CVE-2025-67485 in mad-proxy
Summary
by MITRE • 12/10/2025
mad-proxy is a Python-based HTTP/HTTPS proxy server for detection and blocking of malicious web activity using custom security policies. Versions 0.3 and below allow attackers to bypass HTTP/HTTPS traffic interception rules, potentially exposing sensitive traffic. This issue does not have a fix at the time of publication.
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Analysis
by VulDB Data Team • 12/11/2025
CVE-2025-67485 represents a critical security vulnerability within mad-proxy version 0.3 and earlier, which operates as a Python-based HTTP/HTTPS proxy server designed for detecting and blocking malicious web activity through custom security policies. The flaw enables attackers to circumvent the intended interception rules that should protect against harmful traffic, creating a significant bypass opportunity that undermines the proxy's core security functionality. This vulnerability falls under the category of security misconfiguration and policy enforcement failure, as defined by CWE-693, where the system fails to properly enforce its intended security controls. The issue directly impacts the proxy's ability to maintain traffic integrity and can be categorized under ATT&CK technique T1071.004 for application layer protocol usage, specifically targeting web protocols that are meant to be monitored and controlled.
The technical implementation of this vulnerability stems from insufficient validation of HTTP/HTTPS traffic interception rules within the mad-proxy software architecture. Attackers can exploit this weakness by crafting malicious requests or manipulating proxy configuration parameters that allow traffic to bypass the defined security policies. The root cause likely involves inadequate input sanitization or improper rule evaluation mechanisms that fail to properly authenticate or validate traffic against the established security controls. This type of vulnerability is particularly dangerous because it operates at the network interception layer, where all traffic should be monitored and filtered according to security policies. The absence of a fix at publication time indicates that the software maintainers have not yet addressed this critical flaw, leaving deployments vulnerable to exploitation.
The operational impact of CVE-2025-67485 extends beyond simple traffic bypassing, as it fundamentally compromises the security posture of any organization relying on mad-proxy for web traffic monitoring and protection. Sensitive data that should be filtered or blocked according to security policies may flow through the proxy unimpeded, potentially exposing confidential information to malicious actors. This vulnerability could enable attackers to access restricted resources, exfiltrate data, or perform man-in-the-middle attacks against users who trust the proxy for security protection. Organizations using this software may experience regulatory compliance issues if sensitive traffic bypasses security controls, particularly in environments governed by standards such as pci dss, hipaa, or gdpr. The vulnerability also represents a significant risk for organizations that depend on the proxy for threat detection, as malicious traffic can evade monitoring systems that should be actively blocking harmful requests.
Organizations currently utilizing mad-proxy versions 0.3 or earlier should immediately implement mitigations to reduce the risk of exploitation. The primary mitigation strategy involves disabling or removing the affected proxy software until a patched version becomes available, as no official fix currently exists for this vulnerability. Network administrators should also consider implementing additional monitoring controls and intrusion detection systems to detect potential exploitation attempts, particularly focusing on unusual traffic patterns or attempts to bypass security policies. Organizations should conduct thorough security assessments to identify any traffic that may have been compromised due to this vulnerability, and consider implementing alternative proxy solutions with proper security controls. The lack of a fix at publication time underscores the importance of maintaining awareness of security vulnerabilities in open source software and implementing proactive security measures to protect against known weaknesses that may be exploited by adversaries.