CVEvulnerability

CVE-2025-67724

6.1 MEDIUM Published 2025-12-12 Modified 2026-10-07 Official page ↗
Status
Analyzed
Published
2025-12-12
Last modified
2026-10-07
Assigner
[email protected]
CVSS 3.1 ([email protected])
5.4 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
CVSS 3.1 ([email protected])
6.1 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weaknesses
CWE-644, CWE-79

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.

Affected configurations

• tornadoweb tornado (< 6.5.3)

Related

Weakness · CWE (2)

  • CWE-644 Improper Neutralization of HTTP Headers for Scripting Syntax weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation weakness

References