SB2023081230 - Inconsistent interpretation of HTTP requests in Tornado

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Main Vulnerability Database SB2023081230

SB2023081230 - Inconsistent interpretation of HTTP requests in Tornado

Published: August 12, 2023 Updated: April 27, 2026

Security Bulletin ID SB2023081230
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Inconsistent interpretation of HTTP requests (CVE-ID: N/A)

CWE-ID: CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to perform HTTP request smuggling.

The vulnerability exists due to inconsistent interpretation of HTTP requests in tornado/http1connection.py when parsing Content-Length fields and chunk lengths containing non-standard characters. A remote attacker can send a specially crafted request to perform HTTP request smuggling.

Exploitation requires Tornado to be deployed behind certain proxies that interpret those non-standard characters differently.


Remediation

Install update from vendor's website.

References