VMware NSX SD-WAN Edge (VeloCloud) Local Web UI Remote Command Injection and Code Execution (CVE-2018-6961)
Executive & SecOps Summary
SECOPS ASSESSMENTVMware NSX SD-WAN Edge by VeloCloud prior to version 3.1.0 with the local web UI component enabled.
Unauthenticated remote attackers can execute arbitrary system commands with root privileges, leading to complete compromise of the SD-WAN appliance.
Immediately upgrade to version 3.1.0 or higher, or disable the local web UI service and restrict access from untrusted networks.
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
Upgrade the NSX SD-WAN Edge appliance to version 3.1.0 or later via the VeloCloud Orchestrator (VCO) or manual firmware update.
# Verify the current software version running on the Edge appliance
show version
# Apply the upgrade profile to version 3.1.0 or higher via the Orchestrator UI/CLI
# Ensure the firmware image signature is verified before deployment2. Temporary Workaround & Hardening Configuration
If patching cannot be applied immediately, disable the local web UI service and restrict network access.
# Disable the local web UI service on the Edge appliance
configure
set device local-web-ui disable
commit
# Restrict access to TCP ports 80 and 443 from untrusted networks using firewall rules3. Log Audit & IoC Verification Commands
Audit the web server and system logs for suspicious command injection patterns and unauthorized shell executions.
# Search for common command injection patterns in the local web UI access logs
grep -E '(\||;|`|\$\()' /var/log/nginx/access.log
# Check for unexpected active shell processes or outbound connections
ps aux | grep -E '(sh|bash|python|perl|nc|curl|wget)'Stop Exposing VPN Ports to the Internet — Switch to Zero-Trust Access
Eliminate public-facing VPN concentrators and firewall management ports with identity-first Zero-Trust Network Access.
Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
This vulnerability (CVE-2018-6961) is an OS command injection vulnerability (CWE-78) located in the local web user interface (UI) component of VMware NSX SD-WAN Edge (VeloCloud). The root cause is the lack of proper input validation and sanitization of user-supplied parameters before passing them to system shell execution functions. Although this component is disabled by default, enabling it exposes the system to severe risks.
2. Exploitation Mechanics & Attack Scenario
An attacker with network access to the local web UI port (typically HTTP/HTTPS) can send specially crafted HTTP requests containing shell metacharacters (such as ';', '&&', or '`'). Because the application fails to sanitize these inputs, the injected commands are executed directly on the underlying operating system with administrative privileges. This allows full remote code execution (RCE) without requiring any authentication.
3. Infrastructure & Business Impact
Since SD-WAN Edge appliances act as critical gateways for enterprise networks, a compromise of this device allows attackers to intercept network traffic, manipulate VPN tunnels, and perform lateral movement into internal corporate networks. Given that this vulnerability is listed on the CISA KEV catalog, indicating active exploitation in the wild, failure to remediate poses an immediate threat to business continuity and data confidentiality.
Official Vendor Advisories & References
VMware NSX SD-WAN Edge by VeloCloud prior to version 3.1.0 contains a command injection vulnerability in the local web UI component. This component is disabled by default and should not be enabled on untrusted networks. VeloCloud by VMware will be removing this service from the product in future releases. Successful exploitation of this issue could result in remote code execution.
Frequently Asked SecOps Questions (CVE-2018-6961)
FAQQ1. How critical is CVE-2018-6961 and is it actively exploited in the wild?
CVE-2018-6961 is rated CVSS 8.1 (HIGH) with a 30-day EPSS exploitation probability of 85.3%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2018-6961?
Primary impacted vendors include vmware across nsx_sd-wan_edge. Scope summary: All VMware NSX SD-WAN Edge by VeloCloud versions prior to 3.1.0 (when local web UI is enabled)
Q3. What temporary mitigations or workarounds exist for CVE-2018-6961 before patching?
[Mitigation] Immediately upgrade to version 3.1.0 or higher, or disable the local web UI service and restrict access from untrusted networks. Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
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