CVE-2025-20355
📋 TL;DR
An open redirect vulnerability in Cisco Catalyst Center Virtual Appliance's web management interface allows unauthenticated remote attackers to redirect users to malicious websites. This occurs due to improper validation of HTTP request parameters. Organizations using affected versions of Cisco Catalyst Center Virtual Appliance are at risk.
💻 Affected Systems
- Cisco Catalyst Center Virtual Appliance
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Users could be redirected to phishing sites that steal credentials or deliver malware, potentially leading to full network compromise.
Likely Case
Attackers redirect users to phishing pages to harvest credentials or deliver malware through drive-by downloads.
If Mitigated
With proper network segmentation and user awareness, impact is limited to potential credential theft from targeted users.
🎯 Exploit Status
Exploitation requires intercepting and modifying HTTP requests, which can be done via man-in-the-middle attacks or social engineering.
🛠️ 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-catc-open-redirect-3W5Bk3Je
Restart Required: Yes
Instructions:
1. Review Cisco advisory for fixed versions. 2. Backup configuration. 3. Download and install the patched version from Cisco. 4. Restart the appliance. 5. Verify the update was successful.
🔧 Temporary Workarounds
Restrict Management Interface Access
allLimit access to the web management interface to trusted IP addresses only
Use HTTPS Only
allEnforce HTTPS and disable HTTP access to prevent interception
🧯 If You Can't Patch
- Implement strict network segmentation to isolate the management interface
- Deploy web application firewall rules to block open redirect patterns
🔍 How to Verify
Check if Vulnerable:
Check current version against affected versions listed in Cisco advisoryCheck Version:
Check via Catalyst Center web interface or CLI: show versionVerify Fix Applied:
Verify installed version matches or exceeds the fixed version in Cisco advisory📡 Detection & Monitoring
Log Indicators:
- HTTP requests with suspicious redirect parameters
- Unusual outbound connections from management interface
Network Indicators:
- HTTP 302 redirects to external domains from management interface
- Suspicious parameter values in HTTP requests
SIEM Query:
source="catalyst-center" AND (url="*redirect=*" OR status=302) AND dest_ip NOT IN [trusted_networks]