{"cve":"CVE-2025-47287","nvd":{"published":"2025-05-15T22:15:18.827","modified":"2026-06-17T09:27:40.320","status":"Analyzed","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-770"],"references":["https://github.com/tornadoweb/tornado/commit/b39b892bf78fe8fea01dd45199aa88307e7162f3","https://github.com/tornadoweb/tornado/security/advisories/GHSA-7cx3-6m66-7c5m","https://lists.debian.org/debian-lts-announce/2025/05/msg00038.html"],"products":["debian:debian_linux","tornadoweb:tornado"],"source":"nvd","synced_at":"2026-10-19T22:01:57.636215869+00:00"},"epss":{"cve":"CVE-2025-47287","score":0.00745,"percentile":0.54811,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-7cx3-6m66-7c5m","url":"https://osv.dev/vulnerability/GHSA-7cx3-6m66-7c5m","summary":"Tornado vulnerable to excessive logging caused by malformed multipart form data","modified":"2026-09-10T03:50:24.284224963Z","packages":[{"ecosystem":"PyPI","name":"tornado","purl":"pkg:pypi/tornado","ranges":["<6.5"],"fixed":["6.5"]}]},{"id":"PYSEC-2026-1974","url":"https://osv.dev/vulnerability/PYSEC-2026-1974","summary":"Tornado vulnerable to excessive logging caused by malformed multipart form data","modified":"2026-07-07T17:48:11.550822648Z","packages":[{"ecosystem":"PyPI","name":"tornado","purl":"pkg:pypi/tornado","ranges":["<6.5"],"fixed":["6.5"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}