CVE-2021-41039 (GCVE-0-2021-41039)

Vulnerability from cvelistv5 – Published: 2021-12-01 00:00 – Updated: 2024-08-04 02:59
VLAI
Summary
In versions 1.6 to 2.0.11 of Eclipse Mosquitto, an MQTT v5 client connecting with a large number of user-property properties could cause excessive CPU usage, leading to a loss of performance and possible denial of service.
CWE
Assigner
eclipse CNA under the mitre root
CNA scorecard C 64/100 over 186 records in the last 180 days details
Impacted products
Vendor Product Version CPE status
The Eclipse Foundation Eclipse Mosquitto Affected: 1.6 , < unspecified (custom)
Affected: unspecified , ≤ 2.0.11 (custom)
guessed Create a notification for this product.
Show details on NVD website

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T02:59:31.087Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://bugs.eclipse.org/bugs/show_bug.cgi?id=575314"
          },
          {
            "name": "DSA-5511",
            "tags": [
              "vendor-advisory",
              "x_transferred"
            ],
            "url": "https://www.debian.org/security/2023/dsa-5511"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "Eclipse Mosquitto",
          "vendor": "The Eclipse Foundation",
          "versions": [
            {
              "lessThan": "unspecified",
              "status": "affected",
              "version": "1.6",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "2.0.11",
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "This issue was discovered and reported by Zhanxiang Song, Bin Yuan, DeQing Zou, Hai Jin, Huazhong Univ. of Sci. \u0026 Tech.; Luyi Xing, IU; Yan Jia, Nankai University"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In versions 1.6 to 2.0.11 of Eclipse Mosquitto, an MQTT v5 client connecting with a large number of user-property properties could cause excessive CPU usage, leading to a loss of performance and possible denial of service."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-1050",
              "description": "CWE-1050",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2023-10-02T11:06:32.203Z",
        "orgId": "e51fbebd-6053-4e49-959f-1b94eeb69a2c",
        "shortName": "eclipse"
      },
      "references": [
        {
          "url": "https://bugs.eclipse.org/bugs/show_bug.cgi?id=575314"
        },
        {
          "name": "DSA-5511",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://www.debian.org/security/2023/dsa-5511"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "e51fbebd-6053-4e49-959f-1b94eeb69a2c",
    "assignerShortName": "eclipse",
    "cveId": "CVE-2021-41039",
    "datePublished": "2021-12-01T00:00:00.000Z",
    "dateReserved": "2021-09-13T00:00:00.000Z",
    "dateUpdated": "2024-08-04T02:59:31.087Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2021-41039",
      "date": "2026-10-25",
      "epss": "0.01355",
      "percentile": "0.71426"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "product": "Eclipse Mosquitto",
                "vendor": "The Eclipse Foundation",
                "versions": [
                  {
                    "lessThan": "unspecified",
                    "status": "affected",
                    "version": "1.6",
                    "versionType": "custom"
                  },
                  {
                    "lessThanOrEqual": "2.0.11",
                    "status": "affected",
                    "version": "unspecified",
                    "versionType": "custom"
                  }
                ]
              }
            ],
            "source": "emo@eclipse.org"
          }
        ],
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:a:eclipse:mosquitto:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "24B5FA32-61CC-4331-B08A-134960167D63",
                    "versionEndIncluding": "2.0.11",
                    "versionStartIncluding": "1.6",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In versions 1.6 to 2.0.11 of Eclipse Mosquitto, an MQTT v5 client connecting with a large number of user-property properties could cause excessive CPU usage, leading to a loss of performance and possible denial of service."
          },
          {
            "lang": "es",
            "value": "En las versiones 1.6 a 2.0.11 de Eclipse Mosquitto, un cliente MQTT v5 que se conecte con un gran n\u00famero de propiedades de usuario podr\u00eda causar un uso excesivo de la CPU, conllevando a una p\u00e9rdida de rendimiento y una posible denegaci\u00f3n de servicio"
          }
        ],
        "id": "CVE-2021-41039",
        "lastModified": "2026-06-17T04:07:47.517",
        "metrics": {
          "cvssMetricV2": [
            {
              "acInsufInfo": false,
              "baseSeverity": "MEDIUM",
              "cvssData": {
                "accessComplexity": "LOW",
                "accessVector": "NETWORK",
                "authentication": "NONE",
                "availabilityImpact": "PARTIAL",
                "baseScore": 5.0,
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
                "version": "2.0"
              },
              "exploitabilityScore": 10.0,
              "impactScore": 2.9,
              "obtainAllPrivilege": false,
              "obtainOtherPrivilege": false,
              "obtainUserPrivilege": false,
              "source": "nvd@nist.gov",
              "type": "Primary",
              "userInteractionRequired": false
            }
          ],
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 7.5,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 3.9,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2021-12-01T20:15:07.933",
        "references": [
          {
            "source": "emo@eclipse.org",
            "tags": [
              "Exploit",
              "Issue Tracking",
              "Patch",
              "Vendor Advisory"
            ],
            "url": "https://bugs.eclipse.org/bugs/show_bug.cgi?id=575314"
          },
          {
            "source": "emo@eclipse.org",
            "url": "https://www.debian.org/security/2023/dsa-5511"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Exploit",
              "Issue Tracking",
              "Patch",
              "Vendor Advisory"
            ],
            "url": "https://bugs.eclipse.org/bugs/show_bug.cgi?id=575314"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://www.debian.org/security/2023/dsa-5511"
          }
        ],
        "sourceIdentifier": "emo@eclipse.org",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-1050"
              }
            ],
            "source": "emo@eclipse.org",
            "type": "Secondary"
          },
          {
            "description": [
              {
                "lang": "en",
                "value": "NVD-CWE-Other"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "current_release_date": "2025-11-21T15:31:09+00:00",
      "cve": "CVE-2021-41039",
      "id": "CVE-2021-41039",
      "initial_release_date": "2021-12-01T00:00:00+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "mosquitto: DoS via malicious client",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-41039.json",
      "version": "3"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.


Loading…

Loading…

Loading…

Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
Events included in the timeline

Loading timeline…


    Loading…

    Loading…

    Loading…

    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.