CVE-2025-47287

See a problem?
Please try reporting it to the source first.
Source
https://nvd.nist.gov/vuln/detail/CVE-2025-47287
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-47287.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2025-47287
Aliases
Related
Published
2025-05-15T22:15:18Z
Modified
2025-06-06T20:49:31.543036Z
Downstream
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

Debian:11 / python-tornado

Package

Name
python-tornado
Purl
pkg:deb/debian/python-tornado?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
6.1.0-1+deb11u2

Affected versions

6.*

6.1.0-1
6.1.0-1+deb11u1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Debian:12 / python-tornado

Package

Name
python-tornado
Purl
pkg:deb/debian/python-tornado?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
6.2.0-3+deb12u2

Affected versions

6.*

6.2.0-3
6.2.0-3+deb12u1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Debian:13 / python-tornado

Package

Name
python-tornado
Purl
pkg:deb/debian/python-tornado?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
6.4.2-2

Affected versions

6.*

6.2.0-3
6.3.2-1
6.4.0-1
6.4.0-2
6.4.1-1
6.4.1-2
6.4.1-3
6.4.2-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Git / github.com/tornadoweb/tornado

Affected ranges

Type
GIT
Repo
https://github.com/tornadoweb/tornado
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
b39b892bf78fe8fea01dd45199aa88307e7162f3

Affected versions

v1.*

v1.0.0
v1.1.0
v1.1.1
v1.2.0
v1.2.1

v2.*

v2.0.0
v2.1.0
v2.1.1
v2.2.0
v2.2.1
v2.3.0
v2.4.0
v2.4.1

v3.*

v3.0.0
v3.0.1
v3.0.2
v3.1.0
v3.1.1
v3.2.0
v3.2.0b1
v3.2.0b2
v3.2.1
v3.2.2

v4.*

v4.0.0
v4.0.0b1
v4.0.0b2
v4.0.0b3
v4.0.1
v4.0.2
v4.1.0
v4.1.0b1
v4.1.0b2
v4.2.0
v4.2.0b1
v4.2.1
v4.3.0
v4.3.0b1
v4.3.0b2
v4.4.0
v4.4.0b1
v4.4.1
v4.4.2
v4.4.3
v4.5.0
v4.5.1
v4.5.2
v4.5.3

v5.*

v5.0.0
v5.0.1
v5.1.0
v5.1.0b1

v6.*

v6.0.0
v6.0.0b1
v6.1.0
v6.1.0b1
v6.1.0b2
v6.2.0
v6.2.0b1
v6.2.0b2
v6.3.0
v6.3.0b1
v6.3.1
v6.4.0
v6.4.0b1
v6.4.1
v6.5.0b1