CVE-2021-39214— Lacking Protection against HTTP Request Smuggling in mitmproxy
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I. Basic Information for CVE-2021-39214
Vulnerability Information
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Vulnerability Title
Lacking Protection against HTTP Request Smuggling in mitmproxy
Source: NVD (National Vulnerability Database)
Vulnerability Description
mitmproxy is an interactive, SSL/TLS-capable intercepting proxy. In mitmproxy 7.0.2 and below, a malicious client or server is able to perform HTTP request smuggling attacks through mitmproxy. This means that a malicious client/server could smuggle a request/response through mitmproxy as part of another request/response's HTTP message body. While a smuggled request is still captured as part of another request's body, it does not appear in the request list and does not go through the usual mitmproxy event hooks, where users may have implemented custom access control checks or input sanitization. Unless one uses mitmproxy to protect an HTTP/1 service, no action is required. The vulnerability has been fixed in mitmproxy 7.0.3 and above.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
Source: NVD (National Vulnerability Database)
Vulnerability Title
mitmproxy环境问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
mitmproxy是一个交互式的、支持 SSL/TLS 的拦截代理，带有用于 HTTP/1、HTTP/2 和 WebSockets 的控制台界面。 mitmproxy 7.0.2及之前版本存在环境问题漏洞，恶意客户端/服务器可以通过mitmproxy将请求/响应作为另一个请求/响应的HTTP消息体的一部分走私。该漏洞已在mitmproxy 7.0.3及更高版本中修复。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2021-39214
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IV. Related Vulnerabilities
Same weakness: CWE-444
- CVE-2026-40562
Gazelle versions through 0.49 for Perl allows HTTP Request S - CVE-2026-40561
Starlet versions through 0.31 for Perl allows HTTP Request S - CVE-2026-39805
CL.CL HTTP request smuggling via duplicate Content-Length in - CVE-2026-40560
Starman versions before 0.4018 for Perl allows HTTP Request - CVE-2026-41873
Pony Mail: Admin account takeover via request smuggling
V. Comments for CVE-2021-39214
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