CVE-2025-53506

Published Jul 10, 2025

Last updated 2 months ago

Overview

AI description

Automated description summarized from trusted sources.

CVE-2025-53506 is an uncontrolled resource consumption vulnerability affecting Apache Tomcat. The vulnerability occurs when an HTTP/2 client does not acknowledge the initial settings frame, which reduces the maximum permitted concurrent streams. This issue affects Apache Tomcat versions 11.0.0-M1 through 11.0.8, 10.1.0-M1 through 10.1.42, and 9.0.0.M1 through 9.0.106. To resolve this vulnerability, users are advised to upgrade to versions 11.0.9, 10.1.43, or 9.0.107.

Description: 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. Users are recommended to upgrade to version 11.0.9, 10.1.43 or 9.0.107, which fix the issue.
Source: security@apache.org
NVD status: Modified
Products: tomcat

Risk scores

CVSS 3.1

Type: Secondary
Base score: 7.5
Impact score: 3.6
Exploitability score: 3.9
Vector string: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Severity: HIGH

Weaknesses

security@apache.org: CWE-400

Hype score: Not currently trending

Configurations

[
  {
    "nodes": [
      {
        "negate": false,
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*",
            "vulnerable": true,
            "matchCriteriaId": "5D1D5DA0-D03A-4A7A-B0F8-78FBC3229322",
            "versionEndIncluding": "9.0.106",
            "versionStartIncluding": "9.0.0"
          },
          {
            "criteria": "cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*",
            "vulnerable": true,
            "matchCriteriaId": "641541D9-6F81-4357-B535-D83D25217A14",
            "versionEndIncluding": "10.1.42",
            "versionStartIncluding": "10.1.0"
          },
          {
            "criteria": "cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*",
            "vulnerable": true,
            "matchCriteriaId": "C16A32B5-DB24-48E2-BABE-6F60360786DF",
            "versionEndIncluding": "11.0.8",
            "versionStartIncluding": "11.0.0"
          }
        ],
        "operator": "OR"
      }
    ]
  }
]

References

Sources include official advisories and independent security research.