CVE-2022-40227Network attack vector

Unauthenticated permanent DoS via crafted TCP packets

Published Oct 11, 2022 · Updated Jun 2, 2026

Improper input validation in Siemens SIMATIC HMI panels before V17 Update 4 or Update 5 allows remote attackers to cause permanent denial of service via TCP packets. Certain TCP services accept malformed input without proper validation, leaving the panel in a state that requires reboot. The attack is unauthenticated and network reachable; impact is service interruption only, with no evidence of data disclosure or modification.

CVSS severity7.5
High
EPSS probability0.84%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Siemens SIMATIC HMI panels before V17 Update 4 or Update 5 allows remote attackers to cause permanent denial of service via TCP packets. Certain TCP services accept malformed input without proper validation, leaving the panel in a state that requires reboot. The attack is unauthenticated and network reachable; impact is service interruption only, with no evidence of data disclosure or modification.

The record

CVE
CVE-2022-40227
Published
Oct 11, 2022
Updated
Jun 2, 2026
Vendor
Siemens
Product
SIMATIC HMI KTP900 Basic
Classifications
CWE-20, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 11, 2022CVE 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 < V17 Update 5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Siemens · SIMATIC HMI KTP900 Basicversion=All versions < V17 Update 5
Siemens · SIPLUS HMI KTP1200 BASICversion=All versions < V17 Update 5
Siemens · SIMATIC HMI KTP1200 Basicversion=All versions < V17 Update 5
Siemens · SIMATIC HMI KTP700 Basicversion=All versions < V17 Update 5
Siemens · SIPLUS HMI KTP900 BASICversion=All versions < V17 Update 5
Siemens · SIMATIC HMI Comfort Panelsversion=All versions < V17 Update 4
Siemens · SIPLUS HMI KTP700 BASICversion=All versions < V17 Update 5
Siemens · SIMATIC HMI KTP400 Basicversion=All versions < V17 Update 5
Siemens · SIPLUS HMI KTP400 BASICversion=All versions < V17 Update 5
Siemens · SIMATIC HMI KTP Mobile Panelsversion=All versions < V17 Update 4

Published CVSS scores

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-20Improper Input Validation
T1499Endpoint Denial 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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