UBUNTU-CVE-2021-29921

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Source
https://ubuntu.com/security/CVE-2021-29921
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-29921.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2021-29921
Upstream
Downstream
Related
Published
2021-05-06T13:15:00Z
Modified
2025-09-08T16:47:06Z
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

In Python before 3,9,5, the ipaddress library mishandles leading zero characters in the octets of an IP address string. This (in some situations) allows attackers to bypass access control that is based on IP addresses.

References

Affected packages

Ubuntu:Pro:18.04:LTS / python3.8

Package

Name
python3.8
Purl
pkg:deb/ubuntu/python3.8@3.8.0-3ubuntu1~18.04.2+esm2?arch=source&distro=esm-apps/bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.8.0-3ubuntu1~18.04.2+esm2

Affected versions

3.*

3.8.0-3~18.04
3.8.0-3~18.04.1
3.8.0-3ubuntu1~18.04.2
3.8.0-3ubuntu1~18.04.2+esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "idle-python3.8",
            "binary_version": "3.8.0-3ubuntu1~18.04.2+esm2"
        },
        {
            "binary_name": "libpython3.8",
            "binary_version": "3.8.0-3ubuntu1~18.04.2+esm2"
        },
        {
            "binary_name": "libpython3.8-dev",
            "binary_version": "3.8.0-3ubuntu1~18.04.2+esm2"
        },
        {
            "binary_name": "libpython3.8-minimal",
            "binary_version": "3.8.0-3ubuntu1~18.04.2+esm2"
        },
        {
            "binary_name": "libpython3.8-stdlib",
            "binary_version": "3.8.0-3ubuntu1~18.04.2+esm2"
        },
        {
            "binary_name": "libpython3.8-testsuite",
            "binary_version": "3.8.0-3ubuntu1~18.04.2+esm2"
        },
        {
            "binary_name": "python3.8",
            "binary_version": "3.8.0-3ubuntu1~18.04.2+esm2"
        },
        {
            "binary_name": "python3.8-dev",
            "binary_version": "3.8.0-3ubuntu1~18.04.2+esm2"
        },
        {
            "binary_name": "python3.8-examples",
            "binary_version": "3.8.0-3ubuntu1~18.04.2+esm2"
        },
        {
            "binary_name": "python3.8-minimal",
            "binary_version": "3.8.0-3ubuntu1~18.04.2+esm2"
        },
        {
            "binary_name": "python3.8-venv",
            "binary_version": "3.8.0-3ubuntu1~18.04.2+esm2"
        }
    ],
    "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
}

Ubuntu:20.04:LTS / python3.8

Package

Name
python3.8
Purl
pkg:deb/ubuntu/python3.8@3.8.10-0ubuntu1~20.04.1?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.8.10-0ubuntu1~20.04.1

Affected versions

3.*

3.8.0-1
3.8.0-2
3.8.0-3
3.8.0-4
3.8.0-5
3.8.1-2ubuntu3
3.8.2~rc1-1ubuntu1
3.8.2-1
3.8.2-1ubuntu1
3.8.2-1ubuntu1.1
3.8.2-1ubuntu1.2
3.8.5-1~20.04
3.8.5-1~20.04.2
3.8.5-1~20.04.3
3.8.10-0ubuntu1~20.04

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "idle-python3.8",
            "binary_version": "3.8.10-0ubuntu1~20.04.1"
        },
        {
            "binary_name": "libpython3.8",
            "binary_version": "3.8.10-0ubuntu1~20.04.1"
        },
        {
            "binary_name": "libpython3.8-dev",
            "binary_version": "3.8.10-0ubuntu1~20.04.1"
        },
        {
            "binary_name": "libpython3.8-minimal",
            "binary_version": "3.8.10-0ubuntu1~20.04.1"
        },
        {
            "binary_name": "libpython3.8-stdlib",
            "binary_version": "3.8.10-0ubuntu1~20.04.1"
        },
        {
            "binary_name": "libpython3.8-testsuite",
            "binary_version": "3.8.10-0ubuntu1~20.04.1"
        },
        {
            "binary_name": "python3.8",
            "binary_version": "3.8.10-0ubuntu1~20.04.1"
        },
        {
            "binary_name": "python3.8-dev",
            "binary_version": "3.8.10-0ubuntu1~20.04.1"
        },
        {
            "binary_name": "python3.8-examples",
            "binary_version": "3.8.10-0ubuntu1~20.04.1"
        },
        {
            "binary_name": "python3.8-full",
            "binary_version": "3.8.10-0ubuntu1~20.04.1"
        },
        {
            "binary_name": "python3.8-minimal",
            "binary_version": "3.8.10-0ubuntu1~20.04.1"
        },
        {
            "binary_name": "python3.8-venv",
            "binary_version": "3.8.10-0ubuntu1~20.04.1"
        }
    ],
    "availability": "No subscription required"
}

Ubuntu:20.04:LTS / python3.9

Package

Name
python3.9
Purl
pkg:deb/ubuntu/python3.9@3.9.5-3~20.04.1?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.9.5-3~20.04.1

Affected versions

3.*

3.9.0~rc1-1~20.04
3.9.0-5~20.04

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "idle-python3.9",
            "binary_version": "3.9.5-3~20.04.1"
        },
        {
            "binary_name": "libpython3.9",
            "binary_version": "3.9.5-3~20.04.1"
        },
        {
            "binary_name": "libpython3.9-dev",
            "binary_version": "3.9.5-3~20.04.1"
        },
        {
            "binary_name": "libpython3.9-minimal",
            "binary_version": "3.9.5-3~20.04.1"
        },
        {
            "binary_name": "libpython3.9-stdlib",
            "binary_version": "3.9.5-3~20.04.1"
        },
        {
            "binary_name": "libpython3.9-testsuite",
            "binary_version": "3.9.5-3~20.04.1"
        },
        {
            "binary_name": "python3.9",
            "binary_version": "3.9.5-3~20.04.1"
        },
        {
            "binary_name": "python3.9-dev",
            "binary_version": "3.9.5-3~20.04.1"
        },
        {
            "binary_name": "python3.9-examples",
            "binary_version": "3.9.5-3~20.04.1"
        },
        {
            "binary_name": "python3.9-full",
            "binary_version": "3.9.5-3~20.04.1"
        },
        {
            "binary_name": "python3.9-minimal",
            "binary_version": "3.9.5-3~20.04.1"
        },
        {
            "binary_name": "python3.9-venv",
            "binary_version": "3.9.5-3~20.04.1"
        }
    ],
    "availability": "No subscription required"
}