ICSA-26-204-06

Vulnerability from csaf_cisa - Published: 2026-07-23 06:00 - Updated: 2026-07-23 06:00
Summary
MZ Automation libIEC61850
Notes
Legal Notice and Terms of Use: This product is provided subject to this Notification (https://www.cisa.gov/notification) and this Privacy & Use policy (https://www.cisa.gov/privacy-policy).
Advisory Summary: Successful exploitation of these vulnerabilities could allow an unauthenticated network-adjacent attacker to crash critical IEC 61850 services or execute arbitrary code, disrupting or compromising protection, visibility, and control functions.
Critical infrastructure sectors: Critical Manufacturing, Energy, Transportation Systems
Countries/areas deployed: Worldwide
Company headquarters location: Germany
Recommended Practices: CISA recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities.
Recommended Practices: Minimize network exposure for all control system devices and/or systems, ensuring they are not accessible from the internet.
Recommended Practices: Locate control system networks and remote devices behind firewalls and isolating them from business networks.
Recommended Practices: When remote access is required, use more secure methods, such as Virtual Private Networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize VPN is only as secure as the connected devices.
Recommended Practices: CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
Recommended Practices: CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov/ics. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.
Recommended Practices: CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets.
Recommended Practices: Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies.
Recommended Practices: Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.
Recommended Practices: CISA also recommends users take the following measures to protect themselves from social engineering attacks:
Recommended Practices: Do not click web links or open attachments in unsolicited email messages.
Recommended Practices: Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams.
Recommended Practices: Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks.
Recommended Practices: No known public exploitation specifically targeting these vulnerabilities has been reported to CISA at this time.
CVE-2026-50039
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-121 - Stack-based Buffer Overflow
Affected products
Product Identifier Version Remediation
MZ Automation libIEC61850: >=v1.0.0|<=v1.6.1
MZ Automation / libIEC61850
 >=v1.0.0|<=v1.6.1
Vendor Fix fix
CVE-2026-49035
8.1 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE-122 - Heap-based Buffer Overflow
Affected products
Product Identifier Version Remediation
MZ Automation libIEC61850: >=v1.0.0|<=v1.6.1
MZ Automation / libIEC61850
 >=v1.0.0|<=v1.6.1
Vendor Fix fix
CVE-2026-50103
6.5 (Medium)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-228 - Improper Handling of Syntactically Invalid Structure
Affected products
Product Identifier Version Remediation
MZ Automation libIEC61850: >=v1.0.0|<=v1.6.1
MZ Automation / libIEC61850
 >=v1.0.0|<=v1.6.1
Vendor Fix fix
CVE-2026-50032
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-476 - NULL Pointer Dereference
Affected products
Product Identifier Version Remediation
MZ Automation libIEC61850: >=v1.0.0|<=v1.6.1
MZ Automation / libIEC61850
 >=v1.0.0|<=v1.6.1
Vendor Fix fix
References
URL Category
https://raw.githubusercontent.com/cisagov/CSAF/de… self
https://www.cisa.gov/news-events/ics-advisories/i… self
https://www.cisa.gov/uscert/ics/alerts/ICS-ALERT-… external
https://www.cisa.gov/resources-tools/resources/ic… external
https://www.cisa.gov/sites/default/files/publicat… external
https://www.cisa.gov/topics/industrial-control-systems external
https://www.cisa.gov/uscert/sites/default/files/p… external
https://www.cisa.gov/uscert/ncas/tips/ST04-014 external
https://www.cisa.gov/news-events/ics-alerts/ics-a… external
https://www.cisa.gov/sites/default/files/recommen… external
https://www.cisa.gov/news-events/news/targeted-cy… external
https://www.cisa.gov/secure-our-world/teach-emplo… external
https://www.cisa.gov/news-events/news/avoiding-so… external
https://cwe.mitre.org/data/definitions/121.html external
https://www.cve.org/CVERecord?id=CVE-2026-50039 external
https://www.first.org/cvss/calculator/3.1#CVSS:3.… external
https://www.first.org/cvss/calculator/4.0#CVSS:4.… external
https://cwe.mitre.org/data/definitions/122.html external
https://www.cve.org/CVERecord?id=CVE-2026-49035 external
https://www.first.org/cvss/calculator/3.1#CVSS:3.… external
https://www.first.org/cvss/calculator/4.0#CVSS:4.… external
https://cwe.mitre.org/data/definitions/228.html external
https://www.cve.org/CVERecord?id=CVE-2026-50103 external
https://www.first.org/cvss/calculator/3.1#CVSS:3.… external
https://www.first.org/cvss/calculator/4.0#CVSS:4.… external
https://cwe.mitre.org/data/definitions/476.html external
https://www.cve.org/CVERecord?id=CVE-2026-50032 external
Acknowledgments
Abhinav Agarwal
To clipboard 

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        "names": [
          "Abhinav Agarwal"
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        "summary": "reported these vulnerabilities to CISA"
      }
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    "category": "csaf_security_advisory",
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    "distribution": {
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      },
      {
        "category": "summary",
        "text": "Successful exploitation of these vulnerabilities could allow an unauthenticated network-adjacent attacker to crash critical IEC 61850 services or execute arbitrary code, disrupting or compromising protection, visibility, and control functions.",
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      {
        "category": "other",
        "text": "Critical Manufacturing, Energy, Transportation Systems",
        "title": "Critical infrastructure sectors"
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        "text": "Worldwide",
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        "title": "Recommended Practices"
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        "text": "Minimize network exposure for all control system devices and/or systems, ensuring they are not accessible from the internet.",
        "title": "Recommended Practices"
      },
      {
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        "text": "Locate control system networks and remote devices behind firewalls and isolating them from business networks.",
        "title": "Recommended Practices"
      },
      {
        "category": "general",
        "text": "When remote access is required, use more secure methods, such as Virtual Private Networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize VPN is only as secure as the connected devices.",
        "title": "Recommended Practices"
      },
      {
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        "text": "CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.",
        "title": "Recommended Practices"
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      {
        "category": "general",
        "text": "CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov/ics. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.",
        "title": "Recommended Practices"
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        "title": "Recommended Practices"
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        "title": "Recommended Practices"
      },
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        "title": "Recommended Practices"
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        "text": "CISA also recommends users take the following measures to protect themselves from social engineering attacks:",
        "title": "Recommended Practices"
      },
      {
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        "text": "Do not click web links or open attachments in unsolicited email messages.",
        "title": "Recommended Practices"
      },
      {
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        "text": "Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams.",
        "title": "Recommended Practices"
      },
      {
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        "text": "Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks.",
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        "url": "https://www.cisa.gov/uscert/ics/alerts/ICS-ALERT-10-301-01"
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    "title": "MZ Automation libIEC61850",
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        "name": "Stack-based Buffer Overflow"
      },
      "notes": [
        {
          "category": "summary",
          "text": "The affected product is vulnerable to a stack-based buffer overflow, which may allow an attacker to cause a memory corruption via a ReadRequest.",
          "title": "Vulnerability Summary"
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          "text": "SSVCv2/E:N/A:N/2026-07-22T06:00:00.000000Z",
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          "details": "MZ Automation recommends updating to the latest build of the libIEC61850 standard. Documentation can be found at https://github.com/mz-automation/libiec61850.",
          "product_ids": [
            "CSAFPID-0001"
          ],
          "url": "https://github.com/mz-automation/libiec61850"
        }
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            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
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        }
      ]
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    {
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      "cwe": {
        "id": "CWE-122",
        "name": "Heap-based Buffer Overflow"
      },
      "notes": [
        {
          "category": "summary",
          "text": "The affected product is vulnerable to a heap-based buffer overflow via a crafted MMS Initiate request. Remote code execution (RCE) has been demonstrated when ASLR is disabled; memory corruption or denial of service may occur in configurations where ASLR is enabled.",
          "title": "Vulnerability Summary"
        },
        {
          "category": "details",
          "text": "SSVCv2/E:N/A:Y/2026-07-22T06:00:00.000000Z",
          "title": "SSVC"
        }
      ],
      "product_status": {
        "known_affected": [
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        ]
      },
      "references": [
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          "summary": "cwe.mitre.org",
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        },
        {
          "category": "external",
          "summary": "www.cve.org",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-49035"
        },
        {
          "category": "external",
          "summary": "www.first.org",
          "url": "https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"
        },
        {
          "category": "external",
          "summary": "www.first.org",
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        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "MZ Automation recommends updating to the latest build of the libIEC61850 standard. Documentation can be found at https://github.com/mz-automation/libiec61850.",
          "product_ids": [
            "CSAFPID-0001"
          ],
          "url": "https://github.com/mz-automation/libiec61850"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
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          ]
        }
      ]
    },
    {
      "cve": "CVE-2026-50103",
      "cwe": {
        "id": "CWE-228",
        "name": "Improper Handling of Syntactically Invalid Structure"
      },
      "notes": [
        {
          "category": "summary",
          "text": "A NULL pointer dereference in the L2 GOOSE and R-GOOSE shared parser, which may allow a network-adjacent attacker to crash a subscribing application by sending a crafted GOOSE frame containing a malformed TLV value.",
          "title": "Vulnerability Summary"
        },
        {
          "category": "details",
          "text": "SSVCv2/E:N/A:Y/2026-07-22T06:00:00.000000Z",
          "title": "SSVC"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-0001"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "cwe.mitre.org",
          "url": "https://cwe.mitre.org/data/definitions/228.html"
        },
        {
          "category": "external",
          "summary": "www.cve.org",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-50103"
        },
        {
          "category": "external",
          "summary": "www.first.org",
          "url": "https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        },
        {
          "category": "external",
          "summary": "www.first.org",
          "url": "https://www.first.org/cvss/calculator/4.0#CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "MZ Automation recommends updating to the latest build of the libIEC61850 standard. Documentation can be found at https://github.com/mz-automation/libiec61850.",
          "product_ids": [
            "CSAFPID-0001"
          ],
          "url": "https://github.com/mz-automation/libiec61850"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-0001"
          ]
        }
      ]
    },
    {
      "cve": "CVE-2026-50032",
      "cwe": {
        "id": "CWE-476",
        "name": "NULL Pointer Dereference"
      },
      "notes": [
        {
          "category": "summary",
          "text": "A NULL pointer dereference in the MMS Write Named Variable List handler, which may allow a network adjacent attacker to crash the server by sending a WriteRequest with an empty listOfData field. ",
          "title": "Vulnerability Summary"
        },
        {
          "category": "details",
          "text": "SSVCv2/E:N/A:Y/2026-07-22T06:00:00.000000Z",
          "title": "SSVC"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-0001"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "cwe.mitre.org",
          "url": "https://cwe.mitre.org/data/definitions/476.html"
        },
        {
          "category": "external",
          "summary": "www.cve.org",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-50032"
        },
        {
          "category": "external",
          "summary": "www.first.org",
          "url": "https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        },
        {
          "category": "external",
          "summary": "www.first.org",
          "url": "https://www.first.org/cvss/calculator/4.0#CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "MZ Automation recommends updating to the latest build of the libIEC61850 standard. Documentation can be found at https://github.com/mz-automation/libiec61850.",
          "product_ids": [
            "CSAFPID-0001"
          ],
          "url": "https://github.com/mz-automation/libiec61850"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-0001"
          ]
        }
      ]
    }
  ]
}



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Tags
Taxonomy of the tags.





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.