CVE-2025-20304
📋 TL;DR
This vulnerability allows authenticated attackers with low privileges to conduct reflected cross-site scripting (XSS) attacks against Cisco ISE and ISE-PIC web management interfaces. Successful exploitation could enable attackers to execute arbitrary JavaScript in victims' browsers, potentially stealing session cookies or performing actions as the victim. Organizations using affected Cisco ISE versions are at risk.
💻 Affected Systems
- Cisco Identity Services Engine (ISE)
- Cisco ISE-PIC
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attacker steals administrator session cookies, gains full administrative access to Cisco ISE, and potentially compromises the entire network security infrastructure.
Likely Case
Attacker with low-privileged account steals session cookies of higher-privileged users, escalating privileges within the ISE system.
If Mitigated
Attack limited to stealing browser-based information from users who click malicious links, with minimal impact due to network segmentation and strong authentication controls.
🎯 Exploit Status
Exploitation requires authenticated access and social engineering to trick users into clicking malicious links.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Cisco advisory for specific patched versions
Vendor Advisory: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ise-multiple-vulns-O9BESWJH
Restart Required: Yes
Instructions:
1. Review Cisco advisory for affected versions. 2. Download and apply appropriate patch from Cisco. 3. Restart affected ISE services or nodes. 4. Verify patch installation.
🔧 Temporary Workarounds
Input Validation Enhancement
allImplement additional input validation on web interface inputs
Content Security Policy
allImplement strict Content Security Policy headers to mitigate XSS impact
🧯 If You Can't Patch
- Restrict access to ISE management interface to trusted networks only
- Implement strong authentication and session management controls
🔍 How to Verify
Check if Vulnerable:
Check Cisco ISE version against affected versions in Cisco advisoryCheck Version:
show version (in Cisco ISE CLI)Verify Fix Applied:
Verify installed version matches or exceeds patched version from Cisco advisory📡 Detection & Monitoring
Log Indicators:
- Unusual XSS payload patterns in web logs
- Multiple failed authentication attempts followed by successful login
Network Indicators:
- Suspicious HTTP requests containing script tags or JavaScript to ISE management interface
SIEM Query:
source="ISE_web_logs" AND (http_uri CONTAINS "<script>" OR http_uri CONTAINS "javascript:")