NCSC-2026-0225

Vulnerability from csaf_ncscnl - Published: 2026-07-13 05:25 - Updated: 2026-07-13 05:25
Summary
Kwetsbaarheden verholpen in Siemens SICORE
Notes
The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this page to enhance access to its information and security advisories. The use of this security advisory is subject to the following terms and conditions: NCSC-NL makes every reasonable effort to ensure that the content of this page is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or continuous keeping up-to-date. The information contained in this security advisory is intended solely for the purpose of providing general information to professional users. No rights can be derived from the information provided therein. NCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of this security advisory. This includes damage resulting from the inaccuracy of incompleteness of the information contained in the advisory. This security advisory is subject to Dutch law. All disputes related to or arising from the use of this advisory will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings.
Feiten: Siemens heeft kwetsbaarheden verholpen in SICORE Base systemen, specifiek in versies onder V26.20.
Interpretaties: De kwetsbaarheden bevinden zich in meerdere onderdelen van de CPCI85 en SICORE Base systemen. Een kwetsbaarheid maakt het mogelijk voor een geauthenticeerde aanvaller om via een HTTP-toegankelijke debugging interface de webservice te laten crashen, wat leidt tot een denial-of-service. Daarnaast bevat de firmware update procedure een zwakte in de validatie van firmware handtekeningen, waardoor een aanvaller malafide firmware kan installeren en daarmee persistente code-uitvoering kan verkrijgen. Verder is er een configuratiefout waarbij alle OPC UA beveiligingsmechanismen standaard uitgeschakeld zijn, waardoor authenticatie en autorisatie kunnen worden omzeild en onbevoegde toegang tot kritieke systeemfuncties mogelijk is. Tot slot is er een kwetsbaarheid in de web API die onvoldoende validatie van authenticatiegegevens uitvoert bij wijzigingen aan administratieve accounts, wat een geauthenticeerde aanvaller in staat stelt om beveiligingscontroles te omzeilen en privileges te escaleren. Voor succesvol misbruik moet de kwaadwillende toegang hebben tot de productie-omgeving. Het is goed gebruik een dergelijke omgeving niet publiek toegankelijk te hebben.
Oplossingen: Siemens heeft updates uitgebracht om de kwetsbaarheden te verhelpen. Zie bijgevoegde referenties voor meer informatie.
Kans: medium
Schade: high
CWE-285: Improper Authorization
CWE-345: Insufficient Verification of Data Authenticity
CWE-400: Uncontrolled Resource Consumption
CWE-489: Active Debug Code
CWE-620: Unverified Password Change
CWE-1188: Initialization of a Resource with an Insecure Default
CVE-2026-54798

A vulnerability in CPCI85 Central Processing/Communication and SICORE Base system versions below V26.20 allows an authenticated attacker to cause denial of service by crashing the web process via an HTTP-accessible debugging interface.

6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-489 - Active Debug Code
Affected products
Product Identifier Version Remediation
vers:unknown/*
Siemens / CPCI85 Central Processing Communication, SICORE Base System
 vers:unknown/*
vers:unknown/*
Siemens / SICORE Base system
 vers:unknown/*
CVE-2026-54799

A vulnerability in the firmware update signature validation of CPCI85 Central Processing/Communication and SICORE Base systems (versions below V26.20) allows attackers to install malicious firmware, leading to persistent code execution and system compromise.

6.7 (Medium)
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
CWE-489 - Active Debug Code
Affected products
Product Identifier Version Remediation
vers:unknown/*
Siemens / CPCI85 Central Processing Communication, SICORE Base System
 vers:unknown/*
vers:unknown/*
Siemens / SICORE Base system
 vers:unknown/*
CVE-2026-54800

A vulnerability in CPCI85 Central Processing/Communication and SICORE Base systems below version V26.20 arises from default disabled OPC UA security mechanisms, allowing unauthorized access and control over critical system functions.

4.8 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
CWE-1188 - Initialization of a Resource with an Insecure Default
Affected products
Product Identifier Version Remediation
vers:unknown/*
Siemens / CPCI85 Central Processing Communication, SICORE Base System
 vers:unknown/*
vers:unknown/*
Siemens / SICORE Base system
 vers:unknown/*
CVE-2026-54801

A vulnerability in CPCI85 Central Processing/Communication and SICORE Base systems below V26.20 allows authenticated attackers to bypass security controls and gain elevated privileges due to insufficient validation of authentication credentials in the web API during administrative account modifications.

7.2 (High)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
CWE-620 - Unverified Password Change
Affected products
Product Identifier Version Remediation
vers:unknown/*
Siemens / CPCI85 Central Processing Communication, SICORE Base System
 vers:unknown/*
vers:unknown/*
Siemens / SICORE Base system
 vers:unknown/*
References
To clipboard 

{
  "document": {
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE"
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    "lang": "nl",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this page to enhance access to its information and security advisories. The use of this security advisory is subject to the following terms and conditions:\n\n    NCSC-NL makes every reasonable effort to ensure that the content of this page is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or continuous keeping up-to-date. The information contained in this security advisory is intended solely for the purpose of providing general information to professional users. No rights can be derived from the information provided therein.\n\n    NCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of this security advisory. This includes damage resulting from the inaccuracy of incompleteness of the information contained in the advisory.\n    This security advisory is subject to Dutch law. All disputes related to or arising from the use of this advisory will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings."
      },
      {
        "category": "description",
        "text": "Siemens heeft kwetsbaarheden verholpen in SICORE Base systemen, specifiek in versies onder V26.20.",
        "title": "Feiten"
      },
      {
        "category": "description",
        "text": "De kwetsbaarheden bevinden zich in meerdere onderdelen van de CPCI85 en SICORE Base systemen. Een kwetsbaarheid maakt het mogelijk voor een geauthenticeerde aanvaller om via een HTTP-toegankelijke debugging interface de webservice te laten crashen, wat leidt tot een denial-of-service. Daarnaast bevat de firmware update procedure een zwakte in de validatie van firmware handtekeningen, waardoor een aanvaller malafide firmware kan installeren en daarmee persistente code-uitvoering kan verkrijgen. Verder is er een configuratiefout waarbij alle OPC UA beveiligingsmechanismen standaard uitgeschakeld zijn, waardoor authenticatie en autorisatie kunnen worden omzeild en onbevoegde toegang tot kritieke systeemfuncties mogelijk is. Tot slot is er een kwetsbaarheid in de web API die onvoldoende validatie van authenticatiegegevens uitvoert bij wijzigingen aan administratieve accounts, wat een geauthenticeerde aanvaller in staat stelt om beveiligingscontroles te omzeilen en privileges te escaleren.\n\nVoor succesvol misbruik moet de kwaadwillende toegang hebben tot de productie-omgeving. Het is goed gebruik een dergelijke omgeving niet publiek toegankelijk te hebben.",
        "title": "Interpretaties"
      },
      {
        "category": "description",
        "text": "Siemens heeft updates uitgebracht om de kwetsbaarheden te verhelpen. Zie bijgevoegde referenties voor meer informatie.",
        "title": "Oplossingen"
      },
      {
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      {
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        "title": "CWE-285"
      },
      {
        "category": "general",
        "text": "Insufficient Verification of Data Authenticity",
        "title": "CWE-345"
      },
      {
        "category": "general",
        "text": "Uncontrolled Resource Consumption",
        "title": "CWE-400"
      },
      {
        "category": "general",
        "text": "Active Debug Code",
        "title": "CWE-489"
      },
      {
        "category": "general",
        "text": "Unverified Password Change",
        "title": "CWE-620"
      },
      {
        "category": "general",
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      }
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    "publisher": {
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      "name": "Nationaal Cyber Security Centrum",
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    },
    "references": [
      {
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        "summary": "Reference",
        "url": "https://cert-portal.siemens.com/productcert/html/ssa-229470.html"
      }
    ],
    "title": "Kwetsbaarheden verholpen in Siemens SICORE",
    "tracking": {
      "current_release_date": "2026-07-13T05:25:53.533724Z",
      "generator": {
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      ],
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  },
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          "title": "Summary"
        },
        {
          "category": "general",
          "text": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
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        },
        {
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}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.