CVE-2026-79689: Dell Secure Connect Gateway RCE Vulnerability

CVE-2026-79689 Overview

CVE-2026-79689 is an OS Command Injection vulnerability in Dell Secure Connect Gateway (SCG) 5.0. The flaw affects SCG 5.0 Appliance versions prior to 5.36.00.16 and SCG 5.0 Application versions prior to 5.36.00.00. An unauthenticated remote attacker can inject operating system commands through improper neutralization of special elements [CWE-78]. Successful exploitation leads to script injection on the appliance, with potential compromise of confidentiality, integrity, and availability of the gateway.

Critical Impact

An unauthenticated network attacker can inject arbitrary OS commands into the Dell Secure Connect Gateway, gaining a foothold in the appliance that brokers support connectivity to Dell infrastructure.

Affected Products

• Dell Secure Connect Gateway 5.0 Appliance (versions prior to 5.36.00.16)
• Dell Secure Connect Gateway 5.0 Application (versions prior to 5.36.00.00)
• Dell SCG Virtual Edition deployments referenced in DSA-2026-382

Discovery Timeline

• 2026-09-09 - CVE-2026-79689 published to the National Vulnerability Database
• 2026-09-09 - Dell publishes advisory DSA-2026-382
• 2026-09-09 - Last updated in NVD database

Technical Details for CVE-2026-79689

Vulnerability Analysis

Dell Secure Connect Gateway is an appliance that brokers secure telemetry, remote support, and update traffic between Dell customer environments and Dell backend systems. The vulnerability resides in a component that passes user-controlled input into an operating system command without sufficient neutralization of shell metacharacters. Because the attack vector is network-based and requires no authentication or user interaction, any actor with network reachability to the SCG management interface can trigger command execution.

The outcome documented by Dell is script injection, indicating that attacker-supplied content is executed by the underlying shell or interpreter context of the gateway process. Given the appliance's privileged position in customer networks, code execution on SCG can be leveraged to pivot into adjacent management planes.

Root Cause

The root cause is improper neutralization of special elements used in an OS command, classified as [CWE-78]. Input reaching a command construction path is concatenated into a shell-invoked string rather than passed through a parameterized execution interface. Shell metacharacters such as ;, |, &, backticks, and $() are not filtered or escaped before invocation.

Attack Vector

Exploitation occurs over the network against exposed SCG management or API endpoints. The attacker submits a crafted request containing embedded shell syntax within a parameter that the appliance forwards to a system command. No credentials, tokens, or prior session state are required. Verified proof-of-concept code has not been published, and Dell has not reported observed exploitation in the wild. See Dell Security Update DSA-2026-382 for vendor-authored technical detail.

Detection Methods for CVE-2026-79689

Indicators of Compromise

• Unexpected child processes spawned by SCG service accounts, particularly shells (sh, bash) or interpreters (python, perl) originating from web-facing SCG components.
• HTTP request logs containing shell metacharacters (;, |, &&, `, $() in query strings or POST bodies directed at SCG management endpoints.
• Outbound connections from the SCG appliance to hosts outside of Dell's documented telemetry destinations.
• New or modified files under SCG working directories, including cron entries, systemd units, or SSH authorized_keys additions.

Detection Strategies

• Baseline the SCG process tree, then alert on any deviation where the SCG web or API process forks a shell or interpreter.
• Inspect reverse proxy and web access logs in front of SCG for URL-encoded shell metacharacters targeting API paths.
• Compare running SCG versions against the fixed builds 5.36.00.16 (Appliance) and 5.36.00.00 (Application) during vulnerability scans.

Monitoring Recommendations

• Forward SCG appliance logs, authentication events, and network flow data to a centralized analytics platform for retention and correlation.
• Monitor east-west traffic from SCG to internal management assets such as vCenter, iDRAC, and Active Directory for anomalous access patterns.
• Enable file integrity monitoring on SCG binaries, configuration directories, and scheduled task locations.

How to Mitigate CVE-2026-79689

Immediate Actions Required

• Upgrade Dell SCG 5.0 Appliance to version 5.36.00.16 or later and SCG 5.0 Application to version 5.36.00.00 or later, per DSA-2026-382.
• Restrict network access to SCG management interfaces to a dedicated administrative subnet using firewall or security group rules.
• Review SCG audit logs and process history for signs of prior command injection attempts since the last patch cycle.
• Rotate credentials, API keys, and certificates stored on or accessible from the SCG appliance if compromise is suspected.

Patch Information

Dell has released fixed builds for both deployment models. Administrators should apply Appliance version 5.36.00.16 or later, and Application version 5.36.00.00 or later. Refer to the Dell Security Update DSA-2026-382 for download locations, upgrade procedures, and companion CVEs remediated in the same release.

Workarounds

• Place SCG behind a network segmentation boundary that only permits inbound traffic from authorized administrator jump hosts.
• Disable or block external access to SCG management endpoints until the patch is applied.
• Deploy a web application firewall rule in front of SCG that denies requests containing shell metacharacters in parameters consumed by management APIs.

# Configuration example: restrict SCG management access with iptables
iptables -A INPUT -p tcp --dport 443 -s 10.10.20.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP