CVE-2025-53506 (GCVE-0-2025-53506)

Vulnerability from cvelistv5 – Published: 2025-07-10 19:14 – Updated: 2025-11-04 21:11
VLAI
Title
Apache Tomcat: DoS via excessive h2 streams at connection start
Summary
Uncontrolled Resource Consumption vulnerability in Apache Tomcat if an HTTP/2 client did not acknowledge the initial settings frame that reduces the maximum permitted concurrent streams. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.8, from 10.1.0-M1 through 10.1.42, from 9.0.0.M1 through 9.0.106. The following versions were EOL at the time the CVE was created but are known to be affected: 8.5.0 through 8.5.100. Other EOL versions may also be affected. Users are recommended to upgrade to version 11.0.9, 10.1.43 or 9.0.107, which fix the issue.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-400 - Uncontrolled Resource Consumption
Assigner
References
Impacted products
Vendor Product Version
Apache Software Foundation Apache Tomcat Affected: 11.0.0-M1 , ≤ 11.0.8 (semver)
Affected: 10.1.0-M1 , ≤ 10.1.42 (semver)
Affected: 9.0.0.M1 , ≤ 9.0.106 (semver)
Affected: 8.5.0 , ≤ 8.5.100 (semver)
Unknown: 10.0.0-M1 , ≤ 10.0.27 (semver)
Create a notification for this product.
Credits
Kanatoko
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "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"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2025-53506",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-07-11T13:46:01.043076Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-07-11T13:49:02.483Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2025-11-04T21:11:48.893Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/07/msg00009.html"
          },
          {
            "url": "http://www.openwall.com/lists/oss-security/2025/07/10/13"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Apache Tomcat",
          "vendor": "Apache Software Foundation",
          "versions": [
            {
              "lessThanOrEqual": "11.0.8",
              "status": "affected",
              "version": "11.0.0-M1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "10.1.42",
              "status": "affected",
              "version": "10.1.0-M1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "9.0.106",
              "status": "affected",
              "version": "9.0.0.M1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "8.5.100",
              "status": "affected",
              "version": "8.5.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "10.0.27",
              "status": "unknown",
              "version": "10.0.0-M1",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Kanatoko"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eUncontrolled Resource Consumption vulnerability in Apache Tomcat if an HTTP/2 client did not acknowledge the initial settings frame that reduces the maximum permitted concurrent streams.\u003c/p\u003e\u003cp\u003eThis issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.8, from 10.1.0-M1 through 10.1.42, from 9.0.0.M1 through 9.0.106.\u003cbr\u003eThe following versions were EOL at the time the CVE was created but are \nknown to be affected: 8.5.0 through 8.5.100.\u0026nbsp;Other EOL versions may also be affected.\u003cbr\u003e\u003c/p\u003e\u003cp\u003eUsers are recommended to upgrade to version 11.0.9, 10.1.43 or 9.0.107, which fix the issue.\u003c/p\u003e"
            }
          ],
          "value": "Uncontrolled Resource Consumption vulnerability in Apache Tomcat if an HTTP/2 client did not acknowledge the initial settings frame that reduces the maximum permitted concurrent streams.\n\nThis issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.8, from 10.1.0-M1 through 10.1.42, from 9.0.0.M1 through 9.0.106.\nThe following versions were EOL at the time the CVE was created but are \nknown to be affected: 8.5.0 through 8.5.100.\u00a0Other EOL versions may also be affected.\n\n\nUsers are recommended to upgrade to version 11.0.9, 10.1.43 or 9.0.107, which fix the issue."
        }
      ],
      "metrics": [
        {
          "other": {
            "content": {
              "text": "important"
            },
            "type": "Textual description of severity"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-400",
              "description": "CWE-400 Uncontrolled Resource Consumption",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-10-29T11:41:00.258Z",
        "orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
        "shortName": "apache"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://lists.apache.org/thread/p09775q0rd185m6zz98krg0fp45j8kr0"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "Apache Tomcat: DoS via excessive h2 streams at connection start",
      "x_generator": {
        "engine": "Vulnogram 0.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
    "assignerShortName": "apache",
    "cveId": "CVE-2025-53506",
    "datePublished": "2025-07-10T19:14:23.249Z",
    "dateReserved": "2025-07-01T14:22:04.137Z",
    "dateUpdated": "2025-11-04T21:11:48.893Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2025-53506",
      "date": "2026-06-04",
      "epss": "0.01247",
      "percentile": "0.79637"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-53506\",\"sourceIdentifier\":\"security@apache.org\",\"published\":\"2025-07-10T20:15:26.970\",\"lastModified\":\"2025-11-04T22:16:21.790\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Uncontrolled Resource Consumption vulnerability in Apache Tomcat if an HTTP/2 client did not acknowledge the initial settings frame that reduces the maximum permitted concurrent streams.\\n\\nThis issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.8, from 10.1.0-M1 through 10.1.42, from 9.0.0.M1 through 9.0.106.\\nThe following versions were EOL at the time the CVE was created but are \\nknown to be affected: 8.5.0 through 8.5.100.\u00a0Other EOL versions may also be affected.\\n\\n\\nUsers are recommended to upgrade to version 11.0.9, 10.1.43 or 9.0.107, which fix the issue.\"},{\"lang\":\"es\",\"value\":\"Vulnerabilidad de consumo incontrolado de recursos en Apache Tomcat si un cliente HTTP/2 no reconoce el marco de configuraci\u00f3n inicial que reduce el m\u00e1ximo de transmisiones simult\u00e1neas permitidas. Este problema afecta a Apache Tomcat: de 11.0.0-M1 a 11.0.8, de 10.1.0-M1 a 10.1.42, y de 9.0.0.M1 a 9.0.106. Se recomienda actualizar a las versiones 11.0.9, 10.1.43 o 9.0.107, que solucionan el problema.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"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@apache.org\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-400\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"9.0.0\",\"versionEndIncluding\":\"9.0.106\",\"matchCriteriaId\":\"5D1D5DA0-D03A-4A7A-B0F8-78FBC3229322\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"10.1.0\",\"versionEndIncluding\":\"10.1.42\",\"matchCriteriaId\":\"641541D9-6F81-4357-B535-D83D25217A14\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"11.0.0\",\"versionEndIncluding\":\"11.0.8\",\"matchCriteriaId\":\"C16A32B5-DB24-48E2-BABE-6F60360786DF\"}]}]}],\"references\":[{\"url\":\"https://lists.apache.org/thread/p09775q0rd185m6zz98krg0fp45j8kr0\",\"source\":\"security@apache.org\",\"tags\":[\"Issue Tracking\",\"Mailing List\",\"Vendor Advisory\"]},{\"url\":\"http://www.openwall.com/lists/oss-security/2025/07/10/13\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/07/msg00009.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://lists.debian.org/debian-lts-announce/2025/07/msg00009.html\"}, {\"url\": \"http://www.openwall.com/lists/oss-security/2025/07/10/13\"}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2025-11-04T21:11:48.893Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.5, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2025-53506\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-07-11T13:46:01.043076Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-07-11T13:46:20.254Z\"}}], \"cna\": {\"title\": \"Apache Tomcat: DoS via excessive h2 streams at connection start\", \"source\": {\"discovery\": \"EXTERNAL\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Kanatoko\"}], \"metrics\": [{\"other\": {\"type\": \"Textual description of severity\", \"content\": {\"text\": \"important\"}}}], \"affected\": [{\"vendor\": \"Apache Software Foundation\", \"product\": \"Apache Tomcat\", \"versions\": [{\"status\": \"affected\", \"version\": \"11.0.0-M1\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"11.0.8\"}, {\"status\": \"affected\", \"version\": \"10.1.0-M1\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"10.1.42\"}, {\"status\": \"affected\", \"version\": \"9.0.0.M1\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"9.0.106\"}, {\"status\": \"affected\", \"version\": \"8.5.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.5.100\"}, {\"status\": \"unknown\", \"version\": \"10.0.0-M1\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"10.0.27\"}], \"defaultStatus\": \"unaffected\"}], \"references\": [{\"url\": \"https://lists.apache.org/thread/p09775q0rd185m6zz98krg0fp45j8kr0\", \"tags\": [\"vendor-advisory\"]}], \"x_generator\": {\"engine\": \"Vulnogram 0.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"Uncontrolled Resource Consumption vulnerability in Apache Tomcat if an HTTP/2 client did not acknowledge the initial settings frame that reduces the maximum permitted concurrent streams.\\n\\nThis issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.8, from 10.1.0-M1 through 10.1.42, from 9.0.0.M1 through 9.0.106.\\nThe following versions were EOL at the time the CVE was created but are \\nknown to be affected: 8.5.0 through 8.5.100.\\u00a0Other EOL versions may also be affected.\\n\\n\\nUsers are recommended to upgrade to version 11.0.9, 10.1.43 or 9.0.107, which fix the issue.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eUncontrolled Resource Consumption vulnerability in Apache Tomcat if an HTTP/2 client did not acknowledge the initial settings frame that reduces the maximum permitted concurrent streams.\u003c/p\u003e\u003cp\u003eThis issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.8, from 10.1.0-M1 through 10.1.42, from 9.0.0.M1 through 9.0.106.\u003cbr\u003eThe following versions were EOL at the time the CVE was created but are \\nknown to be affected: 8.5.0 through 8.5.100.\u0026nbsp;Other EOL versions may also be affected.\u003cbr\u003e\u003c/p\u003e\u003cp\u003eUsers are recommended to upgrade to version 11.0.9, 10.1.43 or 9.0.107, which fix the issue.\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-400\", \"description\": \"CWE-400 Uncontrolled Resource Consumption\"}]}], \"providerMetadata\": {\"orgId\": \"f0158376-9dc2-43b6-827c-5f631a4d8d09\", \"shortName\": \"apache\", \"dateUpdated\": \"2025-10-29T11:41:00.258Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-53506\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-11-04T21:11:48.893Z\", \"dateReserved\": \"2025-07-01T14:22:04.137Z\", \"assignerOrgId\": \"f0158376-9dc2-43b6-827c-5f631a4d8d09\", \"datePublished\": \"2025-07-10T19:14:23.249Z\", \"assignerShortName\": \"apache\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.