CVE-2022-43723Network attack vector

Application crash via malformed s7ontcp.dll parameter

Published Dec 13, 2022 · Updated Apr 22, 2025

Improper input validation in Siemens SICAM PAS/PQS before 8.06 allows remote attackers to crash the application with crafted messages. The s7ontcp.dll library accepts a certain message parameter without validating that it has the required type, and the invalid value terminates the application. No authentication or user interaction is required; Siemens has not disclosed the parameter or message format, and the demonstrated consequence is a service crash.

CVSS severity7.5
High
EPSS probability0.92%
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 SICAM PAS/PQS before 8.06 allows remote attackers to crash the application with crafted messages. The s7ontcp.dll library accepts a certain message parameter without validating that it has the required type, and the invalid value terminates the application. No authentication or user interaction is required; Siemens has not disclosed the parameter or message format, and the demonstrated consequence is a service crash.

The record

CVE
CVE-2022-43723
Published
Dec 13, 2022
Updated
Apr 22, 2025
Vendor
Siemens
Product
SICAM PAS/PQS
Classifications
CWE-20, CWE-1287, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 13, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 22, 2025Record 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 >= 7.0 < V8.06
  2. Affected versionversion=All versions < V7.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Siemens · SICAM PAS/PQSversion=All versions >= 7.0 < V8.06; version=All versions < V7.0

Published CVSS scores

7.5CISA-ADPCVSS: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
CWE-1287Improper Validation of Specified Type of Input
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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