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This DoS is compounded by the fact that the logging subsystem is synchronous.\n\n### Affected versions\n\nAll versions of Tornado prior to 6.5 are affected. The vulnerable parser is enabled by default.\n\n### Solution\n\nUpgrade to Tornado version 6.5. In the meantime, risk can be mitigated by blocking `Content-Type: multipart/form-data` in a proxy.","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-47287.json","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}],"url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-47287.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2025-47287","reference_id":"","reference_type":"","scores":[{"value":"0.01164","scoring_system":"epss","scoring_elements":"0.78693","published_at":"2026-04-29T12:55:00Z"},{"value":"0.01164","scoring_system":"epss","scoring_elements":"0.78571","published_at":"2026-04-02T12:55:00Z"},{"value":"0.01164","scoring_system":"epss","scoring_elements":"0.78603","published_at":"2026-04-04T12:55:00Z"},{"value":"0.01164","scoring_system":"epss","scoring_elements":"0.78584","published_at":"2026-04-07T12:55:00Z"},{"value":"0.01164","scoring_system":"epss","scoring_elements":"0.78609","published_at":"2026-04-08T12:55:00Z"},{"value":"0.01164","scoring_system":"epss","scoring_elements":"0.78616","published_at":"2026-04-09T12:55:00Z"},{"value":"0.01164","scoring_system":"epss","scoring_elements":"0.7864","published_at":"2026-04-11T12:55:00Z"},{"value":"0.01164","scoring_system":"epss","scoring_elements":"0.78622","published_at":"2026-04-12T12:55:00Z"},{"value":"0.01164","scoring_system":"epss","scoring_elements":"0.78614","published_at":"2026-04-13T12:55:00Z"},{"value":"0.01164","scoring_system":"epss","scoring_elements":"0.78643","published_at":"2026-04-16T12:55:00Z"},{"value":"0.01164","scoring_system":"epss","scoring_elements":"0.78641","published_at":"2026-04-18T12:55:00Z"},{"value":"0.01164","scoring_system":"epss","scoring_elements":"0.78638","published_at":"2026-04-21T12:55:00Z"},{"value":"0.01164","scoring_system":"epss","scoring_elements":"0.78668","published_at":"2026-04-24T12:55:00Z"},{"value":"0.01164","scoring_system":"epss","scoring_elements":"0.78676","published_at":"2026-04-26T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2025-47287"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-47287","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-47287"},{"reference_url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}],"url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml"},{"reference_url":"https://github.com/tornadoweb/tornado","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/tornadoweb/tornado"},{"reference_url":"https://github.com/tornadoweb/tornado/commit/b39b892bf78fe8fea01dd45199aa88307e7162f3","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2025-05-16T13:36:22Z/"}],"url":"https://github.com/tornadoweb/tornado/commit/b39b892bf78fe8fea01dd45199aa88307e7162f3"},{"reference_url":"https://github.com/tornadoweb/tornado/security/advisories/GHSA-7cx3-6m66-7c5m","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"HIGH","scoring_system":"cvssv3.1_qr","scoring_elements":""},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2025-05-16T13:36:22Z/"}],"url":"https://github.com/tornadoweb/tornado/security/advisories/GHSA-7cx3-6m66-7c5m"},{"reference_url":"https://lists.debian.org/debian-lts-announce/2025/05/msg00038.html","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://lists.debian.org/debian-lts-announce/2025/05/msg00038.html"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2025-47287","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-47287"},{"reference_url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1105886","reference_id":"1105886","reference_type":"","scores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