CVE-2026-79970: Dell Secure Connect Gateway Auth Bypass

CVE-2026-79970 is an authentication bypass flaw in Dell Secure Connect Gateway caused by improper cryptographic signature verification. Unauthenticated attackers can exploit this remotely to bypass security mechanisms. This article covers technical details, affected versions, potential impact, and mitigation strategies.

CVE-2026-79970 Overview

CVE-2026-79970 affects Dell Secure Connect Gateway (SCG) 5.0, both the Appliance and Application editions. The vulnerability stems from Improper Verification of Cryptographic Signature [CWE-347]. An unauthenticated remote attacker can exploit the flaw to bypass a protection mechanism within the product. Dell addressed the issue in Appliance version 5.36.00.16 and Application version 5.36.00.00 through security advisory DSA-2026-382.

Critical Impact
Unauthenticated remote attackers can bypass cryptographic signature verification, undermining a security control that Dell SCG relies on to validate trusted content.

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-2026-79970 published to NVD
2026-09-09 - Last updated in NVD database

Technical Details for CVE-2026-79970

Vulnerability Analysis

Dell Secure Connect Gateway brokers secure connectivity between customer infrastructure and Dell support services. The affected releases fail to properly verify a cryptographic signature before trusting associated data or code. The weakness maps to [CWE-347], Improper Verification of Cryptographic Signature. Because signature checks gate a protection mechanism, a successful bypass allows an attacker to influence functionality that should be restricted to trusted, signed content. Exploitation requires network access to the SCG endpoint but does not require authentication or user interaction. Attack complexity is high, indicating that specific conditions must be met for the bypass to succeed.

Root Cause

The root cause is incomplete or incorrect validation of a cryptographic signature within SCG's trust-verification path. When signature verification does not enforce the expected checks, an attacker can present crafted input that the application treats as authentic, defeating the protection the signature was intended to enforce.

Attack Vector

The attack vector is network-based against an exposed Dell SCG instance. An unauthenticated attacker with remote reachability to the appliance or application can craft input that traverses the flawed verification routine. A successful exploit yields limited confidentiality, integrity, and availability impact on the appliance, consistent with a protection-mechanism bypass rather than direct code execution.

No verified proof-of-concept code is available for CVE-2026-79970. Refer to the Dell Security Update DSA-2026-382 for vendor-provided technical details.

Detection Methods for CVE-2026-79970

Indicators of Compromise

Unexpected configuration changes, package installations, or update events on Dell SCG appliances that lack a corresponding administrator action.
Inbound network connections to SCG management interfaces from unknown or untrusted sources.
Log entries indicating signature verification warnings, retries, or non-standard content being accepted by SCG components.

Detection Strategies

Inventory all Dell SCG 5.0 Appliance and Application instances and compare installed versions against 5.36.00.16 and 5.36.00.00 respectively.
Alert on any SCG process spawning unexpected child processes, writing to system directories, or modifying trust stores.
Correlate SCG audit logs with network telemetry to identify unauthenticated sessions preceding configuration or trust-related events.

Monitoring Recommendations

Forward SCG appliance logs to a centralized SIEM and retain them for signature-verification and update events.
Monitor egress from SCG hosts to detect anomalous callbacks that could indicate bypass abuse.
Track vendor advisories from Dell for updated indicators or supplemental fixes tied to DSA-2026-382.

How to Mitigate CVE-2026-79970

Immediate Actions Required

Upgrade Dell SCG 5.0 Appliance to version 5.36.00.16 or later.
Upgrade Dell SCG 5.0 Application to version 5.36.00.00 or later.
Restrict network reachability of SCG management interfaces to trusted administrative networks only.
Review SCG audit logs for anomalous activity dating back to before the patch was applied.

Patch Information

Dell released fixed builds through security advisory Dell Security Update DSA-2026-382. Apply the corresponding Appliance or Application update on every SCG instance and validate the version after upgrade.

Workarounds

Place SCG behind network segmentation and firewall rules that only permit traffic from authorized administrators and Dell endpoints.
Disable or isolate SCG instances that cannot be immediately patched until the fixed version is deployed.
Enforce strict change-control on SCG hosts so unauthorized modifications are detected quickly.

bash

# Verify installed Dell SCG version on the appliance
cat /etc/scg/version

# Example firewall restriction limiting SCG management access to a trusted subnet
iptables -A INPUT -p tcp --dport 443 -s 10.10.20.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP