CVE-2025-47287

Publication date 15 May 2025

Last updated 4 June 2025

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

7.5 · High

Score breakdown

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.

Read the notes from the security team

Status

Package Ubuntu Release Status
python-tornado 25.04 plucky
Fixed 6.4.2-1ubuntu0.25.04.1
24.10 oracular
Fixed 6.4.1-2ubuntu0.2
24.04 LTS noble
Fixed 6.4.0-1ubuntu0.2
22.04 LTS jammy
Fixed 6.1.0-3ubuntu0.1~esm2
20.04 LTS focal Ignored change too intrusive
18.04 LTS bionic Ignored change too intrusive
16.04 LTS xenial Ignored change too intrusive

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Notes

shishirsub10

test failed by the patch in releases below focal, using a pre-patch to fix the test breaks the functionality

Severity score breakdown

Parameter Value
Base score 7.5 · High
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H