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CVE-2025-23217— Mitmweb API Authentication Bypass Using Proxy Server

Quick assessment

Affected
mitmproxy mitmproxy
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

mitmproxy是mitmproxy开源的一个交互式的、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 11.1.1及之前版本存在安全漏洞，该漏洞源于恶意客户端可以利用代理服务器访问其内部API，可能导致远程代码执行。

AI Predicted 8.5 Difficulty: Moderate EPSS 0.83% · P55

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-23217

Vulnerability Information
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Vulnerability Title
Mitmweb API Authentication Bypass Using Proxy Server
Source: CVE Program / CVE List V5
Vulnerability Description
mitmproxy is a interactive TLS-capable intercepting HTTP proxy for penetration testers and software developers and mitmweb is a web-based interface for mitmproxy. In mitmweb 11.1.1 and below, a malicious client can use mitmweb's proxy server (bound to `*:8080` by default) to access mitmweb's internal API (bound to `127.0.0.1:8081` by default). In other words, while the cannot access the API directly, they can access the API through the proxy. An attacker may be able to escalate this SSRF-style access to remote code execution. The mitmproxy and mitmdump tools are unaffected. Only mitmweb is affected. This vulnerability has been fixed in mitmproxy 11.1.2 and above. Users are advised to upgrade. There are no known workarounds for this vulnerability.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用候选路径或通道进行的认证绕过
Source: CVE Program / CVE List V5
Vulnerability Title
mitmproxy 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
mitmproxy是mitmproxy开源的一个交互式的、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 11.1.1及之前版本存在安全漏洞，该漏洞源于恶意客户端可以利用代理服务器访问其内部API，可能导致远程代码执行。
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

Vendor Product Affected Versions CPE Subscribe
mitmproxy mitmproxy < 11.1.2 -

II. Public POCs for CVE-2025-23217

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III. Intelligence Information for CVE-2025-23217

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Vendor Advisories for CVE-2025-23217 (1)

News Coverage for CVE-2025-23217 (1)

Other References for CVE-2025-23217 (1)

IV. Related Vulnerabilities

Same product: mitmproxy
Same vendor: mitmproxy
Same weakness: CWE-288

V. Comments for CVE-2025-23217

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