CVE & CISA-KEV Catalog

CVE-2025-67724

MEDIUM
5.4
CVSS v3
NVD

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.

CWE-79Cross-Site Scripting (XSS)CWE-644

How to fix

Remediation Available
python-tornadoDebian
Fixed in:6.1.0-1+deb11u3CVE-2025-67724
Fixed in:6.2.0-3+deb12u4CVE-2025-67724
Fixed in:6.4.2-3+deb13u2CVE-2025-67724
Fixed in:6.5.4-0.1CVE-2025-67724
python-tornadoUbuntu
Fixed in:4.2.1-1ubuntu3.1+esm2USN-7950-1
Fixed in:4.5.3-1ubuntu0.2+esm2USN-7950-1
Fixed in:6.0.3+really5.1.1-3ubuntu0.1~esm3USN-7950-1
Fixed in:6.1.0-3ubuntu0.1~esm4USN-7950-1
Fixed in:6.4.0-1ubuntu0.4USN-7950-1
Fixed in:6.4.2-3ubuntu0.2USN-7950-1
python3-tornadoUbuntu
Fixed in:4.2.1-1ubuntu3.1+esm2USN-7950-1
Fixed in:4.5.3-1ubuntu0.2+esm2USN-7950-1
Fixed in:6.0.3+really5.1.1-3ubuntu0.1~esm3USN-7950-1
Fixed in:6.1.0-3ubuntu0.1~esm4USN-7950-1
Fixed in:6.4.0-1ubuntu0.4USN-7950-1
Fixed in:6.4.2-3ubuntu0.2USN-7950-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionRequired
ScopeUnchanged

Impact

ConfidentialityLow
IntegrityLow
AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Exploit Intelligence

0.18%probability of exploitation in 30 days
8thpercentile

Low risk: more likely to be exploited than 8% of all known CVEs.

References

Vendor Advisory1
Release Notes1
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Markdown

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-12-22.