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CVE-2025-23217

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Date: February 6, 2025

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.

Severity Score

Severity Score

Weakness Type (CWE)

Unintended Proxy or Intermediary ('Confused Deputy')

CWE-441

Authentication Bypass Using an Alternate Path or Channel

CWE-288

Top Fix

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Upgrade Version

Upgrade to version mitmproxy - 11.1.2

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): NONE
Availability (A): NONE

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