Is CVE-2026-35085 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-35085 being exploited in the wild.

How severe is CVE-2026-35085?

High severity, with a CVSS score of 8.8, published 3 June 2026.

Which products and versions are affected?

MBS GmbH Universal Gateway (UGW) Firmware < V6_0_0_7.

Is there a fix for CVE-2026-35085?

A patch was published on 2026-06-03: Fixed in firmware V6_0_0_7 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-35085 attacked?

It is attacked over the network, in device firmware.

Am I affected by CVE-2026-35085?

Check whether you run MBS GmbH Universal Gateway Firmware. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-35085: MBS Universal Gateway stack buffer overflow in gdv-serverconfig

Q: Is there a fix for CVE-2026-35085?

A patch was published on 2026-06-03: Fixed in firmware V6_0_0_7 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

Q: How is CVE-2026-35085 attacked?

It is attacked over the network, in device firmware.

Q: Am I affected by CVE-2026-35085?

Check whether you run MBS GmbH Universal Gateway Firmware. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-35085 · Severity: high · CVSS 8.8 · Published 2026-06-03

MBS Universal Gateways, which connect different communication protocols in building automation systems, are vulnerable to a security flaw in their configuration interface. An attacker with basic user credentials can exploit this to take complete control of the device with administrative (root) privileges. This could lead to a total compromise of the building automation network, allowing unauthorized access to sensitive configuration data or disruption of building operations.

Technologies: MBS GmbH Universal Gateway Firmware. Vendors: MBS GmbH.

Quick answers

Is CVE-2026-35085 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-35085 being exploited in the wild.
How severe is CVE-2026-35085?: High severity, with a CVSS score of 8.8, published 3 June 2026.
Which products and versions are affected?: MBS GmbH Universal Gateway (UGW) Firmware < V6_0_0_7.
Is there a fix for CVE-2026-35085?: A patch was published on 2026-06-03: Fixed in firmware V6_0_0_7 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-35085 attacked?: It is attacked over the network, in device firmware.
Am I affected by CVE-2026-35085?: Check whether you run MBS GmbH Universal Gateway Firmware. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A stack-based buffer overflow (CWE-121) exists in the gdv-serverconfig CGI endpoint of the MBS Universal Gateway (UGW) web GUI. The vulnerability is caused by insufficient bounds checking on user-supplied input. A remote attacker with authenticated user-level privileges can exploit this flaw via network requests to execute arbitrary code with root privileges. This leads to a full system compromise, including the ability to read/delete files and cause a denial of service. The issue is fixed in firmware version V6_0_0_7.

Affected products

MBS GmbH Universal Gateway (UGW) Firmware < V6_0_0_7

Timeline

2026-06-03: disclosed
2026-06-03: advisory
2026-06-03: patched: Fixed in firmware V6_0_0_7

References

https://www.certvde.com/en/advisories/VDE-2026-039/

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