CVE-2023-54397
Tornado before 6.3.3 HTTP Request Smuggling via Content-Length
- State
- Published
- Severity
- 9.0 Critical
- Published
- Sep 15, 2026
- Updated
- Sep 17, 2026
- Reserved
- Sep 15, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.0 Critical | 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 | VulnCheck |
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:N | VulnCheck |
Weaknesses
- CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Affected Products
| Product | Versions |
|---|---|
tornadotornadoweb |
|
References
- GitHub Security Advisory (GHSA-qppv-j76h-2rpx)vendor-advisory
- VulnCheck Advisory: Tornado before 6.3.3 HTTP Request Smuggling via Content-Lengththird-party-advisory
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