#VU114414 Inconsistent interpretation of HTTP requests in mitmproxy - CVE-2025-57804
Published: August 25, 2025
Vulnerability identifier: #VU114414
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2025-57804
CWE-ID: CWE-444
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
mitmproxy
mitmproxy
Software vendor:
mitmproxy.org
mitmproxy.org
Description
The vulnerability allows a remote attacker to perform HTTP request smuggling attacks.
The vulnerability exists due to improper validation of HTTP/2 requests in the embed python-hyper/h2 component when mitmproxy is in a configuration where it translates HTTP/2 to HTTP/1. A remote attacker can send a specially crafted HTTP request to the server and smuggle arbitrary HTTP headers.
Successful exploitation of vulnerability may allow an attacker to poison HTTP cache and perform phishing attacks.
Remediation
Install updates from vendor's website.