CriticalCVE-2022-34819

    Siemens SIMATIC CP 1242-7 V2: Heap-based Buffer Overflow (CVE-2022-34819)

    Published Sources: CVE.org, Siemens ProductCERT

    What is affected, what to do

    A vulnerability has been identified in SIMATIC CP 1242-7 V2 (All versions < V3.3.46), SIMATIC CP 1243-1 (All versions < V3.3.46), SIMATIC CP 1243-7 LTE EU (All versions < V3.3.46), SIMATIC CP 1243-7 LTE US (All versions < V3.3.46), SIMATIC CP 1243-8 IRC (All versions < V3.3.46), SIMATIC CP 1542SP-1 IRC (All versions >= V2.0 < V2.2.28), SIMATIC CP 1543-1 (All versions < V3.0.22), SIMATIC CP 1543SP-1 (All versions >= V2.0 < V2.2.28), SIPLUS ET 200SP CP 1542SP-1 IRC TX RAIL (All versions >= V2.0 < V2.2.28), SIPLUS ET 200SP CP 1543SP-1 ISEC (All versions >= V2.0 < V2.2.28), SIPLUS ET 200SP CP 1543SP-1 ISEC TX RAIL (All versions >= V2.0 < V2.2.28), SIPLUS NET CP 1242-7 V2 (All versions < V3.3.46), SIPLUS NET CP 1543-1 (All versions < V3.0.22), SIPLUS S7-1200 CP 1243-1 (All versions < V3.3.46), SIPLUS S7-1200 CP 1243-1 RAIL (All versions < V3.3.46). The application lacks proper validation of user-supplied data when parsing specific messages.

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

    Affected
    • Siemens SIMATIC CP 1242-7 V2 eq All versions < V3.3.46..All versions < V3.3.46
    • Siemens SIMATIC CP 1243-1 eq All versions < V3.3.46..All versions < V3.3.46
    • Siemens SIMATIC CP 1243-7 LTE EU eq All versions < V3.3.46..All versions < V3.3.46
    • Siemens SIMATIC CP 1243-7 LTE US eq All versions < V3.3.46..All versions < V3.3.46
    • Siemens SIMATIC CP 1243-8 IRC eq All versions < V3.3.46..All versions < V3.3.46
    • Siemens SIMATIC CP 1542SP-1 IRC eq All versions >= V2.0 < V2.2.28..All versions >= V2.0 < V2.2.28
    • Siemens SIMATIC CP 1543-1 eq All versions < V3.0.22..All versions < V3.0.22
    • Siemens SIMATIC CP 1543SP-1 eq All versions >= V2.0 < V2.2.28..All versions >= V2.0 < V2.2.28
    • Siemens SIPLUS ET 200SP CP 1542SP-1 IRC TX RAIL eq All versions >= V2.0 < V2.2.28..All versions >= V2.0 < V2.2.28
    • Siemens SIPLUS ET 200SP CP 1543SP-1 ISEC eq All versions >= V2.0 < V2.2.28..All versions >= V2.0 < V2.2.28
    • Siemens SIPLUS ET 200SP CP 1543SP-1 ISEC TX RAIL eq All versions >= V2.0 < V2.2.28..All versions >= V2.0 < V2.2.28
    • Siemens SIPLUS NET CP 1242-7 V2 eq All versions < V3.3.46..All versions < V3.3.46
    • Siemens SIPLUS NET CP 1543-1 eq All versions < V3.0.22..All versions < V3.0.22
    • Siemens SIPLUS S7-1200 CP 1243-1 eq All versions < V3.3.46..All versions < V3.3.46
    • Siemens SIPLUS S7-1200 CP 1243-1 RAIL eq All versions < V3.3.46..All versions < V3.3.46

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    Metrics

    10.0

    Priority

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

    Source: Vendor (CNA), CVSS v3

    10.0

    CVSS v3

    Severity Critical on the scale from 0 to 10.

    Source: CVE.org, Siemens ProductCERT

    2.1 %

    EPSS score

    Moderate — model estimates 1-10% exploitation likelihood.

    Source: FIRST EPSS, percentile 81.6

    Show all metrics
    Severity
    Critical
    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
    104.29 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
    10.0 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
    10.0
    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
    2.1 %
    Moderate — model estimates 1-10% 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
    81.6
    Critical — this CVE ranks in the top fifth of all CVEs scored today (rank ≥ 80%).
    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: total
    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-122

    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 (All versions < V3.3.46), SIMATIC CP 1243-1 (All versions < V3.3.46), SIMATIC CP 1243-7 LTE EU (All versions < V3.3.46), SIMATIC CP 1243-7 LTE US (All versions < V3.3.46), SIMATIC CP 1243-8 IRC (All versions < V3.3.46), SIMATIC CP 1542SP-1 IRC (All versions >= V2.0 < V2.2.28), SIMATIC CP 1543-1 (All versions < V3.0.22), SIMATIC CP 1543SP-1 (All versions >= V2.0 < V2.2.28), SIPLUS ET 200SP CP 1542SP-1 IRC TX RAIL (All versions >= V2.0 < V2.2.28), SIPLUS ET 200SP CP 1543SP-1 ISEC (All versions >= V2.0 < V2.2.28), SIPLUS ET 200SP CP 1543SP-1 ISEC TX RAIL (All versions >= V2.0 < V2.2.28), SIPLUS NET CP 1242-7 V2 (All versions < V3.3.46), SIPLUS NET CP 1543-1 (All versions < V3.0.22), SIPLUS S7-1200 CP 1243-1 (All versions < V3.3.46), SIPLUS S7-1200 CP 1243-1 RAIL (All versions < V3.3.46). The application lacks proper validation of user-supplied data when parsing specific messages. This could result in a heap-based buffer overflow. An attacker could leverage this vulnerability to execute code in the context of device.

    Source: NVD (NIST), cvelistv5, siemens_advisory

    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
    • All versions < V3.3.46
    • —
    SiemensSIMATIC CP 1243-1
    • All versions < V3.3.46
    • —
    SiemensSIMATIC CP 1243-7 LTE EU
    • All versions < V3.3.46
    • —
    SiemensSIMATIC CP 1243-7 LTE US
    • All versions < V3.3.46
    • —
    SiemensSIMATIC CP 1243-8 IRC
    • All versions < V3.3.46
    • —
    SiemensSIMATIC CP 1542SP-1 IRC
    • All versions >= V2.0 < V2.2.28
    • —
    SiemensSIMATIC CP 1543-1
    • All versions < V3.0.22
    • —
    SiemensSIMATIC CP 1543SP-1
    • All versions >= V2.0 < V2.2.28
    • —
    SiemensSIPLUS ET 200SP CP 1542SP-1 IRC TX RAIL
    • All versions >= V2.0 < V2.2.28
    • —
    SiemensSIPLUS ET 200SP CP 1543SP-1 ISEC
    • All versions >= V2.0 < V2.2.28
    • —
    SiemensSIPLUS ET 200SP CP 1543SP-1 ISEC TX RAIL
    • All versions >= V2.0 < V2.2.28
    • —
    SiemensSIPLUS NET CP 1242-7 V2
    • All versions < V3.3.46
    • —
    SiemensSIPLUS NET CP 1543-1
    • All versions < V3.0.22
    • —
    SiemensSIPLUS S7-1200 CP 1243-1
    • All versions < V3.3.46
    • —
    SiemensSIPLUS S7-1200 CP 1243-1 RAIL
    • All versions < V3.3.46
    • —

    Vendors and products

    Affected operating systems

    Affected operating systems
    Othersiemenssimatic_cp_1242-7_v2_firmware—
    Othersiemenssimatic_cp_1243-1_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_irc_firmware—
    Othersiemenssimatic_cp_1543-1_firmware—
    Othersiemenssimatic_cp_1543sp-1_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_1543-1_firmware—
    Othersiemenssiplus_s7-1200_cp_1243-1_firmware—
    Othersiemenssiplus_s7-1200_cp_1243-1_rail_firmware—

    Weakness classes (CWE)

    • CWE-122Heap-based Buffer Overflow

      Variant

      A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

      Entry at MITRE CWE-122

    References & sources

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    Badge preview for CVE-2022-34819
    <a href="https://intel.neosec.eu/en/cve/CVE-2022-34819"><img src="https://intel.neosec.eu/badge/cve/CVE-2022-34819.svg?lang=en" alt="CVE-2022-34819 – NEOSEC Intel" height="20"></a>