Vulnerability from bitnami_vulndb
Published
2025-07-16 08:19
Modified
2025-11-06 13:25
Summary
Apache Tomcat: DoS via excessive h2 streams at connection start
Details

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.

To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "Bitnami",
        "name": "tomcat",
        "purl": "pkg:bitnami/tomcat"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "9.0.107"
            },
            {
              "introduced": "10.0.0"
            },
            {
              "fixed": "10.1.43"
            },
            {
              "introduced": "11.0.0"
            },
            {
              "fixed": "11.0.9"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "severity": [
        {
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "type": "CVSS_V3"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-53506"
  ],
  "database_specific": {
    "cpes": [
      "cpe:2.3:a:apache:tomcat:*:*:*:*:*:maven:*:*"
    ],
    "severity": "High"
  },
  "details": "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.",
  "id": "BIT-tomcat-2025-53506",
  "modified": "2025-11-06T13:25:46.476Z",
  "published": "2025-07-16T08:19:04.361Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread/p09775q0rd185m6zz98krg0fp45j8kr0"
    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-53506"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2025/07/10/13"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/07/msg00009.html"
    }
  ],
  "schema_version": "1.6.2",
  "summary": "Apache Tomcat: DoS via excessive h2 streams at connection start"
}


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  • 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.