CVE-2025-47287
python-tornado - security update
Description
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.
How to fix CVE-2025-47287
To remediate CVE-2025-47287, upgrade the affected package to a fixed version below.
- —upgrade to 6.1.0-1+deb11u2 or later
- —upgrade to 6.1.0-1+deb11u2 or later
- —upgrade to 6.2.0-3+deb12u2 or later
- —upgrade to 6.5 or later
Is CVE-2025-47287 being exploited?
Low — EPSS is 1.2%, meaning exploitation activity has not been observed at scale.
Affected packages (4)
- from 0, < 6.1.0-1+deb11u2
- from 0, < 6.1.0-1+deb11u2
- from 0, < 6.2.0-3+deb12u2
- from 0, < 6.5
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |