{
  "cveId": "CVE-2020-11996",
  "url": "https://patchblox.com/security/cve/CVE-2020-11996",
  "summary": "CVE-2020-11996 is fixed in 8 products on 1 platform, first by libtomcat9-embed-java 9.0.31-1ubuntu0.1, released July 14, 2020. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "libtomcat9-embed-java: 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...",
  "description": "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.",
  "published": "2020-06-26T10:15:00Z",
  "severity": "Medium",
  "epss": 0.26699,
  "epssPercentile": 0.98036,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "libtomcat9-embed-java",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "9.0.31-1ubuntu0.1",
      "fix": "libtomcat9-embed-java 9.0.31-1ubuntu0.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libtomcat9-embed-java-9.0.31-1ubuntu0.1",
      "released": "2020-07-14T08:15:00Z"
    },
    {
      "platform": "linux",
      "product": "libtomcat9-java",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "9.0.31-1ubuntu0.1",
      "fix": "libtomcat9-java 9.0.31-1ubuntu0.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libtomcat9-java-9.0.31-1ubuntu0.1",
      "released": "2020-07-14T08:15:00Z"
    },
    {
      "platform": "linux",
      "product": "tomcat9",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "9.0.31-1ubuntu0.1",
      "fix": "tomcat9 9.0.31-1ubuntu0.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-tomcat9-9.0.31-1ubuntu0.1",
      "released": "2020-07-14T08:15:00Z"
    },
    {
      "platform": "linux",
      "product": "tomcat9-admin",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "9.0.31-1ubuntu0.1",
      "fix": "tomcat9-admin 9.0.31-1ubuntu0.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-tomcat9-admin-9.0.31-1ubuntu0.1",
      "released": "2020-07-14T08:15:00Z"
    },
    {
      "platform": "linux",
      "product": "tomcat9-common",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "9.0.31-1ubuntu0.1",
      "fix": "tomcat9-common 9.0.31-1ubuntu0.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-tomcat9-common-9.0.31-1ubuntu0.1",
      "released": "2020-07-14T08:15:00Z"
    },
    {
      "platform": "linux",
      "product": "tomcat9-docs",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "9.0.31-1ubuntu0.1",
      "fix": "tomcat9-docs 9.0.31-1ubuntu0.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-tomcat9-docs-9.0.31-1ubuntu0.1",
      "released": "2020-07-14T08:15:00Z"
    },
    {
      "platform": "linux",
      "product": "tomcat9-examples",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "9.0.31-1ubuntu0.1",
      "fix": "tomcat9-examples 9.0.31-1ubuntu0.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-tomcat9-examples-9.0.31-1ubuntu0.1",
      "released": "2020-07-14T08:15:00Z"
    },
    {
      "platform": "linux",
      "product": "tomcat9-user",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "9.0.31-1ubuntu0.1",
      "fix": "tomcat9-user 9.0.31-1ubuntu0.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-tomcat9-user-9.0.31-1ubuntu0.1",
      "released": "2020-07-14T08:15:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}