{
  "document": {
    "acknowledgments": [
      {
        "organization": "Siemens ProductCERT",
        "summary": "reporting this vulnerability to CISA."
      },
      {
        "organization": "Cybersecurity and Infrastructure Security Agency (CISA)",
        "summary": "coordination efforts"
      },
      {
        "organization": "CERT Coordination Center (CERT/CC)",
        "summary": "coordination efforts"
      },
      {
        "names": [
          "Daniel dos Santos",
          "Jos Wetzels",
          "Amine Amri"
        ],
        "organization": "Forescout Technologies",
        "summary": "coordinated disclosure"
      }
    ],
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Disclosure is not limited",
      "tlp": {
        "label": "WHITE",
        "url": "https://us-cert.cisa.gov/tlp/"
      }
    },
    "notes": [
      {
        "category": "summary",
        "text": "Security researchers discovered and disclosed 33 vulnerabilities in several open-source TCP/IP stacks for embedded devices, also known as \"AMNESIA:33\" vulnerabilities.\n\nThis advisory describes the impact of two of these vulnerabilities (CVE-2020-13987, CVE-2020-17437) to Siemens products.\n\nSiemens has released updates for several affected products and recommends to update to the latest versions. Siemens recommends specific countermeasures for products where updates are not available.\n\nThe impact of another \"AMNESIA:33\" vulnerability (CVE-2020-13988) is described in Siemens Security Advisory SSA-541017.",
        "title": "Summary"
      },
      {
        "category": "general",
        "text": "As a general security measure, Siemens strongly recommends to protect network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends to configure the environment according to Siemens\u0027 operational guidelines for Industrial Security (Download: https://www.siemens.com/cert/operational-guidelines-industrial-security), and to follow the recommendations in the product manuals.\n\nAdditional information on Industrial Security by Siemens can be found at: https://www.siemens.com/industrialsecurity",
        "title": "General Recommendations"
      },
      {
        "category": "general",
        "text": "For further inquiries on security vulnerabilities in Siemens products and solutions, please contact the Siemens ProductCERT: https://www.siemens.com/cert/advisories",
        "title": "Additional Resources"
      },
      {
        "category": "legal_disclaimer",
        "text": "Siemens Security Advisories are subject to the terms and conditions contained in Siemens\u0027 underlying license terms or other applicable agreements previously agreed to with Siemens (hereinafter \"License Terms\"). To the extent applicable to information, software or documentation made available in or through a Siemens Security Advisory, the Terms of Use of Siemens\u0027 Global Website (https://www.siemens.com/terms_of_use, hereinafter \"Terms of Use\"), in particular Sections 8-10 of the Terms of Use, shall apply additionally. In case of conflicts, the License Terms shall prevail over the Terms of Use.",
        "title": "Terms of Use"
      },
      {
        "category": "legal_disclaimer",
        "text": "All information products included in https://us-cert.cisa.gov/ics are provided \"as is\" for informational purposes only. The Department of Homeland Security (DHS) does not provide any warranties of any kind regarding any information contained within. DHS does not endorse any commercial product or service, referenced in this product or otherwise. Further dissemination of this product is governed by the Traffic Light Protocol (TLP) marking in the header. For more information about TLP, see https://us-cert.cisa.gov/tlp/.",
        "title": "Legal Notice"
      },
      {
        "category": "other",
        "text": "This CISA CSAF advisory was converted from Siemens ProductCERT\u0027s CSAF advisory.",
        "title": "Advisory Conversion Disclaimer"
      },
      {
        "category": "other",
        "text": "Multiple",
        "title": "Critical infrastructure sectors"
      },
      {
        "category": "other",
        "text": "Worldwide",
        "title": "Countries/areas deployed"
      },
      {
        "category": "other",
        "text": "Germany",
        "title": "Company headquarters location"
      },
      {
        "category": "general",
        "text": "CISA recommends users take defensive measures to minimize the exploitation risk of this vulnerability.",
        "title": "Recommended Practices"
      },
      {
        "category": "general",
        "text": "Minimize network exposure for all control system devices and/or systems, and ensure they are not accessible from the internet.",
        "title": "Recommended Practices"
      },
      {
        "category": "general",
        "text": "Locate control system networks and remote devices behind firewalls and isolate 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 recent version available. Also recognize VPN is only as secure as its connected devices.",
        "title": "Recommended Practices"
      },
      {
        "category": "general",
        "text": "CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.",
        "title": "Recommended Practices"
      },
      {
        "category": "general",
        "text": "CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov. 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"
      },
      {
        "category": "general",
        "text": "CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets. Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov in the technical information paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies.",
        "title": "Recommended Practices"
      },
      {
        "category": "general",
        "text": "Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.",
        "title": "Recommended Practices"
      }
    ],
    "publisher": {
      "category": "other",
      "contact_details": "central@cisa.dhs.gov",
      "name": "CISA",
      "namespace": "https://www.cisa.gov/"
    },
    "references": [
      {
        "category": "self",
        "summary": "SSA-541018: Embedded TCP/IP Stack Vulnerabilities (AMNESIA:33) in SENTRON PAC / 3VA Devices (Part 2) - CSAF Version",
        "url": "https://cert-portal.siemens.com/productcert/csaf/ssa-541018.json"
      },
      {
        "category": "self",
        "summary": "SSA-541018: Embedded TCP/IP Stack Vulnerabilities (AMNESIA:33) in SENTRON PAC / 3VA Devices (Part 2) - TXT Version",
        "url": "https://cert-portal.siemens.com/productcert/txt/ssa-541018.txt"
      },
      {
        "category": "self",
        "summary": "SSA-541018: Embedded TCP/IP Stack Vulnerabilities (AMNESIA:33) in SENTRON PAC / 3VA Devices (Part 2) - PDF Version",
        "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-541018.pdf"
      },
      {
        "category": "self",
        "summary": "ICS Advisory ICSA-21-068-06 JSON",
        "url": "https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2021/icsa-21-068-06.json"
      },
      {
        "category": "self",
        "summary": "ICS Advisory ICSA-21-068-06 - Web Version",
        "url": "https://www.cisa.gov/news-events/ics-advisories/icsa-21-068-06"
      },
      {
        "category": "external",
        "summary": "Recommended Practices",
        "url": "https://www.cisa.gov/uscert/ics/alerts/ICS-ALERT-10-301-01"
      },
      {
        "category": "external",
        "summary": "Recommended Practices",
        "url": "https://www.cisa.gov/resources-tools/resources/ics-recommended-practices"
      },
      {
        "category": "external",
        "summary": "Recommended Practices",
        "url": "https://www.cisa.gov/topics/industrial-control-systems"
      },
      {
        "category": "external",
        "summary": "Recommended Practices",
        "url": "https://us-cert.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf"
      },
      {
        "category": "external",
        "summary": "Recommended Practices",
        "url": "https://www.cisa.gov/sites/default/files/publications/Cybersecurity_Best_Practices_for_Industrial_Control_Systems.pdf"
      },
      {
        "category": "external",
        "summary": "Recommended Practices",
        "url": "https://www.cisa.gov/uscert/ics/tips/ICS-TIP-12-146-01B"
      }
    ],
    "title": "Siemens TCP/IP Stack Vulnerabilities-AMNESIA:33 in SENTRON PAC / 3VA Devices (Update C)",
    "tracking": {
      "current_release_date": "2025-05-06T06:00:00.000000Z",
      "generator": {
        "engine": {
          "name": "CISA CSAF Generator",
          "version": "1.0.0"
        }
      },
      "id": "ICSA-21-068-06",
      "initial_release_date": "2021-03-09T00:00:00.000000Z",
      "revision_history": [
        {
          "date": "2021-03-09T00:00:00.000000Z",
          "legacy_version": "1.0",
          "number": "1",
          "summary": "Publication Date"
        },
        {
          "date": "2021-05-11T00:00:00.000000Z",
          "legacy_version": "1.1",
          "number": "2",
          "summary": "Added download link of update version for SENTRON PAC3220"
        },
        {
          "date": "2021-08-10T00:00:00.000000Z",
          "legacy_version": "1.2",
          "number": "3",
          "summary": "Added solution for SENTRON 3VA COM100/800 and DSP800"
        },
        {
          "date": "2021-10-12T00:00:00.000000Z",
          "legacy_version": "1.3",
          "number": "4",
          "summary": "Added solution for PAC3200T"
        },
        {
          "date": "2022-02-08T00:00:00.000000Z",
          "legacy_version": "1.4",
          "number": "5",
          "summary": "Added solution for SENTRON PAC2200 (with and without MID approval)"
        },
        {
          "date": "2022-03-08T00:00:00.000000Z",
          "legacy_version": "1.5",
          "number": "6",
          "summary": "Added download link of update version for SENTRON PAC2200"
        },
        {
          "date": "2025-05-06T06:00:00.000000Z",
          "legacy_version": "Revision",
          "number": "7",
          "summary": "Revision - Fixing typos"
        }
      ],
      "status": "final",
      "version": "7"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003cV4.4.1",
                "product": {
                  "name": "SENTRON 3VA COM100/800",
                  "product_id": "CSAFPID-0001"
                }
              }
            ],
            "category": "product_name",
            "name": "SENTRON 3VA COM100/800"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003cV4.0",
                "product": {
                  "name": "SENTRON 3VA DSP800",
                  "product_id": "CSAFPID-0002"
                }
              }
            ],
            "category": "product_name",
            "name": "SENTRON 3VA DSP800"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:all/*",
                "product": {
                  "name": "SENTRON PAC2200 (with CLP Approval)",
                  "product_id": "CSAFPID-0003"
                }
              }
            ],
            "category": "product_name",
            "name": "SENTRON PAC2200 (with CLP Approval)"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003cV3.2.2",
                "product": {
                  "name": "SENTRON PAC2200 (with MID Approval)",
                  "product_id": "CSAFPID-0004"
                }
              }
            ],
            "category": "product_name",
            "name": "SENTRON PAC2200 (with MID Approval)"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003cV3.2.2",
                "product": {
                  "name": "SENTRON PAC2200 (without MID Approval)",
                  "product_id": "CSAFPID-0005"
                }
              }
            ],
            "category": "product_name",
            "name": "SENTRON PAC2200 (without MID Approval)"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003cV2.4.7",
                "product": {
                  "name": "SENTRON PAC3200",
                  "product_id": "CSAFPID-0006"
                }
              }
            ],
            "category": "product_name",
            "name": "SENTRON PAC3200"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003cV3.2.2",
                "product": {
                  "name": "SENTRON PAC3200T",
                  "product_id": "CSAFPID-0007"
                }
              }
            ],
            "category": "product_name",
            "name": "SENTRON PAC3200T"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003cV3.2.0",
                "product": {
                  "name": "SENTRON PAC3220",
                  "product_id": "CSAFPID-0008"
                }
              }
            ],
            "category": "product_name",
            "name": "SENTRON PAC3220"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003cV2.3.0",
                "product": {
                  "name": "SENTRON PAC4200",
                  "product_id": "CSAFPID-0009"
                }
              }
            ],
            "category": "product_name",
            "name": "SENTRON PAC4200"
          }
        ],
        "category": "vendor",
        "name": "Siemens"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2020-13987",
      "cwe": {
        "id": "CWE-125",
        "name": "Out-of-bounds Read"
      },
      "notes": [
        {
          "category": "summary",
          "text": "The TCP/IP stack (uIP) in affected devices is vulnerable to out-of-bounds read when calculating the checksum for IP packets. (FSCT-2020-0009)\n\nAn attacker located in the same network could trigger a Denial-of-Service condition on the device by sending a specially crafted IP packet.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-0001",
          "CSAFPID-0006",
          "CSAFPID-0009"
        ]
      },
      "references": [
        {
          "summary": "CVE-2020-13987 - SENTRON 3VA COM100/800",
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109765343/"
        },
        {
          "summary": "CVE-2020-13987 - SENTRON PAC3200",
          "url": "https://support.industry.siemens.com/cs/ww/en/view/31674577/"
        },
        {
          "summary": "CVE-2020-13987 - SENTRON PAC4200",
          "url": "https://support.industry.siemens.com/cs/ww/en/view/35029840/"
        },
        {
          "summary": "CVE-2020-13987 Mitre 5.0 json",
          "url": "https://cert-portal.siemens.com/productcert/mitre/CVE-2020-13987.json"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Update to V4.4.1 or later version",
          "product_ids": [
            "CSAFPID-0001"
          ],
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109765343/"
        },
        {
          "category": "vendor_fix",
          "details": "Update to V2.4.7 or later version",
          "product_ids": [
            "CSAFPID-0006"
          ],
          "url": "https://support.industry.siemens.com/cs/ww/en/view/31674577/"
        },
        {
          "category": "vendor_fix",
          "details": "Update to V2.3.0 or later version",
          "product_ids": [
            "CSAFPID-0009"
          ],
          "url": "https://support.industry.siemens.com/cs/ww/en/view/35029840/"
        },
        {
          "category": "mitigation",
          "details": "For successful exploitation, an attacking system must be located in the same Modbus TCP segment as a vulnerable device. Therefore ensure that only trusted systems are attached to that segment and only trusted persons have access.",
          "product_ids": [
            "CSAFPID-0001",
            "CSAFPID-0006",
            "CSAFPID-0009"
          ]
        }
      ],
      "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/E:P/RL:O/RC:C",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-0001",
            "CSAFPID-0006",
            "CSAFPID-0009"
          ]
        }
      ],
      "title": "CVE-2020-13987"
    },
    {
      "cve": "CVE-2020-17437",
      "cwe": {
        "id": "CWE-787",
        "name": "Out-of-bounds Write"
      },
      "notes": [
        {
          "category": "summary",
          "text": "The TCP/IP stack (uIP) in affected devices is vulnerable to out-of-bounds write when processing TCP packets with urgent pointer (URG) where the location of the TCP data payload is calculated improperly. (FSCT-2020-0018)\n\nAn attacker located in the same network could trigger a Denial-of-Service condition on the device by sending a specially crafted IP packet.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-0001",
          "CSAFPID-0002",
          "CSAFPID-0003",
          "CSAFPID-0004",
          "CSAFPID-0005",
          "CSAFPID-0006",
          "CSAFPID-0007",
          "CSAFPID-0008",
          "CSAFPID-0009"
        ]
      },
      "references": [
        {
          "summary": "CVE-2020-17437 - SENTRON 3VA COM100/800",
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109765343/"
        },
        {
          "summary": "CVE-2020-17437 - SENTRON 3VA DSP800",
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109799046/"
        },
        {
          "summary": "CVE-2020-17437 - SENTRON PAC2200 (without MID Approval)",
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109760897/"
        },
        {
          "summary": "CVE-2020-17437 - SENTRON PAC3200",
          "url": "https://support.industry.siemens.com/cs/ww/en/view/31674577/"
        },
        {
          "summary": "CVE-2020-17437 - SENTRON PAC3200T",
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109793060/"
        },
        {
          "summary": "CVE-2020-17437 - SENTRON PAC3220",
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109780938/"
        },
        {
          "summary": "CVE-2020-17437 - SENTRON PAC4200",
          "url": "https://support.industry.siemens.com/cs/ww/en/view/35029840/"
        },
        {
          "summary": "CVE-2020-17437 Mitre 5.0 json",
          "url": "https://cert-portal.siemens.com/productcert/mitre/CVE-2020-17437.json"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Update to V4.4.1 or later version",
          "product_ids": [
            "CSAFPID-0001"
          ],
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109765343/"
        },
        {
          "category": "vendor_fix",
          "details": "Update to V4.0 or later version",
          "product_ids": [
            "CSAFPID-0002"
          ],
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109799046/"
        },
        {
          "category": "no_fix_planned",
          "details": "Currently no remediation is planned",
          "product_ids": [
            "CSAFPID-0003"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "MID-certified devices do not support firmware updates; V3.2.2 is contained in devices that are labeled as \"M22 MID\"",
          "product_ids": [
            "CSAFPID-0004"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "Update to V3.2.2 or later version",
          "product_ids": [
            "CSAFPID-0005"
          ],
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109760897/"
        },
        {
          "category": "vendor_fix",
          "details": "Update to V2.4.7 or later version",
          "product_ids": [
            "CSAFPID-0006"
          ],
          "url": "https://support.industry.siemens.com/cs/ww/en/view/31674577/"
        },
        {
          "category": "vendor_fix",
          "details": "Update to V3.2.2 or later version",
          "product_ids": [
            "CSAFPID-0007"
          ],
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109793060/"
        },
        {
          "category": "vendor_fix",
          "details": "Update to V3.2.0 or later version",
          "product_ids": [
            "CSAFPID-0008"
          ],
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109780938/"
        },
        {
          "category": "vendor_fix",
          "details": "Update to V2.3.0 or later version",
          "product_ids": [
            "CSAFPID-0009"
          ],
          "url": "https://support.industry.siemens.com/cs/ww/en/view/35029840/"
        },
        {
          "category": "mitigation",
          "details": "For successful exploitation, an attacking system must be located in the same Modbus TCP segment as a vulnerable device. Therefore ensure that only trusted systems are attached to that segment and only trusted persons have access.",
          "product_ids": [
            "CSAFPID-0001",
            "CSAFPID-0002",
            "CSAFPID-0003",
            "CSAFPID-0004",
            "CSAFPID-0005",
            "CSAFPID-0006",
            "CSAFPID-0007",
            "CSAFPID-0008",
            "CSAFPID-0009"
          ]
        }
      ],
      "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/E:P/RL:O/RC:C",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-0001",
            "CSAFPID-0002",
            "CSAFPID-0003",
            "CSAFPID-0004",
            "CSAFPID-0005",
            "CSAFPID-0006",
            "CSAFPID-0007",
            "CSAFPID-0008",
            "CSAFPID-0009"
          ]
        }
      ],
      "title": "CVE-2020-17437"
    }
  ]
}