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
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Inconsistent interpretation of HTTP requests (CVE-ID: N/A)
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.