CVE-2026-54429

Application outage via unbounded multicast allocation

Published Jul 14, 2026 · Updated Jul 14, 2026

Resource exhaustion in all versions of Siemens SIMATIC S7-PLCSIM Advanced allows remote attackers to make the application inaccessible. The external communication path accepts high-volume multicast traffic without limiting memory allocation, exhausting the application's available memory. Exploitation requires an active project configuration and local-network access; the application then requires a manual restart, but project data remains intact.

CVSS severity7.4
High
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

Resource exhaustion in all versions of Siemens SIMATIC S7-PLCSIM Advanced allows remote attackers to make the application inaccessible. The external communication path accepts high-volume multicast traffic without limiting memory allocation, exhausting the application's available memory. Exploitation requires an active project configuration and local-network access; the application then requires a manual restart, but project data remains intact.

The record

CVE
CVE-2026-54429
Published
Jul 14, 2026
Updated
Jul 14, 2026
Vendor
Siemens
Product
SIMATIC S7-PLCSIM Advanced
Classifications
CWE-770, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 14, 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?

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  1. Affected versionversion=0 <*

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Siemens · SIMATIC S7-PLCSIM Advancedversion=0 <*

Published CVSS scores

7.4SiemensCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
6.0SiemensCVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA: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-770Allocation of Resources Without Limits or Throttling
T1499.004Application or System Exploitation

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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