HighCVE-2022-43768

    Siemens SIMATIC CP 1242-7 V2: Allocation of Resources Without Limits or Throttling (CVE-2022-43768)

    Published Last modified Sources: Siemens ProductCERT, CVE.org

    What is affected, what to do

    A vulnerability has been identified in SIMATIC CP 1242-7 V2 (6GK7242-7KX31-0XE0) (All versions < V3.4.29), SIMATIC CP 1243-1 (6GK7243-1BX30-0XE0) (All versions < V3.4.29), SIMATIC CP 1243-1 DNP3 (incl. SIPLUS variants) (All versions < V3.4.29), SIMATIC CP 1243-1 IEC (incl.

    Update Siemens SIMATIC CP 443-1 Firmware Standard Edition to version 3.3, Siemens Simatic Cp 443-1 Advanced Firmware to version 3.3, Siemens Siplus Net Cp 443-1 Firmware to version 3.3.

    Affected
    • Siemens SIMATIC CP 443-1 Firmware Standard Edition lt *..3.3
    • Siemens Simatic Cp 443-1 Advanced Firmware lt *..3.3
    • Siemens Siplus Net Cp 443-1 Firmware lt *..3.3
    • Siemens Siplus Net Cp 443-1 Advanced Firmware lt *..3.3
    • Siemens Siplus Tim 1531 Irc Firmware lt *..2.3.6
    • Siemens TIM 1531 IRC Firmware lt *..2.3.6
    Fixed in
    • Siemens SIMATIC CP 443-1 Firmware Standard Edition 3.3
    • Siemens Simatic Cp 443-1 Advanced Firmware 3.3
    • Siemens Siplus Net Cp 443-1 Firmware 3.3
    • Siemens Siplus Net Cp 443-1 Advanced Firmware 3.3
    • Siemens Siplus Tim 1531 Irc Firmware 2.3.6
    • Siemens TIM 1531 IRC Firmware 2.3.6

    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: Vendor (CNA), CVSS v3

    7.5

    CVSS v3

    Severity High on the scale from 0 to 10.

    Source: Siemens ProductCERT, CVE.org

    1.0 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 61.3

    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
    70.07 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
    7.5
    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
    1.0 %
    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
    61.3
    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 7 February 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-770

    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

    A vulnerability has been identified in SIMATIC CP 1242-7 V2 (6GK7242-7KX31-0XE0) (All versions < V3.4.29), SIMATIC CP 1243-1 (6GK7243-1BX30-0XE0) (All versions < V3.4.29), SIMATIC CP 1243-1 DNP3 (incl. SIPLUS variants) (All versions < V3.4.29), SIMATIC CP 1243-1 IEC (incl. SIPLUS variants) (All versions < V3.4.29), SIMATIC CP 1243-7 LTE EU (6GK7243-7KX30-0XE0) (All versions < V3.4.29), SIMATIC CP 1243-7 LTE US (6GK7243-7SX30-0XE0) (All versions < V3.4.29), SIMATIC CP 1243-8 IRC (6GK7243-8RX30-0XE0) (All versions < V3.4.29), SIMATIC CP 1542SP-1 (6GK7542-6UX00-0XE0) (All versions < V2.3), SIMATIC CP 1542SP-1 IRC (6GK7542-6VX00-0XE0) (All versions < V2.3), SIMATIC CP 1543SP-1 (6GK7543-6WX00-0XE0) (All versions < V2.3), SIMATIC CP 443-1 (6GK7443-1EX30-0XE0) (All versions < V3.3), SIMATIC CP 443-1 (6GK7443-1EX30-0XE1) (All versions < V3.3), SIMATIC CP 443-1 Advanced (6GK7443-1GX30-0XE0) (All versions < V3.3), SIPLUS ET 200SP CP 1542SP-1 IRC TX RAIL (6AG2542-6VX00-4XE0) (All versions < V2.3), SIPLUS ET 200SP CP 1543SP-1 ISEC (6AG1543-6WX00-7XE0) (All versions < V2.3), SIPLUS ET 200SP CP 1543SP-1 ISEC TX RAIL (6AG2543-6WX00-4XE0) (All versions < V2.3), SIPLUS NET CP 1242-7 V2 (6AG1242-7KX31-7XE0) (All versions < V3.4.29), SIPLUS NET CP 443-1 (6AG1443-1EX30-4XE0) (All versions < V3.3), SIPLUS NET CP 443-1 Advanced (6AG1443-1GX30-4XE0) (All versions < V3.3), SIPLUS S7-1200 CP 1243-1 (6AG1243-1BX30-2AX0) (All versions < V3.4.29), SIPLUS S7-1200 CP 1243-1 RAIL (6AG2243-1BX30-1XE0) (All versions < V3.4.29), SIPLUS TIM 1531 IRC (6AG1543-1MX00-7XE0) (All versions < V2.3.6), TIM 1531 IRC (6GK7543-1MX00-0XE0) (All versions < V2.3.6). The webserver of the affected products contains a vulnerability that may lead to a denial of service condition. An attacker may cause a denial of service situation of the webserver of the affected product.

    Source: siemens_advisory, cvelistv5, NVD (NIST)

    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 CP 1242-7 V2
    • —
    • —
    SiemensSIMATIC CP 1243-1
    • —
    • —
    SiemensSIMATIC CP 1243-1 DNP3 (incl. SIPLUS variants)
    • —
    • —
    SiemensSIMATIC CP 1243-1 IEC (incl. SIPLUS variants)
    • —
    • —
    SiemensSIMATIC CP 1243-7 LTE EU
    • —
    • —
    SiemensSIMATIC CP 1243-7 LTE US
    • —
    • —
    SiemensSIMATIC CP 1243-8 IRC
    • —
    • —
    SiemensSIMATIC CP 1542SP-1
    • —
    • —
    SiemensSIMATIC CP 1542SP-1 IRC
    • —
    • —
    SiemensSIMATIC CP 1543SP-1
    • —
    • —
    SiemensSIMATIC CP 443-1
    • —
    • —
    SiemensSIMATIC CP 443-1 Advanced
    • —
    • —
    SiemensSIPLUS ET 200SP CP 1542SP-1 IRC TX RAIL
    • —
    • —
    SiemensSIPLUS ET 200SP CP 1543SP-1 ISEC
    • —
    • —
    SiemensSIPLUS ET 200SP CP 1543SP-1 ISEC TX RAIL
    • —
    • —
    SiemensSIPLUS NET CP 1242-7 V2
    • —
    • —
    SiemensSIPLUS NET CP 443-1
    • —
    • —
    SiemensSIPLUS NET CP 443-1 Advanced
    • —
    • —
    SiemensSIPLUS S7-1200 CP 1243-1
    • —
    • —
    SiemensSIPLUS S7-1200 CP 1243-1 RAIL
    • —
    • —
    SiemensSIPLUS TIM 1531 IRC
    • —
    • —
    SiemensTIM 1531 IRC
    • —
    • —

    Vendors and products

    Affected operating systems

    Affected operating systems
    Othersiemenssimatic_cp_1242-7_v2_firmware—
    Othersiemenssimatic_cp_1243-1_dnp3_firmware—
    Othersiemenssimatic_cp_1243-1_firmware—
    Othersiemenssimatic_cp_1243-1_iec_firmware—
    Othersiemenssimatic_cp_1243-7_lte_eu_firmware—
    Othersiemenssimatic_cp_1243-7_lte_us_firmware—
    Othersiemenssimatic_cp_1243-8_irc_firmware—
    Othersiemenssimatic_cp_1542sp-1_firmware—
    Othersiemenssimatic_cp_1542sp-1_irc_firmware—
    Othersiemenssimatic_cp_1543sp-1_firmware—
    Othersiemenssimatic_cp_443-1_advanced_firmware—
    Othersiemenssimatic_cp_443-1_firmware—
    Othersiemenssimatic_ipc_diagbase_firmware—
    Othersiemenssimatic_ipc_diagmonitor_firmware—
    Othersiemenssiplus_et_200sp_cp_1542sp-1_irc_tx_rail_firmware—
    Othersiemenssiplus_et_200sp_cp_1543sp-1_isec_firmware—
    Othersiemenssiplus_et_200sp_cp_1543sp-1_isec_tx_rail_firmware—
    Othersiemenssiplus_net_cp_1242-7_v2_firmware—
    Othersiemenssiplus_net_cp_443-1_advanced_firmware—
    Othersiemenssiplus_net_cp_443-1_firmware—
    Othersiemenssiplus_s7-1200_cp_1243-1_firmware—
    Othersiemenssiplus_s7-1200_cp_1243-1_rail_firmware—
    Othersiemenssiplus_tim_1531_irc_firmware—
    Othersiemenstim_1531_irc_firmware—

    Weakness classes (CWE)

    • CWE-770Allocation of Resources Without Limits or Throttling

      Base

      The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.

      Entry at MITRE CWE-770

    References & sources

    Changes to this CVE

    Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).

    One NVD translation into another language is hidden.

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    Badge preview for CVE-2022-43768
    <a href="https://intel.neosec.eu/en/cve/CVE-2022-43768"><img src="https://intel.neosec.eu/badge/cve/CVE-2022-43768.svg?lang=en" alt="CVE-2022-43768 – NEOSEC Intel" height="20"></a>