// For flags

CVE-2024-52804

Tornado has HTTP cookie parsing DoS vulnerability

Severity Score

7.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Attend
*SSVC
Descriptions

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.

A flaw was found in Tornado's HTTP cookie parsing algorithm. This vulnerability allows excessive CPU consumption via maliciously crafted cookie headers due to Quadratic complexity, potentially blocking the processing of other requests and leading to the loss of availability of the system.

It was discovered that Tornado incorrectly handled a certain redirect. A remote attacker could possibly use this issue to redirect a user to an arbitrary web site and conduct a phishing attack by having the user access a specially crafted URL. This issue was only addressed in Ubuntu 22.04 LTS, Ubuntu 20.04 LTS, and Ubuntu 18.04 LTS. Ubuntu 16.04 LTS was previously addressed in USN-6159-1. It was discovered that Tornado inefficiently handled requests when parsing cookies. An attacker could possibly use this issue to increase resource utilization leading to a denial of service.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
None
Integrity
None
Availability
Complete
* Common Vulnerability Scoring System
SSVC
  • Decision:Attend
Exploitation
None
Automatable
Yes
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2024-11-15 CVE Reserved
  • 2024-11-22 CVE Published
  • 2024-11-25 CVE Updated
  • 2025-08-18 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-400: Uncontrolled Resource Consumption
  • CWE-770: Allocation of Resources Without Limits or Throttling
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Tornadoweb
Search vendor "Tornadoweb"
 Tornado
Search vendor "Tornadoweb" for product "Tornado"
 < 6.4.2
Search vendor "Tornadoweb" for product "Tornado" and version " < 6.4.2"
en
Affected