UBUNTU-CVE-2021-20236

See a problem?
Please try reporting it to the source first.
Source
https://ubuntu.com/security/CVE-2021-20236
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-20236.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2021-20236
Upstream
Published
2021-05-28T11:15:00Z
Modified
2026-04-22T12:45:34Z
Severity
  • 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

A flaw was found in the ZeroMQ server in versions before 4.3.3. This flaw allows a malicious client to cause a stack buffer overflow on the server by sending crafted topic subscription requests and then unsubscribing. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

References

Affected packages

Ubuntu:Pro:14.04:LTS / zeromq3

Package

Name
zeromq3
Purl
pkg:deb/ubuntu/zeromq3@4.0.4+dfsg-2ubuntu0.1+esm3?arch=source&distro=esm-infra-legacy/trusty

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

3.*
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.*
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
4.0.4+dfsg-2ubuntu0.1+esm3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libzmq3",
            "binary_version": "4.0.4+dfsg-2ubuntu0.1+esm3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-20236.json"

Ubuntu:Pro:16.04:LTS / zeromq3

Package

Name
zeromq3
Purl
pkg:deb/ubuntu/zeromq3@4.1.4-7ubuntu0.1+esm2?arch=source&distro=esm-apps/xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

4.*
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
4.1.4-7ubuntu0.1+esm2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libzmq5",
            "binary_version": "4.1.4-7ubuntu0.1+esm2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-20236.json"

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
0 Unknown introduced version / All previous versions are affected

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
4.2.5-1ubuntu0.2+esm2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libzmq5",
            "binary_version": "4.2.5-1ubuntu0.2+esm2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-20236.json"

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
0 Unknown introduced version / All previous versions are affected

Affected versions

4.*
4.3.2-1
4.3.2-2
4.3.2-2ubuntu1
4.3.2-2ubuntu1.20.04.1~esm1
4.3.2-2ubuntu1.20.04.1~esm2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libzmq5",
            "binary_version": "4.3.2-2ubuntu1.20.04.1~esm2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-20236.json"