ubuntu-cve-2020-17527
Vulnerability from osv_ubuntu
Published
2020-12-03 19:15
Modified
2025-09-08 16:46
Summary
Details

While investigating bug 64830 it was discovered that Apache Tomcat 10.0.0-M1 to 10.0.0-M9, 9.0.0-M1 to 9.0.39 and 8.5.0 to 8.5.59 could re-use an HTTP request header value from the previous stream received on an HTTP/2 connection for the request associated with the subsequent stream. While this would most likely lead to an error and the closure of the HTTP/2 connection, it is possible that information could leak between requests.

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libtomcat9-embed-java",
            "binary_version": "9.0.16-3ubuntu0.18.04.2"
          },
          {
            "binary_name": "libtomcat9-java",
            "binary_version": "9.0.16-3ubuntu0.18.04.2"
          },
          {
            "binary_name": "tomcat9",
            "binary_version": "9.0.16-3ubuntu0.18.04.2"
          },
          {
            "binary_name": "tomcat9-admin",
            "binary_version": "9.0.16-3ubuntu0.18.04.2"
          },
          {
            "binary_name": "tomcat9-common",
            "binary_version": "9.0.16-3ubuntu0.18.04.2"
          },
          {
            "binary_name": "tomcat9-docs",
            "binary_version": "9.0.16-3ubuntu0.18.04.2"
          },
          {
            "binary_name": "tomcat9-examples",
            "binary_version": "9.0.16-3ubuntu0.18.04.2"
          },
          {
            "binary_name": "tomcat9-user",
            "binary_version": "9.0.16-3ubuntu0.18.04.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "tomcat9",
        "purl": "pkg:deb/ubuntu/tomcat9@9.0.16-3ubuntu0.18.04.2?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "9.0.16-3ubuntu0.18.04.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "9.0.16-3~18.04.1",
        "9.0.16-3ubuntu0.18.04.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libtomcat8-embed-java",
            "binary_version": "8.5.39-1ubuntu1~18.04.3+esm5"
          },
          {
            "binary_name": "libtomcat8-java",
            "binary_version": "8.5.39-1ubuntu1~18.04.3+esm5"
          },
          {
            "binary_name": "tomcat8",
            "binary_version": "8.5.39-1ubuntu1~18.04.3+esm5"
          },
          {
            "binary_name": "tomcat8-admin",
            "binary_version": "8.5.39-1ubuntu1~18.04.3+esm5"
          },
          {
            "binary_name": "tomcat8-common",
            "binary_version": "8.5.39-1ubuntu1~18.04.3+esm5"
          },
          {
            "binary_name": "tomcat8-docs",
            "binary_version": "8.5.39-1ubuntu1~18.04.3+esm5"
          },
          {
            "binary_name": "tomcat8-examples",
            "binary_version": "8.5.39-1ubuntu1~18.04.3+esm5"
          },
          {
            "binary_name": "tomcat8-user",
            "binary_version": "8.5.39-1ubuntu1~18.04.3+esm5"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "tomcat8",
        "purl": "pkg:deb/ubuntu/tomcat8@8.5.39-1ubuntu1~18.04.3+esm5?arch=source\u0026distro=esm-apps/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "8.5.21-1ubuntu1",
        "8.5.29-1",
        "8.5.30-1",
        "8.5.30-1ubuntu1",
        "8.5.30-1ubuntu1.2",
        "8.5.30-1ubuntu1.3",
        "8.5.30-1ubuntu1.4",
        "8.5.39-1ubuntu1~18.04.1",
        "8.5.39-1ubuntu1~18.04.2",
        "8.5.39-1ubuntu1~18.04.3",
        "8.5.39-1ubuntu1~18.04.3+esm1",
        "8.5.39-1ubuntu1~18.04.3+esm2",
        "8.5.39-1ubuntu1~18.04.3+esm3",
        "8.5.39-1ubuntu1~18.04.3+esm4",
        "8.5.39-1ubuntu1~18.04.3+esm5"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libtomcat9-embed-java",
            "binary_version": "9.0.31-1ubuntu0.2"
          },
          {
            "binary_name": "libtomcat9-java",
            "binary_version": "9.0.31-1ubuntu0.2"
          },
          {
            "binary_name": "tomcat9",
            "binary_version": "9.0.31-1ubuntu0.2"
          },
          {
            "binary_name": "tomcat9-admin",
            "binary_version": "9.0.31-1ubuntu0.2"
          },
          {
            "binary_name": "tomcat9-common",
            "binary_version": "9.0.31-1ubuntu0.2"
          },
          {
            "binary_name": "tomcat9-docs",
            "binary_version": "9.0.31-1ubuntu0.2"
          },
          {
            "binary_name": "tomcat9-examples",
            "binary_version": "9.0.31-1ubuntu0.2"
          },
          {
            "binary_name": "tomcat9-user",
            "binary_version": "9.0.31-1ubuntu0.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "tomcat9",
        "purl": "pkg:deb/ubuntu/tomcat9@9.0.31-1ubuntu0.2?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "9.0.31-1ubuntu0.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "9.0.24-1",
        "9.0.27-1",
        "9.0.31-1",
        "9.0.31-1ubuntu0.1"
      ]
    }
  ],
  "aliases": [],
  "details": "While investigating bug 64830 it was discovered that Apache Tomcat 10.0.0-M1 to 10.0.0-M9, 9.0.0-M1 to 9.0.39 and 8.5.0 to 8.5.59 could re-use an HTTP request header value from the previous stream received on an HTTP/2 connection for the request associated with the subsequent stream. While this would most likely lead to an error and the closure of the HTTP/2 connection, it is possible that information could leak between requests.",
  "id": "UBUNTU-CVE-2020-17527",
  "modified": "2025-09-08T16:46:16Z",
  "published": "2020-12-03T19:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-17527"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/apache/tomcat/commit/d56293f816d6dc9e2b47107f208fa9e95db58c65"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/apache/tomcat/commit/21e3408671aac7e0d7e264e720cac8b1b189eb29"
    },
    {
      "type": "REPORT",
      "url": "http://www.openwall.com/lists/oss-security/2020/12/03/3"
    },
    {
      "type": "REPORT",
      "url": "https://lists.apache.org/thread.html/r8a227ac6a755a6406c1cc47dd48800e973d4cf13fe7fe68ac59c679c@%3Cdev.tomcat.apache.org%3E"
    },
    {
      "type": "REPORT",
      "url": "https://lists.apache.org/thread.html/raa0e9ad388c1e6fd1e301b5e080f9439f64cb4178119a86a4801cc53@%3Cdev.tomcat.apache.org%3E"
    },
    {
      "type": "REPORT",
      "url": "https://lists.apache.org/thread.html/rce5ac9a40173651d540babce59f6f3825f12c6d4e886ba00823b11e5%40%3Cannounce.tomcat.apache.org%3E"
    },
    {
      "type": "REPORT",
      "url": "https://lists.apache.org/thread.html/rce5ac9a40173651d540babce59f6f3825f12c6d4e886ba00823b11e5@%3Cannounce.apache.org%3E"
    },
    {
      "type": "REPORT",
      "url": "https://lists.apache.org/thread.html/rce5ac9a40173651d540babce59f6f3825f12c6d4e886ba00823b11e5@%3Cannounce.tomcat.apache.org%3E"
    },
    {
      "type": "REPORT",
      "url": "https://lists.apache.org/thread.html/rd5babd13d7a350b369b2f647b4dd32ce678af42f9aba5389df1ae6ca@%3Cusers.tomcat.apache.org%3E"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5360-1"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2020-17527"
    }
  ],
  "related": [
    "USN-5360-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2020-17527"
  ]
}



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Nomenclature

  • 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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