CVE-2022-20657
📋 TL;DR
This is a cross-site scripting (XSS) vulnerability in Cisco PI and EPNM web management interfaces that allows unauthenticated attackers to execute malicious scripts in users' browsers. Attackers can steal session cookies, redirect users, or perform actions as authenticated users by tricking them into clicking crafted links. Organizations using affected Cisco network management products are vulnerable.
💻 Affected Systems
- Cisco Prime Infrastructure
- Cisco Evolved Programmable Network Manager
📦 What is this software?
Evolved Programmable Network Manager by Cisco
View all CVEs affecting Evolved Programmable Network Manager →
Evolved Programmable Network Manager by Cisco
View all CVEs affecting Evolved Programmable Network Manager →
Evolved Programmable Network Manager by Cisco
View all CVEs affecting Evolved Programmable Network Manager →
Evolved Programmable Network Manager by Cisco
View all CVEs affecting Evolved Programmable Network Manager →
Evolved Programmable Network Manager by Cisco
View all CVEs affecting Evolved Programmable Network Manager →
Evolved Programmable Network Manager by Cisco
View all CVEs affecting Evolved Programmable Network Manager →
Evolved Programmable Network Manager by Cisco
View all CVEs affecting Evolved Programmable Network Manager →
Evolved Programmable Network Manager by Cisco
View all CVEs affecting Evolved Programmable Network Manager →
Evolved Programmable Network Manager by Cisco
View all CVEs affecting Evolved Programmable Network Manager →
Evolved Programmable Network Manager by Cisco
View all CVEs affecting Evolved Programmable Network Manager →
Evolved Programmable Network Manager by Cisco
View all CVEs affecting Evolved Programmable Network Manager →
Evolved Programmable Network Manager by Cisco
View all CVEs affecting Evolved Programmable Network Manager →
Evolved Programmable Network Manager by Cisco
View all CVEs affecting Evolved Programmable Network Manager →
Evolved Programmable Network Manager by Cisco
View all CVEs affecting Evolved Programmable Network Manager →
Evolved Programmable Network Manager by Cisco
View all CVEs affecting Evolved Programmable Network Manager →
Evolved Programmable Network Manager by Cisco
View all CVEs affecting Evolved Programmable Network Manager →
Evolved Programmable Network Manager by Cisco
View all CVEs affecting Evolved Programmable Network Manager →
Evolved Programmable Network Manager by Cisco
View all CVEs affecting Evolved Programmable Network Manager →
Evolved Programmable Network Manager by Cisco
View all CVEs affecting Evolved Programmable Network Manager →
Evolved Programmable Network Manager by Cisco
View all CVEs affecting Evolved Programmable Network Manager →
Evolved Programmable Network Manager by Cisco
View all CVEs affecting Evolved Programmable Network Manager →
Evolved Programmable Network Manager by Cisco
View all CVEs affecting Evolved Programmable Network Manager →
Evolved Programmable Network Manager by Cisco
View all CVEs affecting Evolved Programmable Network Manager →
Evolved Programmable Network Manager by Cisco
View all CVEs affecting Evolved Programmable Network Manager →
⚠️ Risk & Real-World Impact
Worst Case
Attacker gains administrative access to network management system, modifies configurations, disrupts network operations, or pivots to other systems.
Likely Case
Attacker steals session cookies to impersonate authenticated users, accesses sensitive network configuration data, or performs limited unauthorized actions.
If Mitigated
Attack fails due to input validation, CSP headers, or user awareness preventing malicious link clicks.
🎯 Exploit Status
Exploitation requires social engineering to trick users into clicking malicious links.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Refer to Cisco advisory for specific fixed versions
Vendor Advisory: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-pi-epnm-path-trav-zws324yn
Restart Required: Yes
Instructions:
1. Review Cisco advisory for affected versions. 2. Download and install appropriate fixed software version. 3. Restart affected services or appliances. 4. Verify patch installation.
🧯 If You Can't Patch
- Implement Content Security Policy (CSP) headers to restrict script execution
- Restrict network access to management interfaces using firewall rules
🔍 How to Verify
Check if Vulnerable:
Check Cisco Prime Infrastructure or EPNM version against advisory; versions prior to fixed releases are vulnerable.Check Version:
Check via web interface: Admin > System > Software Update or CLI: show versionVerify Fix Applied:
Verify installed version matches or exceeds fixed version listed in Cisco advisory.📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP requests with script payloads in query parameters
- Multiple failed login attempts followed by successful login from new IP
Network Indicators:
- HTTP requests containing suspicious script tags or JavaScript in URLs
- Outbound connections to unknown domains from management interface
SIEM Query:
web.url:*script* OR web.url:*javascript* AND (dest.ip:management_interface_ip)