VDB-388121 · CVE-2026-59693 · GCVE-0-2026-59693

Siemens Desigo PXC7 prior 01.21.233.16-7862/02.21.194.36-2715 BACnet denial of service

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.2	$0-$5k	0.41

Summaryinfo

A vulnerability classified as critical has been found in Siemens Desigo DXR2, Desigo PXC3, Desigo PXC4, Desigo PXC5.E003, Desigo PXC5.E24 and Desigo PXC7. This affects an unknown function of the component BACnet. The manipulation leads to denial of service. This vulnerability is documented as CVE-2026-59693. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Siemens Desigo DXR2, Desigo PXC3, Desigo PXC4, Desigo PXC5.E003, Desigo PXC5.E24 and Desigo PXC7 and classified as critical. This issue affects some unknown processing of the component BACnet. The manipulation with an unknown input leads to a denial of service vulnerability. Using CWE to declare the problem leads to CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. Impacted is availability. The summary by CVE is:

A vulnerability has been identified in Desigo DXR2 (All versions < V01.21.233.16-7862), Desigo PXC3 (All versions < V01.21.233.16-7862), Desigo PXC4 (All versions < V02.21.194.36-2715), Desigo PXC5.E003 (All versions < V02.21.194.36-2715), Desigo PXC5.E24 (All versions < V02.21.194.36-2715), Desigo PXC7 (All versions < V02.21.194.36-2715). The affected devices are vulnerable to a denial-of-service (DoS) vulnerability. An attacker can exploit this issue by sending a malformed BACnet packet, causing the device to stop responding to BACnet queries. Recovery requires a device reset or reboot to restore normal functionality.

The advisory is shared at cert-portal.siemens.com. The identification of this vulnerability is CVE-2026-59693 since 07/06/2026. The exploitation is known to be easy. The attack may be initiated remotely. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/11/2026). MITRE ATT&CK project uses the attack technique T1499 for this issue.

Upgrading to version 01.21.233.16-7862 or 02.21.194.36-2715 eliminates this vulnerability.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

Siemens

Name

License

commercial

Website

Vendor: https://www.siemens.com/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.2

VulDB Base Score: 6.5
VulDB Temp Score: 6.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Desigo DXR2/Desigo PXC3/Desigo PXC4/Desigo PXC5.E003/Desigo PXC5.E24/Desigo PXC7 01.21.233.16-7862/02.21.194.36-2715

Timelineinfo

07/06/2026 CVE reserved
08/11/2026 +36 days Advisory disclosed
08/11/2026 +0 days VulDB entry created
08/11/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: siemens.com

Advisory: cert-portal.siemens.com
Status: Confirmed

CVE: CVE-2026-59693 (🔒)
GCVE (CVE): GCVE-0-2026-59693
GCVE (VulDB): GCVE-100-388121

Entryinfo

Created: 08/11/2026 14:52
Changes: 08/11/2026 14:52 (53)
Complete: 🔍
Cache ID: 216::103