Vulnerability from bitnami_vulndb
Published
2024-03-06 11:11
Modified
2025-11-06 13:25
Summary
Details

A specially crafted sequence of HTTP/2 requests sent to Apache Tomcat 10.0.0-M1 to 10.0.0-M5, 9.0.0.M1 to 9.0.35 and 8.5.0 to 8.5.55 could trigger high CPU usage for several seconds. If a sufficient number of such requests were made on concurrent HTTP/2 connections, the server could become unresponsive.

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Bitnami",
        "name": "tomcat",
        "purl": "pkg:bitnami/tomcat"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "8.5.0"
            },
            {
              "fixed": "8.5.56"
            },
            {
              "introduced": "9.0.0"
            },
            {
              "fixed": "9.0.36"
            }
          ],
          "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-2020-11996"
  ],
  "database_specific": {
    "cpes": [
      "cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*",
      "cpe:2.3:a:apache:tomcat:10.0.0:milestone1:*:*:*:*:*:*",
      "cpe:2.3:a:apache:tomcat:10.0.0:milestone2:*:*:*:*:*:*",
      "cpe:2.3:a:apache:tomcat:10.0.0:milestone3:*:*:*:*:*:*",
      "cpe:2.3:a:apache:tomcat:10.0.0:milestone4:*:*:*:*:*:*",
      "cpe:2.3:a:apache:tomcat:10.0.0:milestone5:*:*:*:*:*:*",
      "cpe:2.3:a:apache:tomcat:9.0.0:milestone10:*:*:*:*:*:*",
      "cpe:2.3:a:apache:tomcat:9.0.0:milestone11:*:*:*:*:*:*",
      "cpe:2.3:a:apache:tomcat:9.0.0:milestone12:*:*:*:*:*:*",
      "cpe:2.3:a:apache:tomcat:9.0.0:milestone13:*:*:*:*:*:*",
      "cpe:2.3:a:apache:tomcat:9.0.0:milestone14:*:*:*:*:*:*",
      "cpe:2.3:a:apache:tomcat:9.0.0:milestone15:*:*:*:*:*:*",
      "cpe:2.3:a:apache:tomcat:9.0.0:milestone16:*:*:*:*:*:*",
      "cpe:2.3:a:apache:tomcat:9.0.0:milestone17:*:*:*:*:*:*",
      "cpe:2.3:a:apache:tomcat:9.0.0:milestone18:*:*:*:*:*:*",
      "cpe:2.3:a:apache:tomcat:9.0.0:milestone19:*:*:*:*:*:*",
      "cpe:2.3:a:apache:tomcat:9.0.0:milestone1:*:*:*:*:*:*",
      "cpe:2.3:a:apache:tomcat:9.0.0:milestone20:*:*:*:*:*:*",
      "cpe:2.3:a:apache:tomcat:9.0.0:milestone21:*:*:*:*:*:*",
      "cpe:2.3:a:apache:tomcat:9.0.0:milestone22:*:*:*:*:*:*",
      "cpe:2.3:a:apache:tomcat:9.0.0:milestone23:*:*:*:*:*:*",
      "cpe:2.3:a:apache:tomcat:9.0.0:milestone24:*:*:*:*:*:*",
      "cpe:2.3:a:apache:tomcat:9.0.0:milestone25:*:*:*:*:*:*",
      "cpe:2.3:a:apache:tomcat:9.0.0:milestone26:*:*:*:*:*:*",
      "cpe:2.3:a:apache:tomcat:9.0.0:milestone27:*:*:*:*:*:*",
      "cpe:2.3:a:apache:tomcat:9.0.0:milestone2:*:*:*:*:*:*",
      "cpe:2.3:a:apache:tomcat:9.0.0:milestone3:*:*:*:*:*:*",
      "cpe:2.3:a:apache:tomcat:9.0.0:milestone4:*:*:*:*:*:*",
      "cpe:2.3:a:apache:tomcat:9.0.0:milestone5:*:*:*:*:*:*",
      "cpe:2.3:a:apache:tomcat:9.0.0:milestone6:*:*:*:*:*:*",
      "cpe:2.3:a:apache:tomcat:9.0.0:milestone7:*:*:*:*:*:*",
      "cpe:2.3:a:apache:tomcat:9.0.0:milestone8:*:*:*:*:*:*",
      "cpe:2.3:a:apache:tomcat:9.0.0:milestone9:*:*:*:*:*:*"
    ],
    "severity": "High"
  },
  "details": "A specially crafted sequence of HTTP/2 requests sent to Apache Tomcat 10.0.0-M1 to 10.0.0-M5, 9.0.0.M1 to 9.0.35 and 8.5.0 to 8.5.55 could trigger high CPU usage for several seconds. If a sufficient number of such requests were made on concurrent HTTP/2 connections, the server could become unresponsive.",
  "id": "BIT-tomcat-2020-11996",
  "modified": "2025-11-06T13:25:46.476Z",
  "published": "2024-03-06T11:11:51.472Z",
  "references": [
    {
      "type": "WEB",
      "url": "http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00064.html"
    },
    {
      "type": "WEB",
      "url": "http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00072.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/r2529016c311ce9485e6f173446d469600fdfbb94dccadfcd9dfdac79%40%3Cusers.tomcat.apache.org%3E"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/r3ea96d8f36dd404acce83df8aeb22a9e807d6c13ca9c5dec72f872cd%40%3Cnotifications.ofbiz.apache.org%3E"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/r5541ef6b6b68b49f76fc4c45695940116da2bcbe0312ef204a00a2e0%40%3Cannounce.tomcat.apache.org%3E"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/r5a4f80a6acc6607d61dae424b643b594c6188dd4e1eff04705c10db2%40%3Cnotifications.ofbiz.apache.org%3E"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/r6c29801370a36c1a5159679269777ad0c73276d3015b8bbefea66e5c%40%3Cnotifications.ofbiz.apache.org%3E"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/r74f5a8204efe574cbfcd95b2a16236fe95beb45c4d9fee3dc789dca9%40%3Ccommits.ofbiz.apache.org%3E"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/r8f3d416c193bc9384a8a7dd368623d441f5fcaff1057115008100561%40%3Ccommits.ofbiz.apache.org%3E"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/r8f7484589454638af527182ae55ef5b628ba00c05c5b11887c922fb1%40%3Cnotifications.ofbiz.apache.org%3E"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/r93ca628ef3a4530dfe5ac49fddc795f0920a4b2a408b57a30926a42b%40%3Ccommits.ofbiz.apache.org%3E"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/r9ad911fe49450ed9405827af0e7a74104041081ff91864b1f2546bbd%40%3Cnotifications.ofbiz.apache.org%3E"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/ra7092f7492569b39b04ec0decf52628ba86c51f15efb38f5853e2760%40%3Cnotifications.ofbiz.apache.org%3E"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/rb4ee49ecc4c59620ffd5e66e84a17e526c2c3cfa95d0cd682d90d338%40%3Cnotifications.ofbiz.apache.org%3E"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/rb820f1a2a02bf07414be12c653c2ab5321fd87b9bf6c5e635c53ff4b%40%3Cnotifications.ofbiz.apache.org%3E"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/rc80b96b4b96618b2b7461cb90664a428cfd6605eea9f74e51b792542%40%3Cnotifications.ofbiz.apache.org%3E"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/rea65d6ef2e45dd1c45faae83922042732866c7b88fa109b76c83db52%40%3Cnotifications.ofbiz.apache.org%3E"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/ref0339792ac6dac1dba83c071a727ad72380899bde60f6aaad4031b9%40%3Cnotifications.ofbiz.apache.org%3E"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2020/07/msg00010.html"
    },
    {
      "type": "WEB",
      "url": "https://security.netapp.com/advisory/ntap-20200709-0002/"
    },
    {
      "type": "WEB",
      "url": "https://usn.ubuntu.com/4596-1/"
    },
    {
      "type": "WEB",
      "url": "https://www.debian.org/security/2020/dsa-4727"
    },
    {
      "type": "WEB",
      "url": "https://www.oracle.com/security-alerts/cpujan2021.html"
    },
    {
      "type": "WEB",
      "url": "https://www.oracle.com/security-alerts/cpuoct2020.html"
    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-11996"
    }
  ],
  "schema_version": "1.5.0"
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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