CVE-2025-40575

DCP service crash via malformed Profinet packet

Published May 13, 2025 · Updated Jul 8, 2025

Use of an uninitialized variable in Siemens SCALANCE LPE9403 before V4.0 HF0 allows remote attackers to crash dcpd via Profinet. The dcpd process fails to validate a specially crafted Profinet packet before using an uninitialized variable. The unauthenticated attack requires access to the same local network segment and interrupts the DCP service by crashing its process.

CVSS severity5.3
Medium
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use of an uninitialized variable in Siemens SCALANCE LPE9403 before V4.0 HF0 allows remote attackers to crash dcpd via Profinet. The dcpd process fails to validate a specially crafted Profinet packet before using an uninitialized variable. The unauthenticated attack requires access to the same local network segment and interrupts the DCP service by crashing its process.

The record

CVE
CVE-2025-40575
Published
May 13, 2025
Updated
Jul 8, 2025
Vendor
Siemens
Product
SCALANCE LPE9403
Classifications
CWE-457, T0814
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 13, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 8, 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=0 <V4.0 HF0

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Siemens · SCALANCE LPE9403version=0 <V4.0 HF0

Published CVSS scores

5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
4.3Siemens AGCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
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

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.

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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-457Use of Uninitialized Variable
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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