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MBS Universal Gateway CVE-2026-35077

| EUVDEUVD-2026-34073 HIGH
External Control of File Name or Path (CWE-73)
2026-06-03 CERTVDE GHSA-c9gv-mp37-24rp
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 - 13:37 vuln.today
v3 (cvss_changed)
Analysis Updated
Jun 03, 2026 - 13:37 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 - 12:53 vuln.today

DescriptionCVE.org

The ugw-delete-file method allows a remote attacker with user privileges to delete arbitrary local files due to insufficient validation of user-controlled input.

AnalysisAI

Arbitrary file deletion in MBS Universal Gateway (UGW) product family allows authenticated remote attackers to remove any file on the device filesystem by abusing the ugw-delete-file method, which fails to validate user-controlled path input (CWE-73). With CVSS 4.0 score 7.2 and PR:L, exploitation requires only a low-privileged account, and successful abuse impacts integrity and availability of the gateway (VI:H/VA:H). …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Reach UGW management interface over network
Delivery
Authenticate with low-privileged user account
Exploit
Call ugw-delete-file with traversal path
Execution
Gateway deletes attacker-chosen file
Persist
Configuration or runtime files removed
Impact
Fieldbus conversion service disrupted
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Vulnerability AssessmentAI

Exploitation Attacker must hold a valid low-privileged user account on the targeted MBS Universal Gateway (CVSS PR:L) and must be able to reach the gateway's management interface over the network (AV:N). … 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) shows a network-reachable, low-complexity attack that needs an existing low-privileged user account and no user interaction; impact is bounded to integrity and availability of the gateway itself with no confidentiality loss and no scope/subsequent-system impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker who has obtained or been issued a low-privileged user account on an MBS UGW gateway (for example through credential reuse, a phished engineer, or a default/weak service account) sends an authenticated request to the ugw-delete-file method with a crafted path such as a parent-directory traversal pointing at configuration, certificate, or runtime files. The handler deletes the targeted file, which can corrupt the device's protocol-conversion logic and take the affected fieldbus segment (Profibus, KNX, DALI, M-Bus, etc.) offline until the gateway is reconfigured or reflashed. …
Remediation No vendor-released patched firmware version was supplied in the available data; consult VDE advisory VDE-2026-039 at https://www.certvde.com/en/advisories/VDE-2026-039/ for the authoritative fixed firmware versions per MBS gateway model and upgrade affected Single-A, Double-A, Single-X and Double-X devices accordingly. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: identify all UGW deployments in your environment and audit account privileges; implement network segmentation to restrict access to ugw-delete-file method. …

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

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CVE-2026-35077 vulnerability details – vuln.today
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