HighCVE-2021-27196

    Specially Crafted IEC 61850 Protocol Sequence Vulnerability (CVE-2021-27196)

    Published Sources: CVE.org

    What is affected, what to do

    Improper Input Validation vulnerability in Hitachi ABB Power Grids Relion 670 Series, Relion 670/650 Series, Relion 670/650/SAM600-IO, Relion 650, REB500, RTU500 Series, FOX615 (TEGO1), MSM, GMS600, PWC600 allows an attacker with access to the IEC 61850 network with knowledge of how to reproduce the attack, as well as the IP addresses of the different IEC 61850 access points (of IEDs/products), to force the device to reboot, which renders the device inoperable for approximately 60 seconds. This vulnerability affects only products with IEC 61850 interfaces.

    Update Hitachi Energy Relion 670 Firmware to version 1.2.3.20, Hitachi Energy Relion 670 Firmware to version 2.0.0.13, Hitachi Energy Relion 670 Firmware to version 2.2.0.13.

    Affected
    • Hitachi Energy Relion 670 Firmware lt 1.2.3..1.2.3.20
    • Hitachi Energy Relion 670 Firmware lt 2.0..2.0.0.13
    • Hitachi Energy Relion 670 Firmware lt 2.2.0..2.2.0.13
    • Hitachi Energy Relion 670 Firmware lt 2.2.1..2.2.1.6
    • Hitachi Energy Relion 670 Firmware lt 2.2.2..2.2.2.3
    • Hitachi Energy Relion 670 Firmware lt 2.2.3..2.2.3.2
    • Hitachi Energy Relion 670 Firmware eq 1.1..1.1
    • Hitachi Energy Relion 670 Firmware eq 2.1..2.1
    • Hitachi Energy Relion 650 Firmware lt 1.3..1.3.0.7
    • Hitachi Energy Relion 650 Firmware lt 2.2.0..2.2.0.13
    • Hitachi Energy Relion 650 Firmware lt 2.2.1..2.2.1.6
    • Hitachi Energy Relion 650 Firmware eq 1.1..1.1
    • Hitachi Energy Relion 650 Firmware eq 1.2..1.2
    • Hitachi Energy Relion 650 Firmware eq 2.1..2.1
    • Hitachi Energy Relion Sam600-io Firmware lt 2.2.1..2.2.1.6
    • Hitachi Energy Rtu500 Firmware eq 7.0..7.0
    • Hitachi Energy Rtu500 Firmware eq 8.0..8.0
    • Hitachi Energy Rtu500 Firmware eq 9.0..9.0
    • Hitachi Energy Rtu500 Firmware eq 10.0..10.0
    • Hitachi Energy Rtu500 Firmware eq 11.0..11.0
    • Hitachi Energy Rtu500 Firmware eq 12.0..12.0
    • Hitachi Energy Reb500 Firmware lt 7.3..7.60.19
    • Hitachi Energy Reb500 Firmware lt 8.2..8.2.0.5
    • Hitachi Energy Reb500 Firmware lte 8.3..8.3.1.0
    • Hitachi Energy Fox615 Tego1 Firmware lt *..r2a16
    • Hitachi Energy Modular Switchgear Monitoring Firmware lt *..2.1.0
    • Hitachi Energy Gms600 Firmware lte *..1.3.0
    • Hitachi Energy Pwc600 Firmware lt 1.0..1.0.1.4
    • Hitachi Energy Pwc600 Firmware lt 1.1..1.1.0.1
    Fixed in
    • Hitachi Energy Relion 670 Firmware 1.2.3.20
    • Hitachi Energy Relion 670 Firmware 2.0.0.13
    • Hitachi Energy Relion 670 Firmware 2.2.0.13
    • Hitachi Energy Relion 670 Firmware 2.2.1.6
    • Hitachi Energy Relion 670 Firmware 2.2.2.3
    • Hitachi Energy Relion 670 Firmware 2.2.3.2
    • Hitachi Energy Relion 650 Firmware 1.3.0.7
    • Hitachi Energy Relion 650 Firmware 2.2.0.13
    • Hitachi Energy Relion 650 Firmware 2.2.1.6
    • Hitachi Energy Relion Sam600-io Firmware 2.2.1.6
    • Hitachi Energy Reb500 Firmware 7.60.19
    • Hitachi Energy Reb500 Firmware 8.2.0.5
    • Hitachi Energy Fox615 Tego1 Firmware r2a16
    • Hitachi Energy Modular Switchgear Monitoring Firmware 2.1.0
    • Hitachi Energy Pwc600 Firmware 1.0.1.4
    • Hitachi Energy Pwc600 Firmware 1.1.0.1

    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

    7.5

    CVSS v3

    Severity High on the scale from 0 to 10.

    Source: CVE.org

    1.6 %

    EPSS score

    Moderate — model estimates 1-10% exploitation likelihood.

    Source: FIRST EPSS, percentile 75.4

    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
    82.93 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
    1.6 %
    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
    75.4
    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

    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

    Improper Input Validation vulnerability in Hitachi ABB Power Grids Relion 670 Series, Relion 670/650 Series, Relion 670/650/SAM600-IO, Relion 650, REB500, RTU500 Series, FOX615 (TEGO1), MSM, GMS600, PWC600 allows an attacker with access to the IEC 61850 network with knowledge of how to reproduce the attack, as well as the IP addresses of the different IEC 61850 access points (of IEDs/products), to force the device to reboot, which renders the device inoperable for approximately 60 seconds. This vulnerability affects only products with IEC 61850 interfaces. This issue affects: Hitachi ABB Power Grids Relion 670 Series 1.1; 1.2.3 versions prior to 1.2.3.20; 2.0 versions prior to 2.0.0.13; 2.1; 2.2.2 versions prior to 2.2.2.3; 2.2.3 versions prior to 2.2.3.2. Hitachi ABB Power Grids Relion 670/650 Series 2.2.0 versions prior to 2.2.0.13. Hitachi ABB Power Grids Relion 670/650/SAM600-IO 2.2.1 versions prior to 2.2.1.6. Hitachi ABB Power Grids Relion 650 1.1; 1.2; 1.3 versions prior to 1.3.0.7. Hitachi ABB Power Grids REB500 7.3; 7.4; 7.5; 7.6; 8.2; 8.3. Hitachi ABB Power Grids RTU500 Series 7.x version 7.x and prior versions; 8.x version 8.x and prior versions; 9.x version 9.x and prior versions; 10.x version 10.x and prior versions; 11.x version 11.x and prior versions; 12.x version 12.x and prior versions. Hitachi ABB Power Grids FOX615 (TEGO1) R1D02 version R1D02 and prior versions. Hitachi ABB Power Grids MSM 2.1.0 versions prior to 2.1.0. Hitachi ABB Power Grids GMS600 1.3.0 version 1.3.0 and prior versions. Hitachi ABB Power Grids PWC600 1.0 versions prior to 1.0.1.4; 1.1 versions prior to 1.1.0.1.

    Source: NVD (NIST), cvelistv5

    Vendors and products

    Affected operating systems

    Affected operating systems
    Otherhitachienergyfox615_tego1_firmware—
    Otherhitachienergygms600_firmware—
    Otherhitachienergymodular_switchgear_monitoring_firmware—
    Otherhitachienergypwc600_firmware—
    Otherhitachienergyreb500_firmware—
    Otherhitachienergyrelion_650_firmware1.1
    Otherhitachienergyrelion_650_firmware1.2
    Otherhitachienergyrelion_650_firmware2.1
    Otherhitachienergyrelion_650_firmware—
    Otherhitachienergyrelion_670_firmware1.1
    Otherhitachienergyrelion_670_firmware2.1
    Otherhitachienergyrelion_670_firmware—
    Otherhitachienergyrelion_sam600-io_firmware—
    Otherhitachienergyrtu500_firmware10.0
    Otherhitachienergyrtu500_firmware11.0
    Otherhitachienergyrtu500_firmware12.0
    Otherhitachienergyrtu500_firmware7.0
    Otherhitachienergyrtu500_firmware8.0
    Otherhitachienergyrtu500_firmware9.0

    References & sources

    • search.abb.comlibrary/Download.aspx?DocumentID=9AKK107991A8932&LanguageCode=e…x_refsource_CONFIRM, Vendor advisory
    • search.abb.comlibrary/Download.aspx?DocumentID=9AKK107991A8936&LanguageCode=e…x_refsource_CONFIRM, Vendor advisory
    • search.abb.comlibrary/Download.aspx?DocumentID=9AKK107991A8934&LanguageCode=e…x_refsource_CONFIRM, Vendor advisory
    • search.abb.comlibrary/Download.aspx?DocumentID=9AKK107991A8937&LanguageCode=e…x_refsource_CONFIRM, Vendor advisory
    • search.abb.comlibrary/Download.aspx?DocumentID=9AKK107991A9057&LanguageCode=e…x_refsource_CONFIRM, Vendor advisory
    • search.abb.comlibrary/Download.aspx?DocumentID=9AKK107991A9058&LanguageCode=e…x_refsource_CONFIRM, Vendor advisory
    • search.abb.comlibrary/Download.aspx?DocumentID=9AKK107991A9059&LanguageCode=e…x_refsource_CONFIRM, Vendor advisory
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