CVE-2023-54397Tornado before 6.3.3 HTTP Request Smuggling via Content-Length
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:N
- Weakness (CWE)
- CWE-444
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Deferred
- Record last updated
- Sep 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
tornadoweb tornado tornadoweb:tornado (from the name) | before 6.3.3; 6.3.3 not affected | CNA record |
References
- https://github.com/tornadoweb/tornado/security/advisories/GHSA-qppv-j76h-2rpxvendor-advisory
- https://www.vulncheck.com/advisories/tornado-before-6.3.3-http-request-smuggling-via-content-lengththird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.