FKIE_CVE-2025-66168

Vulnerability from fkie_nvd - Published: 2026-03-04 09:15 - Updated: 2026-03-10 14:09
Severity ?
5.4 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
8.8 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
Apache ActiveMQ does not properly validate the remaining length field which may lead to an overflow during the decoding of malformed packets. When this integer overflow occurs, ActiveMQ may incorrectly compute the total Remaining Length and subsequently misinterpret the payload as multiple MQTT control packets which makes the broker susceptible to unexpected behavior when interacting with non-compliant clients. This behavior violates the MQTT v3.1.1 specification, which restricts Remaining Length to a maximum of 4 bytes. The scenario occurs on established connections after the authentication process. Brokers that are not enabling mqtt transport connectors are not impacted. This issue affects Apache ActiveMQ: before 5.19.2, 6.0.0 to 6.1.8, and 6.2.0 Users are recommended to upgrade to version 5.19.2, 6.1.9, or 6.2.1, which fixes the issue.
References
security@apache.orghttps://lists.apache.org/thread/13n8mkrb2jf2y6yyhpgrkmpqcm7djytoMailing List, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2026/03/03/5Mailing List, Third Party Advisory
Impacted products
Vendor Product Version
apache activemq *
apache activemq *
apache activemq 6.2.0
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:apache:activemq:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "8E187B7C-E072-439F-903C-5AD9227C5AE9",
              "versionEndExcluding": "5.19.2",
              "vulnerable": true
            },
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              "matchCriteriaId": "61868905-AF68-4A48-B6C7-2B6E48D7FAA2",
              "versionEndIncluding": "6.1.8",
              "versionStartIncluding": "6.0.0",
              "vulnerable": true
            },
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          "operator": "OR"
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      ]
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Apache ActiveMQ does not properly validate the remaining length field which may lead to an overflow during the decoding of malformed packets.\u00a0When this integer overflow occurs, ActiveMQ may incorrectly compute the total Remaining Length and subsequently misinterpret the payload as multiple MQTT control packets which makes\u00a0the broker susceptible to unexpected behavior when interacting with non-compliant clients.\u00a0This behavior violates the MQTT v3.1.1 specification, which restricts Remaining Length to a maximum of 4 bytes.\u00a0The scenario occurs on established connections after the authentication process. Brokers that are not enabling mqtt transport connectors are not impacted.\n\nThis issue affects Apache ActiveMQ: before 5.19.2, 6.0.0 to 6.1.8, and 6.2.0\n\nUsers are recommended to upgrade to version 5.19.2, 6.1.9, or 6.2.1, which fixes the issue."
    },
    {
      "lang": "es",
      "value": "Apache ActiveMQ no valida correctamente el campo de longitud restante, lo que puede llevar a un desbordamiento durante la decodificaci\u00f3n de paquetes malformados. Cuando ocurre este desbordamiento de entero, ActiveMQ puede calcular incorrectamente la longitud restante total y posteriormente malinterpretar la carga \u00fatil como m\u00faltiples paquetes de control MQTT, lo que hace que el broker sea susceptible a un comportamiento inesperado al interactuar con clientes no conformes. Este comportamiento viola la especificaci\u00f3n MQTT v3.1.1, que restringe la longitud restante a un m\u00e1ximo de 4 bytes. El escenario ocurre en conexiones establecidas despu\u00e9s del proceso de autenticaci\u00f3n. Los brokers que no est\u00e1n habilitando conectores de transporte mqtt no se ven afectados.\n\nEste problema afecta a Apache ActiveMQ: antes de 5.19.2, 6.0.0 a 6.1.8, y 6.2.0\n\nSe recomienda a los usuarios actualizar a la versi\u00f3n 5.19.2, 6.1.9, o 6.2.1, que corrige el problema."
    }
  ],
  "id": "CVE-2025-66168",
  "lastModified": "2026-03-10T14:09:47.127",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.4,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N",
          "version": "3.1"
        },
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        "impactScore": 2.5,
        "source": "security@apache.org",
        "type": "Secondary"
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          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.8,
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          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2026-03-04T09:15:54.757",
  "references": [
    {
      "source": "security@apache.org",
      "tags": [
        "Mailing List",
        "Vendor Advisory"
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      "url": "https://lists.apache.org/thread/13n8mkrb2jf2y6yyhpgrkmpqcm7djyto"
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  "sourceIdentifier": "security@apache.org",
  "vulnStatus": "Analyzed",
  "weaknesses": [
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          "lang": "en",
          "value": "CWE-190"
        }
      ],
      "source": "security@apache.org",
      "type": "Secondary"
    }
  ]
}


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