CVE-2025-47287 – tornado

Package

Manager: pip
Name: tornado
Vulnerable Version: >=0 <6.5

Severity

Level: High

CVSS v3.1: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

EPSS: 0.00118 pctl0.31373

Details

Tornado vulnerable to excessive logging caused by malformed multipart form data ### Summary 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. ### Affected versions All versions of Tornado prior to 6.5 are affected. The vulnerable parser is enabled by default. ### Solution Upgrade to Tornado version 6.5. In the meantime, risk can be mitigated by blocking `Content-Type: multipart/form-data` in a proxy.

Metadata

Created: 2025-05-16T14:12:40Z
Modified: 2025-05-29T06:31:17Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/05/GHSA-7cx3-6m66-7c5m/GHSA-7cx3-6m66-7c5m.json
CWE IDs: ["CWE-770"]
Alternative ID: GHSA-7cx3-6m66-7c5m
Finding: F029
Auto approve: 1