ubuntu-cve-2020-15166
Vulnerability from osv_ubuntu
Published
2020-09-11 16:15
Modified
2026-04-22 07:39
Summary
Details

In ZeroMQ before version 4.3.3, there is a denial-of-service vulnerability. Users with TCP transport public endpoints, even with CURVE/ZAP enabled, are impacted. If a raw TCP socket is opened and connected to an endpoint that is fully configured with CURVE/ZAP, legitimate clients will not be able to exchange any message. Handshakes complete successfully, and messages are delivered to the library, but the server application never receives them. This is patched in version 4.3.3.

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

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "libzmq3",
            "binary_version": "4.0.4+dfsg-2ubuntu0.1+esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:14.04:LTS",
        "name": "zeromq3",
        "purl": "pkg:deb/ubuntu/zeromq3@4.0.4+dfsg-2ubuntu0.1+esm2?arch=source\u0026distro=trusty/esm"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.0.4+dfsg-2ubuntu0.1+esm2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.2.3+dfsg-2",
        "3.2.4+dfsg-1",
        "3.2.4+dfsg-2",
        "3.2.4+dfsg-3",
        "3.2.4+dfsg-4",
        "4.0.3+dfsg-1",
        "4.0.4+dfsg-2",
        "4.0.4+dfsg-2ubuntu0.1",
        "4.0.4+dfsg-2ubuntu0.1+esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "libzmq5",
            "binary_version": "4.1.4-7ubuntu0.1+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "zeromq3",
        "purl": "pkg:deb/ubuntu/zeromq3@4.1.4-7ubuntu0.1+esm1?arch=source\u0026distro=esm-apps/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.1.4-7ubuntu0.1+esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.0.5+dfsg-3ubuntu1~gcc5.1",
        "4.0.5+dfsg-3ubuntu2",
        "4.1.4-7",
        "4.1.4-7ubuntu0.1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "libzmq5",
            "binary_version": "4.2.5-1ubuntu0.2+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "zeromq3",
        "purl": "pkg:deb/ubuntu/zeromq3@4.2.5-1ubuntu0.2+esm1?arch=source\u0026distro=esm-apps/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.2.5-1ubuntu0.2+esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.2.1-4ubuntu1",
        "4.2.2-1ubuntu2",
        "4.2.3-1",
        "4.2.3-1build1",
        "4.2.5-1",
        "4.2.5-1ubuntu0.1",
        "4.2.5-1ubuntu0.2"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "libzmq5",
            "binary_version": "4.3.2-2ubuntu1.20.04.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "zeromq3",
        "purl": "pkg:deb/ubuntu/zeromq3@4.3.2-2ubuntu1.20.04.1~esm1?arch=source\u0026distro=esm-apps/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.3.2-2ubuntu1.20.04.1~esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.3.2-1",
        "4.3.2-2",
        "4.3.2-2ubuntu1"
      ]
    }
  ],
  "aliases": [],
  "details": "In ZeroMQ before version 4.3.3, there is a denial-of-service vulnerability. Users with TCP transport public endpoints, even with CURVE/ZAP enabled, are impacted. If a raw TCP socket is opened and connected to an endpoint that is fully configured with CURVE/ZAP, legitimate clients will not be able to exchange any message. Handshakes complete successfully, and messages are delivered to the library, but the server application never receives them. This is patched in version 4.3.3.",
  "id": "UBUNTU-CVE-2020-15166",
  "modified": "2026-04-22T07:39:27Z",
  "published": "2020-09-11T16:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-15166"
    },
    {
      "type": "REPORT",
      "url": "https://www.openwall.com/lists/oss-security/2020/09/07/3"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/zeromq/libzmq/security/advisories/GHSA-25wp-cf8g-938m"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/zeromq/libzmq/commit/e7f0090b161ce6344f6bd35009816a925c070b09"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-4920-1"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2020-15166"
    }
  ],
  "related": [
    "USN-4920-1"
  ],
  "schema_version": "1.7.0",
  "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": "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"
    }
  ],
  "upstream": [
    "CVE-2020-15166"
  ]
}



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