CVE-2019-18336Network attack vector

Device outage via crafted PROFINET packets

Published Mar 10, 2020 · Updated Jun 2, 2026

Resource consumption in affected Siemens controllers allows remote attackers to force defect mode via crafted PROFINET packets to TCP port 102. Siemens identifies the exposed PROFINET service but has not published the packet fields or resource-handling operation that triggers defect mode. Network access to the port is sufficient without authentication or user interaction; recovery requires restarting the device.

CVSS severity7.5
High
EPSS probability1.72%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource consumption in affected Siemens controllers allows remote attackers to force defect mode via crafted PROFINET packets to TCP port 102. Siemens identifies the exposed PROFINET service but has not published the packet fields or resource-handling operation that triggers defect mode. Network access to the port is sufficient without authentication or user interaction; recovery requires restarting the device.

The record

CVE
CVE-2019-18336
Published
Mar 10, 2020
Updated
Jun 2, 2026
Vendor
Siemens
Product
SIMATIC TDC CPU555
Classifications
CWE-400, T0814
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 10, 2020CVE publishedPublication date reported by the CVE source.
  2. Jun 2, 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=All versions < V1.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Siemens · SIMATIC TDC CPU555version=All versions < V1.1.1
Siemens · SIMATIC S7-300 CPU familyversion=All versions < V3.X.17
Siemens · SINUMERIK 840D slversion=All versions < V4.8.6; version=All versions < V4.94
Siemens · SIMATIC TDC CP51M1version=All versions < V1.1.8

Published CVSS scores

7.8NVDAV:N/AC:L/Au:N/C:N/I:N/A:C
7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
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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