CVE-2021-22014
📋 TL;DR
CVE-2021-22014 is an authenticated remote code execution vulnerability in VMware vCenter Server's VAMI interface. An attacker with valid credentials and network access to port 5480 can execute arbitrary code on the underlying vCenter Server operating system. This affects organizations running vulnerable vCenter Server versions.
💻 Affected Systems
- VMware vCenter Server
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full compromise of vCenter Server leading to complete control over virtual infrastructure, data exfiltration, lateral movement to connected systems, and potential ransomware deployment across virtual machines.
Likely Case
Privilege escalation leading to administrative control of vCenter Server, enabling manipulation of virtual machines, network configurations, and access to sensitive management data.
If Mitigated
Limited impact due to network segmentation, strong authentication controls, and minimal user access to VAMI interface.
🎯 Exploit Status
Exploitation requires valid VAMI credentials. Public proof-of-concept code exists, making this relatively easy to exploit for attackers with credentials.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: vCenter Server 6.5 U3n, 6.7 U3o, 7.0 U2c or later
Vendor Advisory: https://www.vmware.com/security/advisories/VMSA-2021-0020.html
Restart Required: Yes
Instructions:
1. Download appropriate patch from VMware portal. 2. Backup vCenter Server. 3. Apply patch using vCenter Server Update Planner or CLI. 4. Restart vCenter Server services as required.
🔧 Temporary Workarounds
Restrict VAMI Access
linuxBlock network access to VAMI interface (port 5480) except from trusted management networks
# Example firewall rule (Linux): iptables -A INPUT -p tcp --dport 5480 -s TRUSTED_NETWORK -j ACCEPT
# Example firewall rule (Linux): iptables -A INPUT -p tcp --dport 5480 -j DROP
Minimize VAMI Users
allReduce number of users with VAMI access and implement strong authentication controls
🧯 If You Can't Patch
- Implement strict network segmentation to isolate vCenter Server VAMI interface from untrusted networks
- Enforce multi-factor authentication and strong password policies for all VAMI users
🔍 How to Verify
Check if Vulnerable:
Check vCenter Server version and compare against patched versions. Verify if VAMI interface is accessible on port 5480.Check Version:
Connect to vCenter Server appliance shell and run: cat /etc/vmware-releaseVerify Fix Applied:
Confirm vCenter Server version is 6.5 U3n, 6.7 U3o, 7.0 U2c or later. Test VAMI functionality to ensure patch didn't break management features.📡 Detection & Monitoring
Log Indicators:
- Unusual authentication attempts to VAMI interface
- Suspicious process execution from VAMI service
- Unexpected network connections from vCenter Server
Network Indicators:
- Unusual traffic to/from vCenter Server port 5480
- Suspicious payloads in VAMI protocol traffic
SIEM Query:
source="vcenter" AND (port=5480 AND (failed_auth OR suspicious_process))