Security advisory

{
  "id": "4062c8adfa05b9c6ddb9a6d2c40379058fe2f71d4324f90f13d90e1f6786d93b",
  "url": "https://osv.dev/vulnerability/CVE-2020-13987",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-13987",
    "summary": "An issue was discovered in Contiki through 3.0. An Out-of-Bounds Read vulnerability exists in the uIP TCP/IP Stack component when calculating the checksums for IP packets in upper_layer_chksum in net/ipv4/uip.c.",
    "evidence": "osv:CVE-2020-13987",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2020-13987",
      "aliases": [
        "CVE-2020-13987"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/adamdunkels/uip",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "a49def743f6e5c7d0c0f2d724f0b8e0c563a4a37"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:uip_project:uip:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "1.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "uip-1-0",
            "uip-0-9",
            "uip-0-6",
            "uip-0-5"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-13987.json"
          }
        },
        {
          "ranges": [
            {
              "repo": "https://github.com/open-iscsi/open-iscsi",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "7e00642c40123e0b3f949e74c3945872c17a407e"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:open-iscsi_project:open-iscsi:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "2.1.12"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "2.1.12",
            "2.1.11",
            "2.1.10",
            "2.1.9",
            "2.1.7",
            "2.1.6",
            "2.1.5",
            "2.1.4",
            "2.1.3",
            "2.1.2",
            "2.1.0",
            "2.0.878",
            "2.0.877",
            "2.0.876",
            "2.0.875",
            "2.0.874",
            "2.0.873"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-13987.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:41.899923494Z",
      "provider": "osv",
      "references": [
        "https://us-cert.cisa.gov/ics/advisories/icsa-20-343-01",
        "https://www.kb.cert.org/vuls/id/815128",
        "https://cert-portal.siemens.com/productcert/pdf/ssa-541018.pdf"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:o:siemens:sentron_3va_com100_firmware:*:*:*:*:*:*:*:*"
            ],
            "vendor_product": "siemens:sentron_3va_com100_firmware",
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "4.4.1"
                  }
                ],
                "source": "CPE_RANGE"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:o:siemens:sentron_3va_com800_firmware:*:*:*:*:*:*:*:*"
            ],
            "vendor_product": "siemens:sentron_3va_com800_firmware",
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "4.4.1"
                  }
                ],
                "source": "CPE_RANGE"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:o:siemens:sentron_pac3200_firmware:*:*:*:*:*:*:*:*"
            ],
            "vendor_product": "siemens:sentron_pac3200_firmware",
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "2.4.7"
                  }
                ],
                "source": "CPE_RANGE"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:o:siemens:sentron_pac4200_firmware:*:*:*:*:*:*:*:*"
            ],
            "vendor_product": "siemens:sentron_pac4200_firmware",
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "2.3.0"
                  }
                ],
                "source": "CPE_RANGE"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2020-13987",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 435235,
  "published_at": "2020-12-11T22:15:12.543+00:00"
}