CVE-2025-22245
📋 TL;DR
VMware NSX contains a stored Cross-Site Scripting vulnerability in the router port due to improper input validation. This allows authenticated attackers to inject malicious scripts that execute when other users view the affected interface. Organizations using vulnerable VMware NSX versions are affected.
💻 Affected Systems
- VMware NSX
📦 What is this software?
Vmware Nsx by Broadcom
Vmware Nsx by Broadcom
Vmware Nsx by Broadcom
⚠️ Risk & Real-World Impact
Worst Case
An authenticated attacker could inject malicious scripts that steal session cookies, redirect users to phishing sites, or perform actions on behalf of victims, potentially leading to full network compromise.
Likely Case
Attackers with valid credentials could inject scripts to steal session tokens or credentials from other authenticated users, enabling lateral movement within the NSX environment.
If Mitigated
With proper input validation and output encoding, the malicious scripts would be rendered harmless as text rather than executable code.
🎯 Exploit Status
XSS vulnerabilities typically have low exploitation complexity once the attack vector is identified. Requires authenticated access to the NSX interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Consult VMware security advisory for specific patched versions
Vendor Advisory: https://support.broadcom.com/web/ecx/support-content-notification/-/external/content/SecurityAdvisories/0/25738
Restart Required: Yes
Instructions:
1. Review VMware security advisory for affected versions. 2. Download and apply the appropriate patch from VMware. 3. Restart affected NSX services as required. 4. Verify the fix is applied successfully.
🔧 Temporary Workarounds
Input Validation Enhancement
allImplement additional input validation on the router port interface to sanitize user inputs
Content Security Policy
allImplement strict Content Security Policy headers to restrict script execution
🧯 If You Can't Patch
- Restrict access to NSX management interface to only trusted, necessary users
- Implement web application firewall rules to detect and block XSS payloads
🔍 How to Verify
Check if Vulnerable:
Check your VMware NSX version against the affected versions listed in the VMware security advisoryCheck Version:
Check NSX Manager web interface or use NSX CLI commands specific to your deploymentVerify Fix Applied:
After applying patches, verify the version has been updated and test the router port interface for XSS vulnerabilities📡 Detection & Monitoring
Log Indicators:
- Unusual script-like patterns in router port configuration logs
- Multiple failed input validation attempts
Network Indicators:
- Suspicious HTTP requests containing script tags or JavaScript to router port endpoints
SIEM Query:
source="nsx" AND ("script" OR "javascript" OR "onload" OR "onerror") AND dest_port="router_port"