UBUNTU-CVE-2021-20237

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Source
https://ubuntu.com/security/CVE-2021-20237
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-20237.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2021-20237
Upstream
Downstream
Related
Published
2021-05-28T11:15:00Z
Modified
2025-07-18T16:46:36Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - low
Summary
[none]
Details

An uncontrolled resource consumption (memory leak) flaw was found in ZeroMQ's src/xpub.cpp in versions before 4.3.3. This flaw allows a remote unauthenticated attacker to send crafted PUB messages that consume excessive memory if the CURVE/ZAP authentication is disabled on the server, causing a denial of service. The highest threat from this vulnerability is to system availability.

References

Affected packages

Ubuntu:Pro:18.04:LTS / zeromq3

Package

Name
zeromq3
Purl
pkg:deb/ubuntu/zeromq3@4.2.5-1ubuntu0.2+esm2?arch=source&distro=esm-apps/bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
4.2.5-1ubuntu0.2+esm2

Affected versions

4.*

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 

{
    "binaries": [
        {
            "binary_name": "libzmq3-dev",
            "binary_version": "4.2.5-1ubuntu0.2+esm2"
        },
        {
            "binary_name": "libzmq5",
            "binary_version": "4.2.5-1ubuntu0.2+esm2"
        },
        {
            "binary_name": "libzmq5-dbgsym",
            "binary_version": "4.2.5-1ubuntu0.2+esm2"
        }
    ],
    "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
}

Ubuntu:Pro:20.04:LTS / zeromq3

Package

Name
zeromq3
Purl
pkg:deb/ubuntu/zeromq3@4.3.2-2ubuntu1.20.04.1~esm2?arch=source&distro=esm-apps/focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
4.3.2-2ubuntu1.20.04.1~esm2

Affected versions

4.*

4.3.2-1
4.3.2-2
4.3.2-2ubuntu1
4.3.2-2ubuntu1.20.04.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libzmq3-dev",
            "binary_version": "4.3.2-2ubuntu1.20.04.1~esm2"
        },
        {
            "binary_name": "libzmq5",
            "binary_version": "4.3.2-2ubuntu1.20.04.1~esm2"
        },
        {
            "binary_name": "libzmq5-dbgsym",
            "binary_version": "4.3.2-2ubuntu1.20.04.1~esm2"
        }
    ],
    "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
}