CVE-2025-40577

dcpd crash via malformed Profinet packet

Published May 13, 2025 · Updated Jul 8, 2025

Out-of-bounds read in Siemens SCALANCE LPE9403 before V4.0 HF0 allows remote attackers to crash dcpd with a crafted Profinet packet. The dcpd process fails to validate incoming Profinet packet data before reading beyond its intended bounds. The attack requires adjacent-network access to the Profinet DCP service and interrupts that process without reported data disclosure or modification.

CVSS severity5.3
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in Siemens SCALANCE LPE9403 before V4.0 HF0 allows remote attackers to crash dcpd with a crafted Profinet packet. The dcpd process fails to validate incoming Profinet packet data before reading beyond its intended bounds. The attack requires adjacent-network access to the Profinet DCP service and interrupts that process without reported data disclosure or modification.

The record

CVE
CVE-2025-40577
Published
May 13, 2025
Updated
Jul 8, 2025
Vendor
Siemens
Product
SCALANCE LPE9403
Classifications
CWE-125, T1499
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

5.3Siemens ProductCERTCVSS: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 ProductCERTCVSS: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.

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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-125Out-of-bounds Read
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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