usn-4596-1
Vulnerability from osv_ubuntu
Published
2020-10-21 13:55
Modified
2026-04-27 14:11
Summary
tomcat9 vulnerabilities
Details

It was discovered that Tomcat did not properly manage HTTP/2 streams. An attacker could possibly use this to cause Tomcat to consume resources, resulting in a denial of service. (CVE-2020-11996)

It was discovered that Tomcat did not properly release the HTTP/1.1 processor after the upgrade to HTTP/2. An attacker could possibly use this to generate an OutOfMemoryException, resulting in a denial of service. (CVE-2020-13934)

It was discovered that Tomcat did not properly validate the payload length in a WebSocket frame. An attacker could possibly use this to trigger an infinite loop, resulting in a denial of service. (CVE-2020-13935)

It was discovered that Tomcat did not properly deserialize untrusted data. An attacker could possibly use this issue to execute arbitrary code. (CVE-2020-9484)

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2020-9484",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2020-11996",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2020-13934",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2020-13935",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:20.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libtomcat9-embed-java",
            "binary_version": "9.0.31-1ubuntu0.1"
          },
          {
            "binary_name": "libtomcat9-java",
            "binary_version": "9.0.31-1ubuntu0.1"
          },
          {
            "binary_name": "tomcat9",
            "binary_version": "9.0.31-1ubuntu0.1"
          },
          {
            "binary_name": "tomcat9-admin",
            "binary_version": "9.0.31-1ubuntu0.1"
          },
          {
            "binary_name": "tomcat9-common",
            "binary_version": "9.0.31-1ubuntu0.1"
          },
          {
            "binary_name": "tomcat9-docs",
            "binary_version": "9.0.31-1ubuntu0.1"
          },
          {
            "binary_name": "tomcat9-examples",
            "binary_version": "9.0.31-1ubuntu0.1"
          },
          {
            "binary_name": "tomcat9-user",
            "binary_version": "9.0.31-1ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "tomcat9",
        "purl": "pkg:deb/ubuntu/tomcat9@9.0.31-1ubuntu0.1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "9.0.31-1ubuntu0.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "9.0.24-1",
        "9.0.27-1",
        "9.0.31-1"
      ]
    }
  ],
  "aliases": [],
  "details": "It was discovered that Tomcat did not properly manage HTTP/2 streams. An \nattacker could possibly use this to cause Tomcat to consume resources, \nresulting in a denial of service. (CVE-2020-11996)\n\nIt was discovered that Tomcat did not properly release the HTTP/1.1 \nprocessor after the upgrade to HTTP/2. An attacker could possibly use this\nto generate an OutOfMemoryException, resulting in a denial of service. \n(CVE-2020-13934)\n\nIt was discovered that Tomcat did not properly validate the payload length\nin a WebSocket frame. An attacker could possibly use this to trigger an\ninfinite loop, resulting in a denial of service. (CVE-2020-13935)\n\nIt was discovered that Tomcat did not properly deserialize untrusted data.\nAn attacker could possibly use this issue to execute arbitrary code.\n(CVE-2020-9484)\n",
  "id": "USN-4596-1",
  "modified": "2026-04-27T14:11:26Z",
  "published": "2020-10-21T13:55:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-4596-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-9484"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-11996"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-13934"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-13935"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "tomcat9 vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2020-9484",
    "UBUNTU-CVE-2020-11996",
    "UBUNTU-CVE-2020-13934",
    "UBUNTU-CVE-2020-13935"
  ]
}



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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.
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