CVE-2025-41750
📋 TL;DR
An unauthenticated cross-site scripting (XSS) vulnerability in pxc_PortCfg.php allows attackers to trick authenticated users into clicking malicious links, enabling unauthorized changes to device configuration parameters via the web-based management interface. This affects systems running vulnerable versions of the software with web management exposed. The vulnerability does not allow system-level access or session hijacking due to httpOnly cookie protection.
💻 Affected Systems
- Unknown specific product - referenced as affected software with pxc_PortCfg.php
📦 What is this software?
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⚠️ Risk & Real-World Impact
Worst Case
Attackers could modify critical device configuration parameters, potentially disrupting network operations or enabling further attacks by changing security settings.
Likely Case
Attackers modify non-critical configuration settings, causing operational disruptions or enabling data interception through parameter changes.
If Mitigated
With proper input validation and output encoding, the attack would fail to execute malicious scripts, preventing unauthorized configuration changes.
🎯 Exploit Status
Exploitation requires social engineering to trick authenticated users into clicking malicious links. No authentication bypass needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://certvde.com/de/advisories/VDE-2025-071
Restart Required: No
Instructions:
1. Monitor vendor advisory for patch availability. 2. Apply vendor-provided security updates when released. 3. Verify fix by testing XSS payloads against patched version.
🔧 Temporary Workarounds
Input Validation and Output Encoding
allImplement proper input validation and output encoding in pxc_PortCfg.php to prevent XSS payload execution.
Web Application Firewall (WAF)
allDeploy WAF with XSS protection rules to block malicious requests.
🧯 If You Can't Patch
- Restrict access to web management interface using network segmentation and firewall rules
- Implement Content Security Policy (CSP) headers to mitigate XSS impact
🔍 How to Verify
Check if Vulnerable:
Test pxc_PortCfg.php with XSS payloads like <script>alert('XSS')</script> in parameters and check if script executes.Check Version:
Unknown - check software documentation for version identificationVerify Fix Applied:
Retest with XSS payloads after applying fixes; scripts should not execute and input should be properly sanitized.📡 Detection & Monitoring
Log Indicators:
- Unusual parameter values in pxc_PortCfg.php requests
- Script tags or JavaScript in URL parameters
Network Indicators:
- HTTP requests to pxc_PortCfg.php with suspicious parameters
- Multiple failed attempts with XSS payloads
SIEM Query:
source="web_logs" AND uri="*pxc_PortCfg.php*" AND (param="*<script>*" OR param="*javascript:*")