CVE-2025-20303
📋 TL;DR
This CVE describes reflected cross-site scripting (XSS) vulnerabilities in Cisco ISE and ISE-PIC web management interfaces. An authenticated attacker with low privileges can inject malicious scripts that execute in victims' browsers when they visit manipulated pages. This affects organizations using vulnerable versions of Cisco Identity Services Engine and ISE-PIC.
💻 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 or credentials, gains full administrative access to ISE, and potentially compromises the entire identity and access management infrastructure.
Likely Case
Attacker with low-privileged account steals session data from other users, escalates privileges, and accesses sensitive information through the management interface.
If Mitigated
With proper input validation and output encoding, malicious scripts are neutralized, preventing execution and limiting impact to failed injection attempts.
🎯 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 patches from Cisco Software Center. 3. Restart ISE services as required. 4. Verify patch installation through version check.
🔧 Temporary Workarounds
Input Validation Enhancement
allImplement additional input validation for user-supplied data in web interface
Content Security Policy
allDeploy CSP headers to restrict script execution sources
🧯 If You Can't Patch
- Restrict network access to ISE management interface to trusted IPs only
- Implement web application firewall with XSS protection rules
🔍 How to Verify
Check if Vulnerable:
Check ISE version via CLI: show version, then compare with affected versions in Cisco advisoryCheck Version:
show versionVerify Fix Applied:
Verify installed version matches patched version from advisory and test XSS payloads are properly sanitized📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP requests with script tags or JavaScript in parameters
- Multiple failed login attempts followed by successful low-privilege login
Network Indicators:
- HTTP requests containing suspicious script patterns to ISE management interface
SIEM Query:
source="ISE" AND (http_uri CONTAINS "<script>" OR http_uri CONTAINS "javascript:")