HighCVE-2022-25622

    Siemens SIMATIC CFU DIQ: Uncontrolled Resource Consumption (CVE-2022-25622)

    Published Sources: Siemens ProductCERT, CVE.org

    What is affected, what to do

    The PROFINET (PNIO) stack, when integrated with the Interniche IP stack, improperly handles internal resources for TCP segments where the minimum TCP-Header length is less than defined. This could allow an attacker to create a denial of service condition for TCP services on affected devices by sending specially crafted TCP segments.

    The available sources name no fixed version. Check the vendor guidance in the references below.

    Affected
    • Siemens SIMATIC ET 200AL IM 157-1 PN eq All versions..All versions
    • Siemens SIMATIC ET 200MP IM 155-5 PN HF gte V4.2.0..*
    • Siemens SIMATIC ET 200pro IM 154-8 PN/DP CPU eq All versions < V3.2.19..All versions < V3.2.19
    • Siemens SIMATIC ET 200pro IM 154-8F PN/DP CPU eq All versions < V3.2.19..All versions < V3.2.19
    • Siemens SIMATIC ET 200pro IM 154-8FX PN/DP CPU eq All versions < V3.2.19..All versions < V3.2.19
    • Siemens SIMATIC ET 200S IM 151-8 PN/DP CPU eq All versions < V3.2.19..All versions < V3.2.19
    • Siemens SIMATIC ET 200S IM 151-8F PN/DP CPU eq All versions < V3.2.19..All versions < V3.2.19
    • Siemens SIMATIC ET 200SP IM 155-6 PN HA (incl. SIPLUS variants) eq All versions..All versions
    • Siemens SIMATIC ET 200SP IM 155-6 PN HF gte V4.2.0..*
    • Siemens SIMATIC ET 200SP IM 155-6 PN/2 HF gte V4.2.0..*
    • Siemens SIMATIC ET 200SP IM 155-6 PN/3 HF gte V4.2.0..*
    • Siemens SIMATIC ET200ecoPN, AI 8xRTD/TC, M12-L gte V5.1.1..*
    • Siemens SIMATIC ET200ecoPN, CM 4x IO-Link, M12-L gte V5.1.1..*
    • Siemens SIMATIC ET200ecoPN, CM 8x IO-Link, M12-L gte V5.1.1..*
    • Siemens SIMATIC ET200ecoPN, DI 16x24VDC, M12-L gte V5.1.1..*
    • Siemens SIMATIC ET200ecoPN, DI 8x24VDC, M12-L gte V5.1.1..*
    • Siemens SIMATIC ET200ecoPN, DIQ 16x24VDC/2A, M12-L gte V5.1.1..*
    • Siemens SIMATIC ET200ecoPN, DQ 8x24VDC/0,5A, M12-L gte V5.1.1..*
    • Siemens SIMATIC ET200ecoPN, DQ 8x24VDC/2A, M12-L gte V5.1.1..*
    • Siemens SIMATIC PN/MF Coupler eq All versions..All versions
    • Siemens SIMATIC PN/PN Coupler eq All versions >= 4.2..All versions >= 4.2
    • Siemens SIMATIC S7-1500 CPU family (incl. related ET200 CPUs and SIPLUS variants) eq All versions < V2.0.0..All versions < V2.0.0
    • Siemens SIMATIC S7-300 CPU 314C-2 PN/DP eq All versions < V3.3.19..All versions < V3.3.19
    • Siemens SIMATIC S7-300 CPU 315-2 PN/DP eq All versions < V3.2.19..All versions < V3.2.19
    • Siemens SIMATIC S7-300 CPU 315F-2 PN/DP eq All versions < V3.2.19..All versions < V3.2.19
    • Siemens SIMATIC S7-300 CPU 315T-3 PN/DP eq All versions < V3.2.19..All versions < V3.2.19
    • Siemens SIMATIC S7-300 CPU 317-2 PN/DP eq All versions < V3.2.19..All versions < V3.2.19
    • Siemens SIMATIC S7-300 CPU 317F-2 PN/DP eq All versions < V3.2.19..All versions < V3.2.19
    • Siemens SIMATIC S7-300 CPU 317T-3 PN/DP eq All versions < V3.2.19..All versions < V3.2.19
    • Siemens SIMATIC S7-300 CPU 317TF-3 PN/DP eq All versions < V3.2.19..All versions < V3.2.19
    • Siemens SIMATIC S7-300 CPU 319-3 PN/DP eq All versions < V3.2.19..All versions < V3.2.19
    • Siemens SIMATIC S7-300 CPU 319F-3 PN/DP eq All versions < V3.2.19..All versions < V3.2.19
    • Siemens SIMATIC S7-410 V10 CPU family (incl. SIPLUS variants) eq All versions < V10.1.1..All versions < V10.1.1
    • Siemens SIMATIC WinAC RTX 2010 eq All versions..All versions
    • Siemens SIMATIC WinAC RTX F 2010 eq All versions..All versions
    • Siemens SIPLUS ET 200MP IM 155-5 PN HF gte V4.2.0..*
    • Siemens SIPLUS ET 200MP IM 155-5 PN HF T1 RAIL gte V4.2.0..*
    • Siemens SIPLUS ET 200S IM 151-8 PN/DP CPU eq All versions < V3.2.19..All versions < V3.2.19
    • Siemens SIPLUS ET 200S IM 151-8F PN/DP CPU eq All versions < V3.2.19..All versions < V3.2.19
    • Siemens SIPLUS ET 200SP IM 155-6 PN HF gte V4.2.0..*
    • Siemens SIPLUS ET 200SP IM 155-6 PN HF T1 RAIL gte V4.2.0..*
    • Siemens SIPLUS ET 200SP IM 155-6 PN HF TX RAIL gte V4.2.0..*
    • Siemens SIPLUS HCS4200 CIM4210 eq All versions..All versions
    • Siemens SIPLUS HCS4200 CIM4210C eq All versions..All versions
    • Siemens SIPLUS HCS4300 CIM4310 eq All versions..All versions
    • Siemens SIPLUS NET PN/PN Coupler eq All versions >= 4.2..All versions >= 4.2
    • Siemens SIPLUS S7-300 CPU 314C-2 PN/DP eq All versions < V3.3.19..All versions < V3.3.19
    • Siemens SIPLUS S7-300 CPU 315-2 PN/DP eq All versions < V3.2.19..All versions < V3.2.19
    • Siemens SIPLUS S7-300 CPU 315F-2 PN/DP eq All versions < V3.2.19..All versions < V3.2.19
    • Siemens SIPLUS S7-300 CPU 317-2 PN/DP eq All versions < V3.2.19..All versions < V3.2.19
    • Siemens SIPLUS S7-300 CPU 317F-2 PN/DP eq All versions < V3.2.19..All versions < V3.2.19

    Not sure whether and how you are affected? Ask a question about this vulnerability

    Metrics

    7.5

    Priority

    XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.

    Source: NVD, CVSS v3

    5.3

    CVSS v3

    Severity Medium on the scale from 0 to 10.

    Source: Siemens ProductCERT, CVE.org

    0.9 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 59.6

    Show all metrics
    Severity
    High
    Priority (0–325)

    The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first?

    Read in glossary
    55.61 Methodology
    Exploit maturity

    An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack.

    Read in glossary
    no public PoC known
    XIEM Effective CVSS

    XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command.

    Read in glossary
    7.5 Methodology
    CVSS v3

    CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions.

    Read in glossary
    5.3
    EPSS score

    The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“.

    Read in glossary
    0.9 %
    Low — model estimates < 1% exploitation likelihood.
    EPSS percentile

    The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking.

    Read in glossary
    59.6
    High — this CVE ranks above the median of all CVEs scored today (rank ≥ 36%).
    KEV status

    The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.

    Read in glossary
    —
    Published
    CISA assessment (SSVC)
    Exploitation: none known · automatable · Technical impact: partial
    Source: CISA Vulnrichment, as of 18 April 2025
    CWE

    CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect.

    Read in glossary
    CWE-400

    Detection rules

    No NEOSEC detection rule is available for this vulnerability yet.

    Classification under NIS2 and CRA

    Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

    NIS2

    NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.

    Read in glossary
    High technical severity: assess and remediate the vulnerability in vulnerability handling under Art. 21(2)(e) NIS2 and document the decision.
    CRA

    The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.

    Read in glossary
    From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
    ISO/IEC 27001

    ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.

    Read in glossary
    Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

    Description

    The PROFINET (PNIO) stack, when integrated with the Interniche IP stack, improperly handles internal resources for TCP segments where the minimum TCP-Header length is less than defined. This could allow an attacker to create a denial of service condition for TCP services on affected devices by sending specially crafted TCP segments.

    Source: siemens_advisory, NVD (NIST), cvelistv5

    Affected products

    The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

    Affected products
    Affected versionsFixed in
    SiemensSIMATIC CFU DIQ
    • —
    • —
    SiemensSIMATIC CFU PA
    • —
    • —
    SiemensSIMATIC ET 200AL IM 157-1 PN
    • All versions
    • —
    SiemensSIMATIC ET 200MP IM 155-5 PN HF
    • ≥ V4.2.0
    • —
    SiemensSIMATIC ET 200pro IM 154-8 PN/DP CPU
    • All versions < V3.2.19
    • —
    SiemensSIMATIC ET 200pro IM 154-8F PN/DP CPU
    • All versions < V3.2.19
    • —
    SiemensSIMATIC ET 200pro IM 154-8FX PN/DP CPU
    • All versions < V3.2.19
    • —
    SiemensSIMATIC ET 200S IM 151-8 PN/DP CPU
    • All versions < V3.2.19
    • —
    SiemensSIMATIC ET 200S IM 151-8F PN/DP CPU
    • All versions < V3.2.19
    • —
    SiemensSIMATIC ET 200SP IM 155-6 MF HF
    • —
    • —
    SiemensSIMATIC ET 200SP IM 155-6 PN HA (incl. SIPLUS variants)
    • All versions
    • —
    SiemensSIMATIC ET 200SP IM 155-6 PN HF
    • ≥ V4.2.0
    • —
    SiemensSIMATIC ET 200SP IM 155-6 PN/2 HF
    • ≥ V4.2.0
    • —
    SiemensSIMATIC ET 200SP IM 155-6 PN/3 HF
    • ≥ V4.2.0
    • —
    SiemensSIMATIC ET200ecoPN, AI 8xRTD/TC, M12-L
    • ≥ V5.1.1
    • —
    SiemensSIMATIC ET200ecoPN, CM 4x IO-Link, M12-L
    • ≥ V5.1.1
    • —
    SiemensSIMATIC ET200ecoPN, CM 8x IO-Link, M12-L
    • ≥ V5.1.1
    • —
    SiemensSIMATIC ET200ecoPN, DI 16x24VDC, M12-L
    • ≥ V5.1.1
    • —
    SiemensSIMATIC ET200ecoPN, DI 8x24VDC, M12-L
    • ≥ V5.1.1
    • —
    SiemensSIMATIC ET200ecoPN, DIQ 16x24VDC/2A, M12-L
    • ≥ V5.1.1
    • —
    SiemensSIMATIC ET200ecoPN, DQ 8x24VDC/0,5A, M12-L
    • ≥ V5.1.1
    • —
    SiemensSIMATIC ET200ecoPN, DQ 8x24VDC/2A, M12-L
    • ≥ V5.1.1
    • —
    SiemensSIMATIC PN/MF Coupler
    • All versions
    • —
    SiemensSIMATIC PN/PN Coupler
    • All versions >= 4.2
    • —
    SiemensSIMATIC S7-1500 CPU family (incl. related ET200 CPUs and SIPLUS variants)
    • All versions < V2.0.0
    • —
    SiemensSIMATIC S7-300 CPU 314C-2 PN/DP
    • All versions < V3.3.19
    • —
    SiemensSIMATIC S7-300 CPU 315-2 PN/DP
    • All versions < V3.2.19
    • —
    SiemensSIMATIC S7-300 CPU 315F-2 PN/DP
    • All versions < V3.2.19
    • —
    SiemensSIMATIC S7-300 CPU 315T-3 PN/DP
    • All versions < V3.2.19
    • —
    SiemensSIMATIC S7-300 CPU 317-2 PN/DP
    • All versions < V3.2.19
    • —
    SiemensSIMATIC S7-300 CPU 317F-2 PN/DP
    • All versions < V3.2.19
    • —
    SiemensSIMATIC S7-300 CPU 317T-3 PN/DP
    • All versions < V3.2.19
    • —
    SiemensSIMATIC S7-300 CPU 317TF-3 PN/DP
    • All versions < V3.2.19
    • —
    SiemensSIMATIC S7-300 CPU 319-3 PN/DP
    • All versions < V3.2.19
    • —
    SiemensSIMATIC S7-300 CPU 319F-3 PN/DP
    • All versions < V3.2.19
    • —
    SiemensSIMATIC S7-400 CPU 412-2 PN V7
    • —
    • —
    SiemensSIMATIC S7-400 CPU 414-3 PN/DP V7
    • —
    • —
    SiemensSIMATIC S7-400 CPU 414F-3 PN/DP V7
    • —
    • —
    SiemensSIMATIC S7-400 CPU 416-3 PN/DP V7
    • —
    • —
    SiemensSIMATIC S7-400 CPU 416F-3 PN/DP V7
    • —
    • —
    SiemensSIMATIC S7-400 H V6 CPU family (incl. SIPLUS variants)
    • —
    • —
    SiemensSIMATIC S7-410 V10 CPU family (incl. SIPLUS variants)
    • All versions < V10.1.1
    • —
    SiemensSIMATIC S7-410 V8 CPU family (incl. SIPLUS variants)
    • —
    • —
    SiemensSIMATIC TDC CP51M1
    • —
    • —
    SiemensSIMATIC TDC CPU555
    • —
    • —
    SiemensSIMATIC WinAC RTX 2010
    • All versions
    • —
    SiemensSIMATIC WinAC RTX F 2010
    • All versions
    • —
    SiemensSINAMICS DCM
    • —
    • —

    Vendors and products

    Affected operating systems

    Affected operating systems
    Othersiemenssimatic_cfu_diq_firmware—
    Othersiemenssimatic_cfu_pa_firmware—
    Othersiemenssimatic_s7-1500_cpu_firmware—
    Othersiemenssimatic_s7-300_cpu_firmware—
    Othersiemenssimatic_s7-400_pn\/dp_v7_firmware—
    Othersiemenssimatic_s7-400h_v6_firmware—
    Othersiemenssimatic_s7-410_v10_firmware—
    Othersiemenssimatic_s7-410_v8_firmware—
    Othersiemenssimatic_tdc_cp51m1_firmware—
    Othersiemenssimatic_tdc_cpu555_firmware—
    Othersiemenssimatic_winac_rtx_firmware—

    Weakness classes (CWE)

    • CWE-400Uncontrolled Resource Consumption

      Class

      The product does not properly control the allocation and maintenance of a limited resource.

      Entry at MITRE CWE-400

    References & sources

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    Badge preview for CVE-2022-25622
    <a href="https://intel.neosec.eu/en/cve/CVE-2022-25622"><img src="https://intel.neosec.eu/badge/cve/CVE-2022-25622.svg?lang=en" alt="CVE-2022-25622 – NEOSEC Intel" height="20"></a>