer Overflow Stack Overflow 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
8.7
CVSS 4.0 · Vendor: CERTVDE
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Severity by source

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

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: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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

5
Analysis Updated
Jun 03, 2026 - 13:30 vuln.today
v3 (cvss_changed)
Analysis Updated
Jun 03, 2026 - 13:30 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
8.8 (HIGH) 8.7 (HIGH)
Analysis Generated
Jun 03, 2026 - 12:50 vuln.today

DescriptionCVE.org

A remote attacker with user privileges can exploit a stack buffer overflow in dali-devconfig to gain full system access as root.

AnalysisAI

Privilege escalation to root via stack buffer overflow in dali-devconfig affects MBS gateway products including Single-A, Single-X, and the Double-A/Double-X family (Profibus, X-Link, CAN, DALI, KNX, LON, M-Bus, Profinet). A remote attacker holding low-level user credentials can exploit the flaw to gain full system access, with CVSS 4.0 scoring it 8.7 (High). …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Obtain low-privilege gateway credentials
Delivery
Reach MBS management interface over network
Exploit
Send crafted input to dali-devconfig
Execution
Overflow stack buffer and hijack control flow
Persist
Execute payload as root
Impact
Pivot to fieldbus/OT network
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Vulnerability AssessmentAI

Exploitation The attacker must hold valid low-privilege user credentials on the target MBS gateway (CVSS PR:L) and must be able to reach the dali-devconfig service over the network (AV:N); no user interaction and no additional attack prerequisites are required (UI:N, AT:N), and attack complexity is low (AC:L). … 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:H/VI:H/VA:H) indicates network-reachable, low-complexity exploitation requiring only low-privilege credentials and no user interaction, producing full confidentiality, integrity, and availability impact on the vulnerable component - a profile consistent with the 8.7 High base score. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker who has obtained valid low-privilege credentials on an MBS gateway - through credential reuse, a phished engineering workstation, or an exposed default account - authenticates to the management interface and submits crafted input to dali-devconfig that overflows a stack buffer. The overflow overwrites the saved return address, redirects execution to attacker-controlled shellcode, and yields a root shell on the gateway, from which the attacker can manipulate fieldbus traffic across Profibus/Profinet/KNX/LON/DALI segments or pivot deeper into the OT network. …
Remediation Patch availability is not explicitly stated in the provided data; consult the CERT@VDE advisory at https://www.certvde.com/en/advisories/VDE-2026-039/ for the vendor-released fixed firmware version for each MBS Single-A, Single-X, Double-A, and Double-X model and upgrade to that build. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Identify and inventory all MBS gateway units (Single-A, Single-X, Double-A/Double-X models) in production and document their role in facility operations. …

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

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CVE-2026-35084 vulnerability details – vuln.today
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