HTTP request smuggling in Apache Tomcat

Published: 2022-10-31
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2022-42252
Exploitation vector Network
Public exploit N/A
Vulnerable software
Apache Tomcat
Server applications / Web servers

Vendor Apache Foundation

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Inconsistent interpretation of HTTP requests

EUVDB-ID: #VU68859

Risk: Medium


CVE-ID: CVE-2022-42252

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

Exploit availability: No


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

The vulnerability exists due to improper validation of HTTP requests. A remote attacker can send a specially crafted HTTP request to the server and smuggle arbitrary HTTP headers via an invalid Content-Length header.

Successful exploitation of vulnerability may allow an attacker to poison HTTP cache and perform phishing attacks but requires Tomcat to be configured to ignore invalid HTTP headers via setting rejectIllegalHeader to false (not the default configuration).


Install updates from vendor's website.

Vulnerable software versions

Apache Tomcat: 10.0.0 - 10.0.26, 10.1.0 - 10.1.0-M20, 9.0.0 - 9.0.67, 8.5.0 - 8.5.82

CPE2.3 External links

Q & A

Can this vulnerability be exploited remotely?

How the attacker can exploit this vulnerability?

Is there known malware, which exploits this vulnerability?