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MBS Gateways CVE-2026-35085

| EUVDEUVD-2026-34081 HIGH
Stack-based Buffer Overflow (CWE-121)
2026-06-03 CERTVDE GHSA-57rp-874r-xvf4
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 - 13:29 vuln.today
v3 (cvss_changed)
Analysis Updated
Jun 03, 2026 - 13:29 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 gdv-serverconfig to gain full system access as root.

AnalysisAI

Privilege escalation to root in MBS Single-A, Double-A, Single-X, and Double-X industrial gateway product lines allows authenticated remote attackers to corrupt stack memory in the gdv-serverconfig service and seize full system control. The flaw, reported by CERT@VDE and tracked as CVE-2026-35085 with a CVSS 4.0 score of 8.7 (High), affects multiple fieldbus variants (Profibus, Profinet, KNX, LON, DALI, M-Bus, CAN, X-Link). …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Obtain user-level gateway credentials
Delivery
Reach gdv-serverconfig over network
Exploit
Send oversized configuration payload
Execution
Overflow stack buffer and hijack return address
Persist
Execute shellcode as root
Impact
Pivot to fieldbus-connected PLCs
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Vulnerability AssessmentAI

Exploitation Exploitation requires (1) network reachability to the gdv-serverconfig service on an affected MBS Single-A, Double-A, Single-X, or Double-X gateway, and (2) valid user-level credentials on the device (CVSS PR:L) - the flaw cannot be triggered fully unauthenticated. … 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) describes a network-reachable, low-complexity flaw requiring only low-privileged credentials and no user interaction, with high confidentiality, integrity, and availability impact - a realistic priority for any operator exposing these gateways beyond a strictly segmented OT enclave. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker who has obtained valid low-privileged credentials - for example through phishing an automation engineer, reusing a shared HMI password, or pivoting from a compromised engineering workstation - connects to the gdv-serverconfig service on an MBS gateway over the OT network and submits a configuration request containing an oversized field crafted to overwrite the saved return address on the stack. Execution redirects into attacker-controlled shellcode running as root, granting full control of the gateway and the ability to manipulate Profibus/Profinet/KNX traffic to downstream PLCs and field devices. …
Remediation No vendor-released patch version is identified in the supplied data; consult the CERT@VDE advisory VDE-2026-039 at https://www.certvde.com/en/advisories/VDE-2026-039/ for the authoritative fixed firmware versions and apply them across all affected MBS Single-A, Double-A, Single-X, and Double-X variants. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Complete inventory of all affected MBS gateway models and versions in your operational technology environment; segment network access to these appliances and document current remote-access exposure. …

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

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CVE-2026-35085 vulnerability details – vuln.today
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