GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

CVE-2021-25676 (GCVE-0-2021-25676)

Vulnerability from cvelistv5 – Published: 2021-03-15 17:03 – Updated: 2024-08-03 20:11
VLAI
Summary
A vulnerability has been identified in RUGGEDCOM RM1224 (V6.3), SCALANCE M-800 (V6.3), SCALANCE S615 (V6.3), SCALANCE SC-600 (All Versions >= V2.1 and < V2.1.3). Multiple failed SSH authentication attempts could trigger a temporary Denial-of-Service under certain conditions. When triggered, the device will reboot automatically.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-307 - Improper Restriction of Excessive Authentication Attempts
Assigner
References
Impacted products
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T20:11:27.563Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-296266.pdf"
          },
          {
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://us-cert.cisa.gov/ics/advisories/icsa-21-068-02"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "RUGGEDCOM RM1224",
          "vendor": "Siemens",
          "versions": [
            {
              "status": "affected",
              "version": "V6.3"
            }
          ]
        },
        {
          "product": "SCALANCE M-800",
          "vendor": "Siemens",
          "versions": [
            {
              "status": "affected",
              "version": "V6.3"
            }
          ]
        },
        {
          "product": "SCALANCE S615",
          "vendor": "Siemens",
          "versions": [
            {
              "status": "affected",
              "version": "V6.3"
            }
          ]
        },
        {
          "product": "SCALANCE SC-600",
          "vendor": "Siemens",
          "versions": [
            {
              "status": "affected",
              "version": "All Versions \u003e= V2.1 and \u003c V2.1.3"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A vulnerability has been identified in RUGGEDCOM RM1224 (V6.3), SCALANCE M-800 (V6.3), SCALANCE S615 (V6.3), SCALANCE SC-600 (All Versions \u003e= V2.1 and \u003c V2.1.3). Multiple failed SSH authentication attempts could trigger a temporary Denial-of-Service under certain conditions. When triggered, the device will reboot automatically."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-307",
              "description": "CWE-307: Improper Restriction of Excessive Authentication Attempts",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2021-04-22T20:42:21.000Z",
        "orgId": "cec7a2ec-15b4-4faf-bd53-b40f371f3a77",
        "shortName": "siemens"
      },
      "references": [
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-296266.pdf"
        },
        {
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://us-cert.cisa.gov/ics/advisories/icsa-21-068-02"
        }
      ],
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "productcert@siemens.com",
          "ID": "CVE-2021-25676",
          "STATE": "PUBLIC"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "RUGGEDCOM RM1224",
                      "version": {
                        "version_data": [
                          {
                            "version_value": "V6.3"
                          }
                        ]
                      }
                    },
                    {
                      "product_name": "SCALANCE M-800",
                      "version": {
                        "version_data": [
                          {
                            "version_value": "V6.3"
                          }
                        ]
                      }
                    },
                    {
                      "product_name": "SCALANCE S615",
                      "version": {
                        "version_data": [
                          {
                            "version_value": "V6.3"
                          }
                        ]
                      }
                    },
                    {
                      "product_name": "SCALANCE SC-600",
                      "version": {
                        "version_data": [
                          {
                            "version_value": "All Versions \u003e= V2.1 and \u003c V2.1.3"
                          }
                        ]
                      }
                    }
                  ]
                },
                "vendor_name": "Siemens"
              }
            ]
          }
        },
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "eng",
              "value": "A vulnerability has been identified in RUGGEDCOM RM1224 (V6.3), SCALANCE M-800 (V6.3), SCALANCE S615 (V6.3), SCALANCE SC-600 (All Versions \u003e= V2.1 and \u003c V2.1.3). Multiple failed SSH authentication attempts could trigger a temporary Denial-of-Service under certain conditions. When triggered, the device will reboot automatically."
            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "eng",
                  "value": "CWE-307: Improper Restriction of Excessive Authentication Attempts"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://cert-portal.siemens.com/productcert/pdf/ssa-296266.pdf",
              "refsource": "MISC",
              "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-296266.pdf"
            },
            {
              "name": "https://us-cert.cisa.gov/ics/advisories/icsa-21-068-02",
              "refsource": "CONFIRM",
              "url": "https://us-cert.cisa.gov/ics/advisories/icsa-21-068-02"
            }
          ]
        }
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "cec7a2ec-15b4-4faf-bd53-b40f371f3a77",
    "assignerShortName": "siemens",
    "cveId": "CVE-2021-25676",
    "datePublished": "2021-03-15T17:03:31.000Z",
    "dateReserved": "2021-01-21T00:00:00.000Z",
    "dateUpdated": "2024-08-03T20:11:27.563Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2021-25676",
      "date": "2026-09-17",
      "epss": "0.0129",
      "percentile": "0.68808"
    },
    "fkie_nvd": {
      "configurations": "[{\"operator\": \"AND\", \"nodes\": [{\"operator\": \"OR\", \"negate\": false, \"cpeMatch\": [{\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:siemens:ruggedcom_rm1224_firmware:6.3:*:*:*:*:*:*:*\", \"matchCriteriaId\": \"041588BC-B3E6-400F-AF25-869D38EE3A1D\"}]}, {\"operator\": \"OR\", \"negate\": false, \"cpeMatch\": [{\"vulnerable\": false, \"criteria\": \"cpe:2.3:h:siemens:ruggedcom_rm1224:-:*:*:*:*:*:*:*\", \"matchCriteriaId\": \"284DF779-D900-48B4-A177-7281CD445AB5\"}]}]}, {\"operator\": \"AND\", \"nodes\": [{\"operator\": \"OR\", \"negate\": false, \"cpeMatch\": [{\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:siemens:scalance_m-800_firmware:6.3:*:*:*:*:*:*:*\", \"matchCriteriaId\": \"57AE2532-01C4-4E62-836B-48FA7B0D932A\"}]}, {\"operator\": \"OR\", \"negate\": false, \"cpeMatch\": [{\"vulnerable\": false, \"criteria\": \"cpe:2.3:h:siemens:scalance_m-800:-:*:*:*:*:*:*:*\", \"matchCriteriaId\": \"DFB9921A-5204-40A3-88AB-B7755F5C6875\"}]}]}, {\"operator\": \"AND\", \"nodes\": [{\"operator\": \"OR\", \"negate\": false, \"cpeMatch\": [{\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:siemens:scalance_s615_firmware:6.3:*:*:*:*:*:*:*\", \"matchCriteriaId\": \"A2B9767D-9249-4524-BA86-484610EDF9D1\"}]}, {\"operator\": \"OR\", \"negate\": false, \"cpeMatch\": [{\"vulnerable\": false, \"criteria\": \"cpe:2.3:h:siemens:scalance_s615:-:*:*:*:*:*:*:*\", \"matchCriteriaId\": \"E917CBBB-EF41-4113-B0CA-EB91889235E7\"}]}]}, {\"operator\": \"AND\", \"nodes\": [{\"operator\": \"OR\", \"negate\": false, \"cpeMatch\": [{\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:siemens:scalance_sc-600_firmware:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"2.1\", \"versionEndExcluding\": \"2.1.3\", \"matchCriteriaId\": \"FABE752D-A89A-4C2A-980E-AC75E471BA51\"}]}, {\"operator\": \"OR\", \"negate\": false, \"cpeMatch\": [{\"vulnerable\": false, \"criteria\": \"cpe:2.3:h:siemens:scalance_sc-600:-:*:*:*:*:*:*:*\", \"matchCriteriaId\": \"725C671B-D7A0-48CF-8A31-5F9C4173F1DD\"}]}]}]",
      "descriptions": "[{\"lang\": \"en\", \"value\": \"A vulnerability has been identified in RUGGEDCOM RM1224 (V6.3), SCALANCE M-800 (V6.3), SCALANCE S615 (V6.3), SCALANCE SC-600 (All Versions \u003e= V2.1 and \u003c V2.1.3). Multiple failed SSH authentication attempts could trigger a temporary Denial-of-Service under certain conditions. When triggered, the device will reboot automatically.\"}, {\"lang\": \"es\", \"value\": \"Se ha identificado una vulnerabilidad en RUGGEDCOM RM1224 (versi\\u00f3n V6.3), SCALANCE M-800 (versi\\u00f3n V6.3), SCALANCE S615 (versi\\u00f3n V6.3), SCALANCE SC-600 (Todas las versiones  posteriores a V2.1 y anteriores a V2.1.3) .\u0026#xa0;M\\u00faltiples intentos fallidos de autenticaci\\u00f3n SSH podr\\u00edan desencadenar una Denegaci\\u00f3n de Servicio temporal en determinadas condiciones.\u0026#xa0;Cuando es desencadenada, el dispositivo se reiniciar\\u00e1 autom\\u00e1ticamente\"}]",
      "id": "CVE-2021-25676",
      "lastModified": "2024-11-21T05:55:16.667",
      "metrics": "{\"cvssMetricV31\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\", \"baseScore\": 7.5, \"baseSeverity\": \"HIGH\", \"attackVector\": \"NETWORK\", \"attackComplexity\": \"LOW\", \"privilegesRequired\": \"NONE\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"NONE\", \"integrityImpact\": \"NONE\", \"availabilityImpact\": \"HIGH\"}, \"exploitabilityScore\": 3.9, \"impactScore\": 3.6}], \"cvssMetricV2\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"2.0\", \"vectorString\": \"AV:N/AC:L/Au:N/C:N/I:N/A:P\", \"baseScore\": 5.0, \"accessVector\": \"NETWORK\", \"accessComplexity\": \"LOW\", \"authentication\": \"NONE\", \"confidentialityImpact\": \"NONE\", \"integrityImpact\": \"NONE\", \"availabilityImpact\": \"PARTIAL\"}, \"baseSeverity\": \"MEDIUM\", \"exploitabilityScore\": 10.0, \"impactScore\": 2.9, \"acInsufInfo\": false, \"obtainAllPrivilege\": false, \"obtainUserPrivilege\": false, \"obtainOtherPrivilege\": false, \"userInteractionRequired\": false}]}",
      "published": "2021-03-15T17:15:22.127",
      "references": "[{\"url\": \"https://cert-portal.siemens.com/productcert/pdf/ssa-296266.pdf\", \"source\": \"productcert@siemens.com\", \"tags\": [\"Vendor Advisory\"]}, {\"url\": \"https://us-cert.cisa.gov/ics/advisories/icsa-21-068-02\", \"source\": \"productcert@siemens.com\", \"tags\": [\"Third Party Advisory\", \"US Government Resource\"]}, {\"url\": \"https://cert-portal.siemens.com/productcert/pdf/ssa-296266.pdf\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Vendor Advisory\"]}, {\"url\": \"https://us-cert.cisa.gov/ics/advisories/icsa-21-068-02\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Third Party Advisory\", \"US Government Resource\"]}]",
      "sourceIdentifier": "productcert@siemens.com",
      "vulnStatus": "Modified",
      "weaknesses": "[{\"source\": \"productcert@siemens.com\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-307\"}]}]"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-25676\",\"sourceIdentifier\":\"productcert@siemens.com\",\"published\":\"2021-03-15T17:15:22.127\",\"lastModified\":\"2024-11-21T05:55:16.667\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"A vulnerability has been identified in RUGGEDCOM RM1224 (V6.3), SCALANCE M-800 (V6.3), SCALANCE S615 (V6.3), SCALANCE SC-600 (All Versions \u003e= V2.1 and \u003c V2.1.3). Multiple failed SSH authentication attempts could trigger a temporary Denial-of-Service under certain conditions. When triggered, the device will reboot automatically.\"},{\"lang\":\"es\",\"value\":\"Se ha identificado una vulnerabilidad en RUGGEDCOM RM1224 (versi\u00f3n V6.3), SCALANCE M-800 (versi\u00f3n V6.3), SCALANCE S615 (versi\u00f3n V6.3), SCALANCE SC-600 (Todas las versiones  posteriores a V2.1 y anteriores a V2.1.3) .\u0026#xa0;M\u00faltiples intentos fallidos de autenticaci\u00f3n SSH podr\u00edan desencadenar una Denegaci\u00f3n de Servicio temporal en determinadas condiciones.\u0026#xa0;Cuando es desencadenada, el dispositivo se reiniciar\u00e1 autom\u00e1ticamente\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}],\"cvssMetricV2\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"2.0\",\"vectorString\":\"AV:N/AC:L/Au:N/C:N/I:N/A:P\",\"baseScore\":5.0,\"accessVector\":\"NETWORK\",\"accessComplexity\":\"LOW\",\"authentication\":\"NONE\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"PARTIAL\"},\"baseSeverity\":\"MEDIUM\",\"exploitabilityScore\":10.0,\"impactScore\":2.9,\"acInsufInfo\":false,\"obtainAllPrivilege\":false,\"obtainUserPrivilege\":false,\"obtainOtherPrivilege\":false,\"userInteractionRequired\":false}]},\"weaknesses\":[{\"source\":\"productcert@siemens.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-307\"}]}],\"configurations\":[{\"operator\":\"AND\",\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:siemens:ruggedcom_rm1224_firmware:6.3:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"041588BC-B3E6-400F-AF25-869D38EE3A1D\"}]},{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:siemens:ruggedcom_rm1224:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"284DF779-D900-48B4-A177-7281CD445AB5\"}]}]},{\"operator\":\"AND\",\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:siemens:scalance_m-800_firmware:6.3:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"57AE2532-01C4-4E62-836B-48FA7B0D932A\"}]},{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:siemens:scalance_m-800:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"DFB9921A-5204-40A3-88AB-B7755F5C6875\"}]}]},{\"operator\":\"AND\",\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:siemens:scalance_s615_firmware:6.3:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"A2B9767D-9249-4524-BA86-484610EDF9D1\"}]},{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:siemens:scalance_s615:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"E917CBBB-EF41-4113-B0CA-EB91889235E7\"}]}]},{\"operator\":\"AND\",\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:siemens:scalance_sc-600_firmware:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.1\",\"versionEndExcluding\":\"2.1.3\",\"matchCriteriaId\":\"FABE752D-A89A-4C2A-980E-AC75E471BA51\"}]},{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:siemens:scalance_sc-600:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"725C671B-D7A0-48CF-8A31-5F9C4173F1DD\"}]}]}],\"references\":[{\"url\":\"https://cert-portal.siemens.com/productcert/pdf/ssa-296266.pdf\",\"source\":\"productcert@siemens.com\",\"tags\":[\"Vendor Advisory\"]},{\"url\":\"https://us-cert.cisa.gov/ics/advisories/icsa-21-068-02\",\"source\":\"productcert@siemens.com\",\"tags\":[\"Third Party Advisory\",\"US Government Resource\"]},{\"url\":\"https://cert-portal.siemens.com/productcert/pdf/ssa-296266.pdf\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Vendor Advisory\"]},{\"url\":\"https://us-cert.cisa.gov/ics/advisories/icsa-21-068-02\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\",\"US Government Resource\"]}]}}",
    "redhat_vex": {
      "current_release_date": "2026-03-27T14:31:56+00:00",
      "cve": "CVE-2021-25676",
      "id": "CVE-2021-25676",
      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "CVE-2021-25676",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-25676.json",
      "version": "3"
    }
  }
}



Log in or create an account to share your comment.




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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.