CVE-2025-20317
📋 TL;DR
An unauthenticated remote attacker can exploit insufficient endpoint verification in Cisco IMC's vKVM connection handling to redirect users to malicious websites via crafted links. This affects Cisco Integrated Management Controller and Cisco UCS Manager systems with vulnerable vKVM clients. Successful exploitation could lead to credential theft.
💻 Affected Systems
- Cisco Integrated Management Controller (IMC)
- Cisco UCS Manager
⚠️ 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
Attackers capture administrative credentials, gain full control of affected systems, and pivot to compromise entire infrastructure.
Likely Case
Users are redirected to phishing sites where credentials are harvested, leading to unauthorized access to management interfaces.
If Mitigated
With proper network segmentation and user awareness, impact is limited to isolated management network incidents.
🎯 Exploit Status
Requires user interaction (clicking crafted link) but no authentication needed
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Cisco advisory for specific fixed versions
Vendor Advisory: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ucs-vkvmorv-CnKrV7HK
Restart Required: Yes
Instructions:
1. Review Cisco advisory for affected versions 2. Download and apply appropriate firmware update 3. Restart affected systems 4. Verify update applied successfully
🔧 Temporary Workarounds
Restrict vKVM Access
allLimit vKVM client access to trusted networks only
Configure firewall rules to restrict vKVM port access to management VLAN only
User Awareness Training
allTrain users not to click unsolicited vKVM links
🧯 If You Can't Patch
- Isolate affected systems on separate management network with strict access controls
- Disable vKVM functionality if not required for operations
🔍 How to Verify
Check if Vulnerable:
Check Cisco IMC/UCS Manager firmware version against advisoryCheck Version:
show version (Cisco CLI) or check web interface firmware infoVerify Fix Applied:
Verify firmware version matches patched version from advisory📡 Detection & Monitoring
Log Indicators:
- Unusual vKVM connection attempts
- Multiple failed authentication attempts following vKVM access
Network Indicators:
- Unexpected outbound connections from management interfaces
- Traffic to known malicious domains
SIEM Query:
source="cimc_logs" OR source="ucs_logs" AND (event="vKVM" OR port=2068) AND dest_ip NOT IN trusted_nets