CVE-2026-59693

BACnet service interruption via malformed packet handling

Published Aug 11, 2026 · Updated Aug 11, 2026

Denial of service in Siemens Desigo DXR2 and PXC controllers allows attackers to interrupt BACnet query processing. The BACnet request handler fails to reject a malformed packet and leaves the device unable to answer subsequent BACnet queries. Remote attackers on an adjacent BACnet network can trigger the condition, and service remains unavailable until the controller is reset or rebooted.

CVSS severity5.3
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Siemens Desigo DXR2 and PXC controllers allows attackers to interrupt BACnet query processing. The BACnet request handler fails to reject a malformed packet and leaves the device unable to answer subsequent BACnet queries. Remote attackers on an adjacent BACnet network can trigger the condition, and service remains unavailable until the controller is reset or rebooted.

The record

CVE
CVE-2026-59693
Published
Aug 11, 2026
Updated
Aug 11, 2026
Vendor
Siemens
Product
Desigo PXC5.E24
Classifications
CWE-754, T0814
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <V02.21.194.36-2715

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Siemens · Desigo PXC5.E24version=0 <V02.21.194.36-2715
Siemens · Desigo PXC3version=0 <V01.21.233.16-7862
Siemens · Desigo PXC4version=0 <V02.21.194.36-2715
Siemens · Desigo PXC7version=0 <V02.21.194.36-2715
Siemens · Desigo PXC5.E003version=0 <V02.21.194.36-2715
Siemens · Desigo DXR2version=0 <V01.21.233.16-7862

Published CVSS scores

5.3Siemens AGCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
4.3Siemens AGCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-754Improper Check for Unusual or Exceptional Conditions
T0814Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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