CVE-2024-21647 (GCVE-0-2024-21647)

Vulnerability from cvelistv5 – Published: 2024-01-08 13:45 – Updated: 2025-11-03 21:53
VLAI?
Summary
Puma is a web server for Ruby/Rack applications built for parallelism. Prior to version 6.4.2, puma exhibited incorrect behavior when parsing chunked transfer encoding bodies in a way that allowed HTTP request smuggling. Fixed versions limits the size of chunk extensions. Without this limit, an attacker could cause unbounded resource (CPU, network bandwidth) consumption. This vulnerability has been fixed in versions 6.4.2 and 5.6.8.
Severity ?
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
References
Impacted products
Vendor Product Version
puma puma Affected: < 5.6.8
Affected: >= 6.0.0, < 6.4.2
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2025-11-03T21:53:27.921Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "name": "https://github.com/puma/puma/security/advisories/GHSA-c2f4-cvqm-65w2",
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://github.com/puma/puma/security/advisories/GHSA-c2f4-cvqm-65w2"
          },
          {
            "name": "https://github.com/puma/puma/commit/5fc43d73b6ff193325e657a24ed76dec79133e93",
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/puma/puma/commit/5fc43d73b6ff193325e657a24ed76dec79133e93"
          },
          {
            "url": "https://lists.debian.org/debian-lts-announce/2024/11/msg00004.html"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2024-21647",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-05-08T15:56:45.519791Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-06-03T14:37:47.971Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "puma",
          "vendor": "puma",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 5.6.8"
            },
            {
              "status": "affected",
              "version": "\u003e= 6.0.0, \u003c 6.4.2"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Puma is a web server for Ruby/Rack applications built for parallelism. Prior to version 6.4.2, puma exhibited incorrect behavior when parsing chunked transfer encoding bodies in a way that allowed HTTP request smuggling. Fixed versions limits the size of chunk extensions. Without this limit, an attacker could cause unbounded resource (CPU, network bandwidth) consumption. This vulnerability has been fixed in versions 6.4.2 and 5.6.8.\n\n"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-444",
              "description": "CWE-444: Inconsistent Interpretation of HTTP Requests (\u0027HTTP Request/Response Smuggling\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-01-08T13:45:27.510Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/puma/puma/security/advisories/GHSA-c2f4-cvqm-65w2",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/puma/puma/security/advisories/GHSA-c2f4-cvqm-65w2"
        },
        {
          "name": "https://github.com/puma/puma/commit/5fc43d73b6ff193325e657a24ed76dec79133e93",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/puma/puma/commit/5fc43d73b6ff193325e657a24ed76dec79133e93"
        }
      ],
      "source": {
        "advisory": "GHSA-c2f4-cvqm-65w2",
        "discovery": "UNKNOWN"
      },
      "title": "HTTP Request/Response Smuggling in puma"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2024-21647",
    "datePublished": "2024-01-08T13:45:27.510Z",
    "dateReserved": "2023-12-29T16:10:20.366Z",
    "dateUpdated": "2025-11-03T21:53:27.921Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "fkie_nvd": {
      "configurations": "[{\"nodes\": [{\"operator\": \"OR\", \"negate\": false, \"cpeMatch\": [{\"vulnerable\": true, \"criteria\": \"cpe:2.3:a:puma:puma:*:*:*:*:*:ruby:*:*\", \"versionEndExcluding\": \"5.6.8\", \"matchCriteriaId\": \"A4C4E799-9F02-4DF4-A3C3-8A7DA1B86BFE\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:a:puma:puma:*:*:*:*:*:ruby:*:*\", \"versionStartIncluding\": \"6.0.0\", \"versionEndExcluding\": \"6.4.2\", \"matchCriteriaId\": \"9729F4C2-7642-400E-B88A-154E29A8CA2C\"}]}]}]",
      "descriptions": "[{\"lang\": \"en\", \"value\": \"Puma is a web server for Ruby/Rack applications built for parallelism. Prior to version 6.4.2, puma exhibited incorrect behavior when parsing chunked transfer encoding bodies in a way that allowed HTTP request smuggling. Fixed versions limits the size of chunk extensions. Without this limit, an attacker could cause unbounded resource (CPU, network bandwidth) consumption. This vulnerability has been fixed in versions 6.4.2 and 5.6.8.\\n\\n\"}, {\"lang\": \"es\", \"value\": \"Puma es un servidor web para aplicaciones Ruby/Rack creado para el paralelismo. Antes de la versi\\u00f3n 6.4.2, Puma exhib\\u00eda un comportamiento incorrecto al analizar cuerpos de codificaci\\u00f3n de transferencia fragmentados de una manera que permit\\u00eda el contrabando de solicitudes HTTP. Las versiones fijas limitan el tama\\u00f1o de las extensiones de fragmentos. Sin este l\\u00edmite, un atacante podr\\u00eda provocar un consumo ilimitado de recursos (CPU, ancho de banda de red). Esta vulnerabilidad se ha solucionado en las versiones 6.4.2 y 5.6.8.\"}]",
      "id": "CVE-2024-21647",
      "lastModified": "2024-11-21T08:54:47.780",
      "metrics": "{\"cvssMetricV31\": [{\"source\": \"security-advisories@github.com\", \"type\": \"Secondary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H\", \"baseScore\": 5.9, \"baseSeverity\": \"MEDIUM\", \"attackVector\": \"NETWORK\", \"attackComplexity\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"NONE\", \"integrityImpact\": \"NONE\", \"availabilityImpact\": \"HIGH\"}, \"exploitabilityScore\": 2.2, \"impactScore\": 3.6}, {\"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}]}",
      "published": "2024-01-08T14:15:47.640",
      "references": "[{\"url\": \"https://github.com/puma/puma/commit/5fc43d73b6ff193325e657a24ed76dec79133e93\", \"source\": \"security-advisories@github.com\", \"tags\": [\"Patch\"]}, {\"url\": \"https://github.com/puma/puma/security/advisories/GHSA-c2f4-cvqm-65w2\", \"source\": \"security-advisories@github.com\", \"tags\": [\"Vendor Advisory\"]}, {\"url\": \"https://github.com/puma/puma/commit/5fc43d73b6ff193325e657a24ed76dec79133e93\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\"]}, {\"url\": \"https://github.com/puma/puma/security/advisories/GHSA-c2f4-cvqm-65w2\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Vendor Advisory\"]}]",
      "sourceIdentifier": "security-advisories@github.com",
      "vulnStatus": "Modified",
      "weaknesses": "[{\"source\": \"security-advisories@github.com\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-444\"}]}]"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-21647\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2024-01-08T14:15:47.640\",\"lastModified\":\"2025-11-03T22:16:44.987\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Puma is a web server for Ruby/Rack applications built for parallelism. Prior to version 6.4.2, puma exhibited incorrect behavior when parsing chunked transfer encoding bodies in a way that allowed HTTP request smuggling. Fixed versions limits the size of chunk extensions. Without this limit, an attacker could cause unbounded resource (CPU, network bandwidth) consumption. This vulnerability has been fixed in versions 6.4.2 and 5.6.8.\\n\\n\"},{\"lang\":\"es\",\"value\":\"Puma es un servidor web para aplicaciones Ruby/Rack creado para el paralelismo. Antes de la versi\u00f3n 6.4.2, Puma exhib\u00eda un comportamiento incorrecto al analizar cuerpos de codificaci\u00f3n de transferencia fragmentados de una manera que permit\u00eda el contrabando de solicitudes HTTP. Las versiones fijas limitan el tama\u00f1o de las extensiones de fragmentos. Sin este l\u00edmite, un atacante podr\u00eda provocar un consumo ilimitado de recursos (CPU, ancho de banda de red). Esta vulnerabilidad se ha solucionado en las versiones 6.4.2 y 5.6.8.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.9,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.2,\"impactScore\":3.6},{\"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}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-444\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:puma:puma:*:*:*:*:*:ruby:*:*\",\"versionEndExcluding\":\"5.6.8\",\"matchCriteriaId\":\"A4C4E799-9F02-4DF4-A3C3-8A7DA1B86BFE\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:puma:puma:*:*:*:*:*:ruby:*:*\",\"versionStartIncluding\":\"6.0.0\",\"versionEndExcluding\":\"6.4.2\",\"matchCriteriaId\":\"9729F4C2-7642-400E-B88A-154E29A8CA2C\"}]}]}],\"references\":[{\"url\":\"https://github.com/puma/puma/commit/5fc43d73b6ff193325e657a24ed76dec79133e93\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Patch\"]},{\"url\":\"https://github.com/puma/puma/security/advisories/GHSA-c2f4-cvqm-65w2\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Vendor Advisory\"]},{\"url\":\"https://github.com/puma/puma/commit/5fc43d73b6ff193325e657a24ed76dec79133e93\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://github.com/puma/puma/security/advisories/GHSA-c2f4-cvqm-65w2\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Vendor Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2024/11/msg00004.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://github.com/puma/puma/security/advisories/GHSA-c2f4-cvqm-65w2\", \"name\": \"https://github.com/puma/puma/security/advisories/GHSA-c2f4-cvqm-65w2\", \"tags\": [\"x_refsource_CONFIRM\", \"x_transferred\"]}, {\"url\": \"https://github.com/puma/puma/commit/5fc43d73b6ff193325e657a24ed76dec79133e93\", \"name\": \"https://github.com/puma/puma/commit/5fc43d73b6ff193325e657a24ed76dec79133e93\", \"tags\": [\"x_refsource_MISC\", \"x_transferred\"]}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2024/11/msg00004.html\"}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2025-11-03T21:53:27.921Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-21647\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-05-08T15:56:45.519791Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-05-08T15:56:47.701Z\"}}], \"cna\": {\"title\": \"HTTP Request/Response Smuggling in puma\", \"source\": {\"advisory\": \"GHSA-c2f4-cvqm-65w2\", \"discovery\": \"UNKNOWN\"}, \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 5.9, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"HIGH\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}], \"affected\": [{\"vendor\": \"puma\", \"product\": \"puma\", \"versions\": [{\"status\": \"affected\", \"version\": \"\u003c 5.6.8\"}, {\"status\": \"affected\", \"version\": \"\u003e= 6.0.0, \u003c 6.4.2\"}]}], \"references\": [{\"url\": \"https://github.com/puma/puma/security/advisories/GHSA-c2f4-cvqm-65w2\", \"name\": \"https://github.com/puma/puma/security/advisories/GHSA-c2f4-cvqm-65w2\", \"tags\": [\"x_refsource_CONFIRM\"]}, {\"url\": \"https://github.com/puma/puma/commit/5fc43d73b6ff193325e657a24ed76dec79133e93\", \"name\": \"https://github.com/puma/puma/commit/5fc43d73b6ff193325e657a24ed76dec79133e93\", \"tags\": [\"x_refsource_MISC\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"Puma is a web server for Ruby/Rack applications built for parallelism. Prior to version 6.4.2, puma exhibited incorrect behavior when parsing chunked transfer encoding bodies in a way that allowed HTTP request smuggling. Fixed versions limits the size of chunk extensions. Without this limit, an attacker could cause unbounded resource (CPU, network bandwidth) consumption. This vulnerability has been fixed in versions 6.4.2 and 5.6.8.\\n\\n\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-444\", \"description\": \"CWE-444: Inconsistent Interpretation of HTTP Requests (\u0027HTTP Request/Response Smuggling\u0027)\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2024-01-08T13:45:27.510Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-21647\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-11-03T21:53:27.921Z\", \"dateReserved\": \"2023-12-29T16:10:20.366Z\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2024-01-08T13:45:27.510Z\", \"assignerShortName\": \"GitHub_M\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




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.