Vulnerability-Lookup

CVE-2025-66168 (GCVE-0-2025-66168)

Vulnerability from cvelistv5 – Published: 2026-03-04 08:45 – Updated: 2026-03-04 20:28

Title

Apache ActiveMQ, Apache ActiveMQ All Module, Apache ActiveMQ MQTT Module: MQTT control packet remaining length field is not properly validated

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.

Severity ?

5.4 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

CWE

CWE-190 - Integer Overflow or Wraparound

Assigner

apache

References

URL

Tags

https://lists.apache.org/thread/13n8mkrb2jf2y6yyh…

vendor-advisory

Impacted products

Vendor

Product

Version

Apache Software Foundation

Apache ActiveMQ

Affected: 0 , < 5.19.2 (semver)
Affected: 6.0.0 , < 6.1.9 (semver)
Affected: 6.2.0 , < 6.2.1 (semver)

	Apache Software Foundation	Apache ActiveMQ All Module	Affected: 0 , < 5.19.2 (semver) Affected: 6.0.0 , < 6.1.9 (semver) Affected: 6.2.0 , < 6.2.1 (semver)
	Apache Software Foundation	Apache ActiveMQ MQTT Module	Affected: 0 , < 5.19.2 (semver) Affected: 6.0.0 , < 6.1.9 (semver) Affected: 6.2.0 , < 6.2.1 (semver)

Credits

Gai Tanaka <641.work123@gmail.com>

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2026-03-04T09:15:41.385Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/03/03/5"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2025-66168",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-03-04T20:27:42.920592Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-03-04T20:28:45.825Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://repo.maven.apache.org/maven2",
          "defaultStatus": "unaffected",
          "packageName": "org.apache.activemq:apache-activemq",
          "product": "Apache ActiveMQ",
          "vendor": "Apache Software Foundation",
          "versions": [
            {
              "lessThan": "5.19.2",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThan": "6.1.9",
              "status": "affected",
              "version": "6.0.0",
              "versionType": "semver"
            },
            {
              "lessThan": "6.2.1",
              "status": "affected",
              "version": "6.2.0",
              "versionType": "semver"
            }
          ]
        },
        {
          "collectionURL": "https://repo.maven.apache.org/maven2",
          "defaultStatus": "unaffected",
          "packageName": "org.apache.activemq:activemq-all",
          "product": "Apache ActiveMQ All Module",
          "vendor": "Apache Software Foundation",
          "versions": [
            {
              "lessThan": "5.19.2",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThan": "6.1.9",
              "status": "affected",
              "version": "6.0.0",
              "versionType": "semver"
            },
            {
              "lessThan": "6.2.1",
              "status": "affected",
              "version": "6.2.0",
              "versionType": "semver"
            }
          ]
        },
        {
          "collectionURL": "https://repo.maven.apache.org/maven2",
          "defaultStatus": "unaffected",
          "packageName": "org.apache.activemq:activemq-mqtt",
          "product": "Apache ActiveMQ MQTT Module",
          "vendor": "Apache Software Foundation",
          "versions": [
            {
              "lessThan": "5.19.2",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThan": "6.1.9",
              "status": "affected",
              "version": "6.0.0",
              "versionType": "semver"
            },
            {
              "lessThan": "6.2.1",
              "status": "affected",
              "version": "6.2.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Gai Tanaka \u003c641.work123@gmail.com\u003e"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003e\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003eApache ActiveMQ does not properly validate the remaining length field which may lead to an overflow during the decoding of malformed packets.\u0026nbsp;\u003c/span\u003e\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003eWhen this integer overflow occurs, ActiveMQ may incorrectly compute the total Remaining Length and subsequently misinterpret the payload as multiple MQTT control packets which makes\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003e\u0026nbsp;the broker susceptible to unexpected behavior when interacting with non-compliant clients.\u003c/span\u003e\u0026nbsp;\u003c/span\u003e\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003eThis behavior violates the MQTT v3.1.1 specification, which restricts Remaining Length to a maximum of 4 bytes.\u003c/span\u003e\u0026nbsp;The scenario occurs on established connections after the authentication process. Brokers that are not enabling mqtt transport connectors are not impacted.\u003c/p\u003e\u003cp\u003eThis issue affects Apache ActiveMQ: before 5.19.2, 6.0.0 to 6.1.8, and 6.2.0\u003c/p\u003e\u003cp\u003eUsers are recommended to upgrade to version 5.19.2, 6.1.9, or 6.2.1, which fixes the issue.\u003c/p\u003e"
            }
          ],
          "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "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"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/E:F/RL:O/RC:C"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-190",
              "description": "CWE-190 Integer Overflow or Wraparound",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-04T08:45:00.932Z",
        "orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
        "shortName": "apache"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://lists.apache.org/thread/13n8mkrb2jf2y6yyhpgrkmpqcm7djyto"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "Apache ActiveMQ, Apache ActiveMQ All Module, Apache ActiveMQ MQTT Module: MQTT control packet remaining length field is not properly validated",
      "x_generator": {
        "engine": "Vulnogram 0.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
    "assignerShortName": "apache",
    "cveId": "CVE-2025-66168",
    "datePublished": "2026-03-04T08:45:00.932Z",
    "dateReserved": "2025-11-21T20:44:42.659Z",
    "dateUpdated": "2026-03-04T20:28:45.825Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-66168\",\"sourceIdentifier\":\"security@apache.org\",\"published\":\"2026-03-04T09:15:54.757\",\"lastModified\":\"2026-03-04T18:08:05.730\",\"vulnStatus\":\"Awaiting Analysis\",\"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.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security@apache.org\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N\",\"baseScore\":5.4,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"LOW\",\"integrityImpact\":\"LOW\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":2.8,\"impactScore\":2.5}]},\"weaknesses\":[{\"source\":\"security@apache.org\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-190\"}]}],\"references\":[{\"url\":\"https://lists.apache.org/thread/13n8mkrb2jf2y6yyhpgrkmpqcm7djyto\",\"source\":\"security@apache.org\"},{\"url\":\"http://www.openwall.com/lists/oss-security/2026/03/03/5\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"http://www.openwall.com/lists/oss-security/2026/03/03/5\"}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2026-03-04T09:15:41.385Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2025-66168\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-03-04T20:27:42.920592Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-03-04T20:28:37.551Z\"}}], \"cna\": {\"title\": \"Apache ActiveMQ, Apache ActiveMQ All Module, Apache ActiveMQ MQTT Module: MQTT control packet remaining length field is not properly validated\", \"source\": {\"discovery\": \"EXTERNAL\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Gai Tanaka \u003c641.work123@gmail.com\u003e\"}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 5.4, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N\", \"integrityImpact\": \"LOW\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"NONE\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"LOW\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/E:F/RL:O/RC:C\"}]}], \"affected\": [{\"vendor\": \"Apache Software Foundation\", \"product\": \"Apache ActiveMQ\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"5.19.2\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"6.0.0\", \"lessThan\": \"6.1.9\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"6.2.0\", \"lessThan\": \"6.2.1\", \"versionType\": \"semver\"}], \"packageName\": \"org.apache.activemq:apache-activemq\", \"collectionURL\": \"https://repo.maven.apache.org/maven2\", \"defaultStatus\": \"unaffected\"}, {\"vendor\": \"Apache Software Foundation\", \"product\": \"Apache ActiveMQ All Module\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"5.19.2\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"6.0.0\", \"lessThan\": \"6.1.9\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"6.2.0\", \"lessThan\": \"6.2.1\", \"versionType\": \"semver\"}], \"packageName\": \"org.apache.activemq:activemq-all\", \"collectionURL\": \"https://repo.maven.apache.org/maven2\", \"defaultStatus\": \"unaffected\"}, {\"vendor\": \"Apache Software Foundation\", \"product\": \"Apache ActiveMQ MQTT Module\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"5.19.2\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"6.0.0\", \"lessThan\": \"6.1.9\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"6.2.0\", \"lessThan\": \"6.2.1\", \"versionType\": \"semver\"}], \"packageName\": \"org.apache.activemq:activemq-mqtt\", \"collectionURL\": \"https://repo.maven.apache.org/maven2\", \"defaultStatus\": \"unaffected\"}], \"references\": [{\"url\": \"https://lists.apache.org/thread/13n8mkrb2jf2y6yyhpgrkmpqcm7djyto\", \"tags\": [\"vendor-advisory\"]}], \"x_generator\": {\"engine\": \"Vulnogram 0.2.0\"}, \"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.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003e\u003cspan style=\\\"background-color: rgb(255, 255, 255);\\\"\u003eApache ActiveMQ does not properly validate the remaining length field which may lead to an overflow during the decoding of malformed packets.\u0026nbsp;\u003c/span\u003e\u003cspan style=\\\"background-color: rgb(255, 255, 255);\\\"\u003eWhen this integer overflow occurs, ActiveMQ may incorrectly compute the total Remaining Length and subsequently misinterpret the payload as multiple MQTT control packets which makes\u003cspan style=\\\"background-color: rgb(255, 255, 255);\\\"\u003e\u0026nbsp;the broker susceptible to unexpected behavior when interacting with non-compliant clients.\u003c/span\u003e\u0026nbsp;\u003c/span\u003e\u003cspan style=\\\"background-color: rgb(255, 255, 255);\\\"\u003eThis behavior violates the MQTT v3.1.1 specification, which restricts Remaining Length to a maximum of 4 bytes.\u003c/span\u003e\u0026nbsp;The scenario occurs on established connections after the authentication process. Brokers that are not enabling mqtt transport connectors are not impacted.\u003c/p\u003e\u003cp\u003eThis issue affects Apache ActiveMQ: before 5.19.2, 6.0.0 to 6.1.8, and 6.2.0\u003c/p\u003e\u003cp\u003eUsers are recommended to upgrade to version 5.19.2, 6.1.9, or 6.2.1, which fixes the issue.\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-190\", \"description\": \"CWE-190 Integer Overflow or Wraparound\"}]}], \"providerMetadata\": {\"orgId\": \"f0158376-9dc2-43b6-827c-5f631a4d8d09\", \"shortName\": \"apache\", \"dateUpdated\": \"2026-03-04T08:45:00.932Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-66168\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-03-04T20:28:45.825Z\", \"dateReserved\": \"2025-11-21T20:44:42.659Z\", \"assignerOrgId\": \"f0158376-9dc2-43b6-827c-5f631a4d8d09\", \"datePublished\": \"2026-03-04T08:45:00.932Z\", \"assignerShortName\": \"apache\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

GHSA-C825-6PH3-4H84

Vulnerability from github – Published: 2026-03-04 09:31 – Updated: 2026-03-04 22:19

Summary

Apache ActiveMQ is Vulnerable to Integer Overflow or Wraparound

Details

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.

Severity ?

5.4 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.apache.activemq:apache-activemq"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.19.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.apache.activemq:apache-activemq"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.0.0"
            },
            {
              "fixed": "6.1.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.apache.activemq:apache-activemq"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.2.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "6.2.0"
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.apache.activemq:activemq-all"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.19.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.apache.activemq:activemq-all"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.0.0"
            },
            {
              "fixed": "6.1.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.apache.activemq:activemq-all"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.2.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "6.2.0"
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.apache.activemq:activemq-mqtt"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.19.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.apache.activemq:activemq-mqtt"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.0.0"
            },
            {
              "fixed": "6.1.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.apache.activemq:activemq-mqtt"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.2.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "6.2.0"
      ]
    }
  ],
  "aliases": [
    "CVE-2025-66168"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-190"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-04T22:19:25Z",
    "nvd_published_at": "2026-03-04T09:15:54Z",
    "severity": "MODERATE"
  },
  "details": "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.",
  "id": "GHSA-c825-6ph3-4h84",
  "modified": "2026-03-04T22:19:25Z",
  "published": "2026-03-04T09:31:07Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-66168"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/apache/activemq"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread/13n8mkrb2jf2y6yyhpgrkmpqcm7djyto"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/03/03/5"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Apache ActiveMQ is Vulnerable to Integer Overflow or Wraparound"
}

Sightings

Author	Source	Type	Date

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.

Action not permitted

CVE-2025-66168 (GCVE-0-2025-66168)

GHSA-C825-6PH3-4H84

Tags

Sightings

Nomenclature