UBUNTU-CVE-2025-47287

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Source
https://ubuntu.com/security/CVE-2025-47287
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-47287.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2025-47287
Related
Published
2025-05-16T00:00:00Z
Modified
2025-05-16T16:37:44Z
Summary
[none]
Details

Tornado is a Python web framework and asynchronous networking library. When Tornado's multipart/form-data parser encounters certain errors, it logs a warning but continues trying to parse the remainder of the data. This allows remote attackers to generate an extremely high volume of logs, constituting a DoS attack. This DoS is compounded by the fact that the logging subsystem is synchronous. All versions of Tornado prior to 6.5.0 are affected. The vulnerable parser is enabled by default. Upgrade to Tornado version 6.50 to receive a patch. As a workaround, risk can be mitigated by blocking Content-Type: multipart/form-data in a proxy.

References

Affected packages

Ubuntu:Pro:16.04:LTS / python-tornado

Package

Name
python-tornado
Purl
pkg:deb/ubuntu/python-tornado@4.2.1-1ubuntu3.1+esm1?arch=source&distro=esm-infra/xenial

Affected ranges

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

Affected versions

4.*

4.2.1-1ubuntu2
4.2.1-1ubuntu3
4.2.1-1ubuntu3.1
4.2.1-1ubuntu3.1+esm1

Ecosystem specific 

{
    "ubuntu_priority": "medium"
}

Ubuntu:Pro:18.04:LTS / python-tornado

Package

Name
python-tornado
Purl
pkg:deb/ubuntu/python-tornado@4.5.3-1ubuntu0.2+esm1?arch=source&distro=esm-apps/bionic

Affected ranges

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

Affected versions

4.*

4.5.1-2.1~build2
4.5.2-1
4.5.3-1
4.5.3-1ubuntu0.1
4.5.3-1ubuntu0.2
4.5.3-1ubuntu0.2+esm1

Ecosystem specific 

{
    "ubuntu_priority": "medium"
}

Ubuntu:20.04:LTS / python-tornado

Package

Name
python-tornado
Purl
pkg:deb/ubuntu/python-tornado@6.0.3+really5.1.1-3?arch=source&distro=focal

Affected ranges

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

Affected versions

5.*

5.1.1-4ubuntu1
5.1.1-4ubuntu5

6.*

6.0.3+really5.1.1-2
6.0.3+really5.1.1-2build1
6.0.3+really5.1.1-2build2
6.0.3+really5.1.1-3

Ecosystem specific 

{
    "ubuntu_priority": "medium"
}

Ubuntu:22.04:LTS / python-tornado

Package

Name
python-tornado
Purl
pkg:deb/ubuntu/python-tornado@6.1.0-3build1?arch=source&distro=jammy

Affected ranges

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

Affected versions

6.*

6.1.0-1build1
6.1.0-2
6.1.0-3
6.1.0-3build1

Ecosystem specific 

{
    "ubuntu_priority": "medium"
}

Ubuntu:24.10 / python-tornado

Package

Name
python-tornado
Purl
pkg:deb/ubuntu/python-tornado@6.4.1-2ubuntu0.1?arch=source&distro=oracular

Affected ranges

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

Affected versions

6.*

6.4.0-1build1
6.4.0-2
6.4.1-1
6.4.1-2
6.4.1-2ubuntu0.1

Ecosystem specific 

{
    "ubuntu_priority": "medium"
}

Ubuntu:24.04:LTS / python-tornado

Package

Name
python-tornado
Purl
pkg:deb/ubuntu/python-tornado@6.4.0-1ubuntu0.1?arch=source&distro=noble

Affected ranges

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

Affected versions

6.*

6.3.2-1
6.4.0-0ubuntu1
6.4.0-1
6.4.0-1build1
6.4.0-1ubuntu0.1

Ecosystem specific 

{
    "ubuntu_priority": "medium"
}

Ubuntu:25.04 / python-tornado

Package

Name
python-tornado
Purl
pkg:deb/ubuntu/python-tornado@6.4.2-1?arch=source&distro=plucky

Affected ranges

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

Affected versions

6.*

6.4.1-2
6.4.1-3
6.4.2-1

Ecosystem specific 

{
    "ubuntu_priority": "medium"
}