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CVE-2021-21970 (GCVE-0-2021-21970)

Vulnerability from cvelistv5 – Published: 2022-02-04 22:29 – Updated: 2025-04-15 19:11
VLAI
Summary
An out-of-bounds write vulnerability exists in the HandleSeaCloudMessage functionality of Sealevel Systems, Inc. SeaConnect 370W v1.3.34. The HandleIncomingSeaCloudMessage function uses at [3] the json_object_get_string to populate the p_name global variable. The p_name is only 0x80 bytes long, and the total MQTT message could be up to 0x201 bytes. Because the function json_object_get_string will fill str based on the length of the json’s value and not the actual str size, this would result in a possible out-of-bounds write.
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-04-15 18:19 UTC
CWE
  • CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
References
Impacted products
Vendor Product Version CPE status
n/a Sealevel Affected: Sealevel Systems, Inc. SeaConnect 370W v1.3.34
Show details on NVD website

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              "url": "https://talosintelligence.com/vulnerability_reports/TALOS-2021-1396"
            }
          ],
          "x_legacyV4Record": {
            "CVE_data_meta": {
              "ASSIGNER": "talos-cna@cisco.com",
              "ID": "CVE-2021-21970",
              "STATE": "PUBLIC"
            },
            "affects": {
              "vendor": {
                "vendor_data": [
                  {
                    "product": {
                      "product_data": [
                        {
                          "product_name": "Sealevel",
                          "version": {
                            "version_data": [
                              {
                                "version_value": "Sealevel Systems, Inc. SeaConnect 370W v1.3.34"
                              }
                            ]
                          }
                        }
                      ]
                    },
                    "vendor_name": "n/a"
                  }
                ]
              }
            },
            "data_format": "MITRE",
            "data_type": "CVE",
            "data_version": "4.0",
            "description": {
              "description_data": [
                {
                  "lang": "eng",
                  "value": "An out-of-bounds write vulnerability exists in the HandleSeaCloudMessage functionality of Sealevel Systems, Inc. SeaConnect 370W v1.3.34. The HandleIncomingSeaCloudMessage function uses at [3] the json_object_get_string to populate the p_name global variable. The p_name is only 0x80 bytes long, and the total MQTT message could be up to 0x201 bytes. Because the function json_object_get_string will fill str based on the length of the json\u2019s value and not the actual str size, this would result in a possible out-of-bounds write."
                }
              ]
            },
            "impact": {
              "cvss": {
                "baseScore": 3.7,
                "baseSeverity": "Low",
                "vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N",
                "version": "3.0"
              }
            },
            "problemtype": {
              "problemtype_data": [
                {
                  "description": [
                    {
                      "lang": "eng",
                      "value": "CWE-120: Buffer Copy without Checking Size of Input (\u0027Classic Buffer Overflow\u0027)"
                    }
                  ]
                }
              ]
            },
            "references": {
              "reference_data": [
                {
                  "name": "https://talosintelligence.com/vulnerability_reports/TALOS-2021-1396",
                  "refsource": "MISC",
                  "url": "https://talosintelligence.com/vulnerability_reports/TALOS-2021-1396"
                }
              ]
            }
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "b86d76f8-0f8a-4a96-a78d-d8abfc7fc29b",
        "assignerShortName": "talos",
        "cveId": "CVE-2021-21970",
        "datePublished": "2022-02-04T22:29:01.000Z",
        "dateReserved": "2021-01-04T00:00:00.000Z",
        "dateUpdated": "2025-04-15T19:11:32.563Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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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.

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Detection rules are retrieved from Rulezet.

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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.


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