CVE-2024-14029

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{"bugzilla": {"description": "python-tornado: Tornado before 6.4.1 HTTP Request Smuggling via Transfer-Encoding", "id": "2533918", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2533918"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:N", "status": "draft"}, "cwe": "CWE-444", "details": ["Tornado before 6.4.1 ignores duplicate Transfer-Encoding: chunked headers, treating requests as having no message body and parsing the chunked body as a subsequent request. Attackers can exploit this inconsistency when Tornado is deployed behind proxies to perform HTTP request smuggling, enabling access control bypass, cache poisoning, or connection desynchronization.", "A vulnerability was discovered in Tornado where it improperly handles HTTP requests containing duplicate Transfer-Encoding: chunked headers. When duplicate Transfer-Encoding headers are present in an incoming request, Tornado ignores them and treats the request as body-less, leaving the chunked message body unparsed in the HTTP socket stream. When Tornado is deployed behind a reverse proxy or load balancer that correctly processes chunked payloads, an unauthenticated remote attacker can exploit this parsing discrepancy to conduct HTTP request smuggling, bypass proxy security restrictions, poison intermediate caches, or desynchronize backend connections."], "mitigation": {"lang": "en:us", "value": "Configure upstream reverse proxies or load balancers to strictly normalize HTTP headers and reject any incoming requests containing duplicate Transfer-Encoding headers before they reach the backend Tornado application worker."}, "name": "CVE-2024-14029", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "python-tornado", "product_name": "Red Hat Enterprise Linux 7"}], "public_date": "2026-09-15T15:17:52Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-14029\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-14029\nhttps://github.com/tornadoweb/tornado/security/advisories/GHSA-753j-mpmx-qq6g\nhttps://www.vulncheck.com/advisories/tornado-before-6.4.1-http-request-smuggling-via-transfer-encoding"], "statement": "A flaw was found in Tornado's HTTP request header processing. When processing HTTP requests containing duplicate Transfer-Encoding: chunked headers, Tornado ignores the headers and treats the request as body-less, leaving the chunked body unparsed in the stream. When deployed behind a front-end proxy or load balancer, an unauthenticated remote attacker can exploit this parsing discrepancy to conduct HTTP request smuggling, bypass proxy-level security controls, poison intermediate caches, or cause connection desynchronization.", "threat_severity": "Important"}

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