CVE-2026-79641: Dell Secure Connect Gateway RCE Vulnerability

CVE-2026-79641 Overview

CVE-2026-79641 is an OS Command Injection vulnerability [CWE-78] affecting Dell Secure Connect Gateway (SCG) 5.0. The flaw resides in Dell SCG 5.0 Appliance versions prior to 5.36.00.16 and Dell SCG 5.0 Application versions prior to 5.36.00.00. A remote attacker with low privileges can inject operating system commands through improperly neutralized special elements. Successful exploitation leads to elevation of privileges on the affected appliance. Dell published advisory DSA-2026-382 to address this issue alongside other vulnerabilities in the same product line.

Critical Impact

Authenticated remote attackers can escalate privileges on Dell Secure Connect Gateway by injecting arbitrary OS commands, compromising confidentiality, integrity, and availability of the appliance.

Affected Products

• Dell Secure Connect Gateway 5.0 Appliance (Virtual Edition) versions prior to 5.36.00.16
• Dell Secure Connect Gateway 5.0 Application versions prior to 5.36.00.00
• Deployments using CPE cpe:2.3:a:dell:secure_connect_gateway (application and virtual)

Discovery Timeline

• 2026-09-09 - CVE-2026-79641 published to the National Vulnerability Database
• 2026-09-09 - Last updated in NVD database
• 2026-09-09 - Dell publishes security advisory DSA-2026-382

Technical Details for CVE-2026-79641

Vulnerability Analysis

Dell Secure Connect Gateway is a support and telemetry appliance that establishes a secure channel between Dell infrastructure and Dell's back-end support systems. The vulnerability is classified as Improper Neutralization of Special Elements used in an OS Command [CWE-78]. An authenticated user with low privileges can supply crafted input that reaches an underlying shell invocation without adequate sanitization. Because SCG runs privileged system operations to manage device connectivity and diagnostics, injected commands execute in a higher-privileged context than the attacker's own account. This produces a vertical privilege escalation on the appliance.

Root Cause

The root cause is unsafe construction of OS command strings using attacker-controllable input. Special shell metacharacters such as ;, |, &, backticks, and $() are not neutralized before the command is passed to a system shell interpreter. This pattern typically occurs when application code concatenates user input into calls like Runtime.exec, os.system, or shell pipelines rather than using parameterized process invocation with argument arrays.

Attack Vector

The attack is remote and requires an authenticated session with low privileges on the SCG management interface. The attack complexity is high, indicating that specific preconditions or timing may be required for reliable exploitation. Once these conditions are met, the attacker submits input containing shell metacharacters through a vulnerable parameter. The injected commands run with the privileges of the SCG service process, enabling privilege escalation, data disclosure, tampering, or disruption of the gateway.

No public proof-of-concept exploit is currently listed for this CVE. Refer to the Dell advisory for authoritative technical details.

Detection Methods for CVE-2026-79641

Indicators of Compromise

• Unexpected child processes spawned by SCG service accounts, particularly shells such as /bin/sh, /bin/bash, or utilities like curl, wget, nc, and python.
• Outbound network connections from the SCG appliance to non-Dell infrastructure, including unexpected DNS lookups or command-and-control beacons.
• New or modified cron jobs, systemd units, or SSH authorized_keys entries on the appliance file system.
• Authentication events from low-privileged SCG accounts followed by administrative configuration changes.

Detection Strategies

• Inspect SCG application and access logs for parameters containing shell metacharacters (;, |, &&, `, $() submitted by non-administrative accounts.
• Correlate authenticated HTTPS requests to the SCG management interface with process-creation telemetry on the appliance host.
• Alert on any process launched by the SCG service that is not part of its documented runtime baseline.

Monitoring Recommendations

• Forward SCG audit logs, syslog, and process telemetry to a centralized SIEM or data lake for cross-source correlation.
• Baseline normal SCG outbound destinations and alert on deviations, especially direct-to-internet traffic outside Dell support endpoints.
• Monitor for privilege changes, new local accounts, and modifications to service configuration files on the appliance.

How to Mitigate CVE-2026-79641

Immediate Actions Required

• Upgrade Dell SCG 5.0 Appliance to version 5.36.00.16 or later, and Dell SCG 5.0 Application to version 5.36.00.00 or later, as directed in DSA-2026-382.
• Inventory all SCG deployments, including virtual editions, and confirm patch level against the fixed versions.
• Rotate credentials for any low-privileged SCG accounts that may have been exposed or reused elsewhere.
• Review authentication and audit logs for suspicious activity prior to patch deployment.

Patch Information

Dell has released fixed versions in security advisory DSA-2026-382. Administrators should apply Appliance build 5.36.00.16 or Application build 5.36.00.00, or later, and validate the upgrade in a test environment before rolling out to production gateways. Follow Dell's documented upgrade procedure to preserve appliance configuration and telemetry continuity.

Workarounds

• Restrict network access to the SCG management interface using firewall rules or network segmentation, limiting reachability to trusted administrative subnets.
• Enforce the principle of least privilege by removing unnecessary low-privileged accounts and disabling unused authentication paths on the appliance.
• Enable multi-factor authentication for all SCG user accounts where supported to reduce the risk of credential-based access.

# Configuration example: restrict SCG management access to a trusted admin subnet
# Replace <SCG_IP> and <ADMIN_SUBNET> with values from your environment
iptables -A INPUT -p tcp -d <SCG_IP> --dport 443 -s <ADMIN_SUBNET> -j ACCEPT
iptables -A INPUT -p tcp -d <SCG_IP> --dport 443 -j DROP