ubuntu-cve-2021-20234
Vulnerability from osv_ubuntu
Published
2021-04-01 14:15
Modified
2026-04-22 07:39
Summary
Details

An uncontrolled resource consumption (memory leak) flaw was found in the ZeroMQ client in versions before 4.3.3 in src/pipe.cpp. This issue causes a client that connects to multiple malicious or compromised servers to crash. The highest threat from this vulnerability is to system availability.

Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
N/A (UNKNOWN)
low
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+esm3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:14.04:LTS",
        "name": "zeromq3",
        "purl": "pkg:deb/ubuntu/zeromq3@4.0.4+dfsg-2ubuntu0.1+esm3?arch=source\u0026distro=trusty/esm"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.0.4+dfsg-2ubuntu0.1+esm3"
            }
          ],
          "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",
        "4.0.4+dfsg-2ubuntu0.1+esm2"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "libzmq5",
            "binary_version": "4.1.4-7ubuntu0.1+esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "zeromq3",
        "purl": "pkg:deb/ubuntu/zeromq3@4.1.4-7ubuntu0.1+esm2?arch=source\u0026distro=esm-apps/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.1.4-7ubuntu0.1+esm2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.0.5+dfsg-3ubuntu1~gcc5.1",
        "4.0.5+dfsg-3ubuntu2",
        "4.1.4-7",
        "4.1.4-7ubuntu0.1",
        "4.1.4-7ubuntu0.1+esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "libzmq5",
            "binary_version": "4.2.5-1ubuntu0.2+esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "zeromq3",
        "purl": "pkg:deb/ubuntu/zeromq3@4.2.5-1ubuntu0.2+esm2?arch=source\u0026distro=esm-apps/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.2.5-1ubuntu0.2+esm2"
            }
          ],
          "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",
        "4.2.5-1ubuntu0.2+esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "libzmq5",
            "binary_version": "4.3.2-2ubuntu1.20.04.1~esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "zeromq3",
        "purl": "pkg:deb/ubuntu/zeromq3@4.3.2-2ubuntu1.20.04.1~esm2?arch=source\u0026distro=esm-apps/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.3.2-2ubuntu1.20.04.1~esm2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.3.2-1",
        "4.3.2-2",
        "4.3.2-2ubuntu1",
        "4.3.2-2ubuntu1.20.04.1~esm1"
      ]
    }
  ],
  "aliases": [],
  "details": "An uncontrolled resource consumption (memory leak) flaw was found in the ZeroMQ client in versions before 4.3.3 in src/pipe.cpp. This issue causes a client that connects to multiple malicious or compromised servers to crash. The highest threat from this vulnerability is to system availability.",
  "id": "UBUNTU-CVE-2021-20234",
  "modified": "2026-04-22T07:39:53Z",
  "published": "2021-04-01T14:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-20234"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/zeromq/libzmq/pull/3918"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/zeromq/libzmq/security/advisories/GHSA-wfr2-29gj-5w87"
    },
    {
      "type": "REPORT",
      "url": "https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=22037"
    },
    {
      "type": "REPORT",
      "url": "https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=22123"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-4920-1"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-20234"
    }
  ],
  "related": [
    "USN-4920-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "low",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-20234"
  ]
}



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