Allocation of Resources Without Limits or Throttling Affecting tornado package, versions [,6.5)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-PYTHON-TORNADO-10176059
- published16 May 2025
- disclosed15 May 2025
- creditStartr4ck
Introduced: 15 May 2025
NewCVE-2025-47287 (opens in a new tab)How to fix?
Upgrade tornado to version 6.5 or higher.
Overview
tornado is a Python web framework and asynchronous networking library, originally developed at FriendFeed.
Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling through the multipart/form-data parser. An attacker can generate an extremely high volume of logs, leading to a denial of service by sending malformed multipart form data that triggers continuous error logging.
Note:
This is only exploitable if the logging subsystem is synchronous.
Workaround
This vulnerability can be mitigated by blocking Content-Type: multipart/form-data in a proxy.