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HIGH

CVE-2025-47287

CVSS v3

7.5

HIGH

EPSS Score

0.7 %

exploit probability, as of 2026-10-20

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • tornadoPyPIall versions · fixed in 6.5
  • pcsAlmaLinux:8all versions · fixed in 0.10.18-2.el8_10.5.alma.1and 1 other package
  • python3-tornadoAlmaLinux:10all versions · fixed in 6.4.2-1.el10_0.1
  • python3-tornadoAlmaLinux:9all versions · fixed in 6.4.2-2.el9_6.2

Vendor advisories

  • CVE-2025-47287 Red Hat Product Security132 products fixed · 3 known affected

    tornado: Tornado Multipart Form-Data Denial of Service

    pcs as a component of Red Hat Enterprise Linux 9 · pcs-snmp as a component of Red Hat Enterprise Linux 9 · pcs.src as a component of Red Hat Enterprise Linux 9

  • RHSA-2025:8664 Red Hat Product Security13 products fixed

    Red Hat Security Advisory: python-tornado security update

  • RHSA-2025:8323 Red Hat Product Security11 products fixed

    Red Hat Security Advisory: pcs security update

  • RHSA-2025:8291 Red Hat Product Security16 products fixed

    Red Hat Security Advisory: pcs security update

  • RHSA-2025:8290 Red Hat Product Security8 products fixed

    Red Hat Security Advisory: pcs security update

  • RHSA-2025:8279 Red Hat Product Security16 products fixed

    Red Hat Security Advisory: pcs security update

5 more advisories

Full record on NVD

Description

Tornado is a Python web framework and asynchronous networking library. When Tornado's ``multipart/form-data`` parser encounters certain errors, it logs a warning but continues trying to parse the remainder of the data. This allows remote attackers to generate an extremely high volume of logs, constituting a DoS attack. This DoS is compounded by the fact that the logging subsystem is synchronous. All versions of Tornado prior to 6.5.0 are affected. The vulnerable parser is enabled by default. Upgrade to Tornado version 6.50 to receive a patch. As a workaround, risk can be mitigated by blocking `Content-Type: multipart/form-data` in a proxy.

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2025-05-15
Last Modified
2025-12-23

Frequently asked questions

What is CVE-2025-47287?

Tornado is a Python web framework and asynchronous networking library. When Tornado's ``multipart/form-data`` parser encounters certain errors, it logs a warning but continues trying to parse the remainder of the data. This allows remote attackers to generate an extremely high volume of logs, constituting a DoS attack. This DoS is compounded by the fact that the logging subsystem is synchronous. All versions of Tornado prior to 6.5.0 are affected. The vulnerable parser is enabled by default. Upgrade to Tornado version 6.50 to receive a patch. As a workaround, risk can be mitigated by blocking `Content-Type: multipart/form-data` in a proxy.

Is CVE-2025-47287 actively exploited?

Active exploitation of CVE-2025-47287 has not been confirmed. Its EPSS score was 0.7% on 2026-10-20, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2025-47287?

CVE-2025-47287 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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