Is CVE-2025-67724 actively exploited?

CVE-2025-67724 has no public evidence of in-the-wild exploitation as of 2025-12-22.

What is the CVSS score for CVE-2025-67724?

CVE-2025-67724 has a CVSS score of 5.4 (MEDIUM severity). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.

How do I patch CVE-2025-67724?

Patch guidance is available from tornadoweb security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2025-67724.

CVE-2025-67724 - remediation guidance & executive summary

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.

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Attack Vector: network
Complexity: low
Privileges: none
User Action: required
Scope: unchanged
Confidentiality: low
Integrity: low
Availability: none
Weaknesses: CWE-79 · Cross-site Scripting (XSS)CWE-644

Metadata

Primary Vendor: TORNADOWEB
Published: 12/12/2025
Last Modified: 12/22/2025
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

tornadoweb : tornado

Remediation Guidance

Executive Summary

Cite this page

CVE-2025-67724. CVEDatabase.com. Retrieved 1 May 2026. https://cvedatabase.com/cve/CVE-2025-67724

View on NIST NVD

CVE-2025-67724 vulnerability