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CVE-2023-54397— Tornado before 6.3.3 HTTP Request Smuggling via Content-Length

Quick assessment

Affected
tornadoweb tornado
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Tornado 6.3.3 之前版本存在一个 HTTP 请求走私漏洞，原因是其对 Content-Length 请求头的解析不当，接受了非标准字符。攻击者可以发送包含这些非标准字符的恶意构造 HTTP 请求，以绕过某些代理服务器的验证，并在部署于特定代理后方时实现请求走私。

CVSS 7.5 · High
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I. Basic Information for CVE-2023-54397

Vulnerability Information
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Vulnerability Title
Tornado before 6.3.3 HTTP Request Smuggling via Content-Length
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
tornadoweb tornado 0 ~ 6.3.3 -

II. Public POCs for CVE-2023-54397

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III. Intelligence Information for CVE-2023-54397

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Vendor Advisories for CVE-2023-54397 (2)

Same Patch Batch · tornadoweb · 2026-09-15 · 6 CVEs total

CVE-2026-91990 7.5 HIGH Tornado before 6.5.8 Memory Amplification DoS via multipart
CVE-2024-14029 7.5 HIGH Tornado before 6.4.1 HTTP Request Smuggling via Transfer-Encoding
CVE-2026-91992 5.9 MEDIUM Tornado before 6.5.7 Credential Leak via Handle Reuse
CVE-2026-91991 5.4 MEDIUM Tornado before 6.5.8 Cookie Attribute Injection via Capitalized kwargs
CVE-2024-58384 5.4 MEDIUM Tornado before 6.4.1 CRLF Injection via CurlAsyncHTTPClient

IV. Related Vulnerabilities

Same product: tornado
Same vendor: tornadoweb
Same weakness: CWE-444

V. Comments for CVE-2023-54397

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