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CVE-2025-67724— Tornado vulnerable to Header Injection and XSS via reason argument

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是中国龙卷风科技（Tornado）社区的一个Python Web框架和异步网络库。该库通过使用非阻塞网络I / O，可以扩展到成千上万的开放连接，使其非常适合 长时间轮询， WebSocket和其他需要与每个用户建立长期连接的应用程序。 Tornado 6.5.2及之前版本存在安全漏洞，该漏洞源于HTTP头中未转义reason短语，可能导致头注入或跨站脚本攻击。

CVSS 5.4 · Medium EPSS 0.24% · P14
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I. Basic Information for CVE-2025-67724

Vulnerability Information
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Vulnerability Title
Tornado vulnerable to Header Injection and XSS via reason argument
Source: CVE Program / CVE List V5
Vulnerability Description
Tornado is a Python web framework and asynchronous networking library. In versions 6.5.2 and below, the supplied reason phrase is used unescaped in HTTP headers (where it could be used for header injection) or in HTML in the default error page (where it could be used for XSS) and can be exploited by passing untrusted or malicious data into the reason argument. Used by both RequestHandler.set_status and tornado.web.HTTPError, the argument is designed to allow applications to pass custom "reason" phrases (the "Not Found" in HTTP/1.1 404 Not Found) to the HTTP status line (mainly for non-standard status codes). This issue is fixed in version 6.5.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Tornado 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Tornado是中国龙卷风科技（Tornado）社区的一个Python Web框架和异步网络库。该库通过使用非阻塞网络I / O，可以扩展到成千上万的开放连接，使其非常适合 长时间轮询， WebSocket和其他需要与每个用户建立长期连接的应用程序。 Tornado 6.5.2及之前版本存在安全漏洞，该漏洞源于HTTP头中未转义reason短语，可能导致头注入或跨站脚本攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
tornadoweb tornado < 6.5.3 -

II. Public POCs for CVE-2025-67724

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III. Intelligence Information for CVE-2025-67724

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Patches & Fixes for CVE-2025-67724 (1)

Vendor Advisories for CVE-2025-67724 (1)

Other References for CVE-2025-67724 (1)

Same Patch Batch · tornadoweb · 2025-12-12 · 3 CVEs total

CVE-2025-67725 7.5 HIGH Tornado is Vulnerable to Quadratic DoS via Repeated Header Coalescing
CVE-2025-67726 7.5 HIGH Tornado is Vulnerable to Quadratic DoS via Crafted Multipart Parameters

IV. Related Vulnerabilities

Same product: tornado
Same vendor: tornadoweb
Same weakness: CWE-79

V. Comments for CVE-2025-67724

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