{"id":"CVE-2023-54397","summary":"Tornado before 6.3.3 HTTP Request Smuggling via Content-Length","details":"Tornado before 6.3.3 contains an HTTP request smuggling vulnerability due to improper parsing of Content-Length headers accepting non-standard characters. Attackers can send crafted HTTP requests with these characters to bypass proxy validation and smuggle requests when deployed behind certain proxies.","aliases":["GHSA-qppv-j76h-2rpx"],"modified":"2026-09-17T03:45:07.857954130Z","published":"2026-09-15T15:17:52.261Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/54xxx/CVE-2023-54397.json","cna_assigner":"VulnCheck","cwe_ids":["CWE-444"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/54xxx/CVE-2023-54397.json"},{"type":"ADVISORY","url":"https://github.com/tornadoweb/tornado/security/advisories/GHSA-qppv-j76h-2rpx"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-54397"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/tornado-before-6.3.3-http-request-smuggling-via-content-length"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/tornadoweb/tornado","events":[{"introduced":"0"},{"fixed":"e4d698433b44f350d4908da9ca2cac475c92dfdc"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"6.3.3"}],"source":["AFFECTED_FIELD","DESCRIPTION"]}}],"versions":["v6.3.1","v6.3.0","v6.3.0b1","v6.2.0","v6.2.0b2","v6.2.0b1","v6.1.0","v6.1.0b2","v6.1.0b1","v6.0.0","v6.0.0b1","v5.1.0","v5.0.0","v4.5.0","v4.5.1","v4.4.1","v4.4.0","v4.4.0b1","v4.3.0","v4.3.0b2","v4.3.0b1","v4.2.0","v4.2.0b1","v4.1.0","v4.1.0b2","v4.1.0b1","v4.0.0","v4.0.0b3","v4.0.0b2","v4.0.0b1","v3.2.0","v3.2.0b2","v3.2.0b1","v3.1.0","v3.0.1","v3.0.0","v2.1.1","v2.3.0","v2.2.0","v2.1.0","v2.0.0","v1.2.0","v1.1.0","v1.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-54397.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:L/SI:H/SA:N"}]}