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CVE

CVE-2024-52804

Tornado is a Python web framework and asynchronous networking library. The algorithm used for parsing HTTP cookies in To

Tornado is a Python web framework and asynchronous networking library. The algorithm used for parsing HTTP cookies in Tornado versions prior to 6.4.2 sometimes has quadratic complexity, leading to excessive CPU consumption when parsing maliciously-crafted cookie headers. This parsing occurs in the event loop thread and may block the processing of other requests.

Version 6.4.2 fixes the issue.

HIGH · CVSS 7.5 EPSS 0.00148
Schedule remediation
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-400Uncontrolled Resource Consumption
CWE-770Allocation of Resources Without Limits or Throttling
▤

Affected Products & Versions

1
tornadoweb tornado< 6.4.2
▤

Affected Packages

1
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
PyPI tornado HIGH fixed in 6.4.2
▣

Scoring & Timeline

7.5
HIGH · CVSS v3.1 · security-advisories@github.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD22 Nov 2024 · 04:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
yes
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

16
suse-csafSUSE-SU-2025:20445-1
suse-csafSUSE-SU-2025:20096-1
usnUSN-7150-1
suse-csafSUSE-SU-2024:4137-1
suse-csafopenSUSE-SU-2024:14528-1
🔗

References & Sources

4
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/advisories/GHSA-7pwv-g7hj-39prNot Applicable
https://github.com/tornadoweb/tornado/commit/d5ba4a1695fbf7c6a3e54313262639b198291533Patch
https://github.com/tornadoweb/tornado/security/advisories/GHSA-8w49-h785-mj3cThird Party Advisory
https://lists.debian.org/debian-lts-announce/2025/01/msg00000.html
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