CVE-2026-79691 Overview
CVE-2026-79691 is an Improper Certificate Validation vulnerability [CWE-295] affecting Dell Secure Connect Gateway (SCG) 5.0. The flaw exists 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. An unauthenticated remote attacker can exploit the weakness to bypass protection mechanisms enforced through TLS certificate trust. Dell disclosed the issue in security advisory DSA-2026-382 and released fixed builds for both the appliance and application distributions.
Critical Impact
Unauthenticated network attackers can bypass certificate-based trust in Dell SCG 5.0, enabling potential man-in-the-middle interception of gateway communications.
Affected Products
- Dell Secure Connect Gateway (SCG) 5.0 Appliance versions prior to 5.36.00.16
- Dell Secure Connect Gateway (SCG) 5.0 Application versions prior to 5.36.00.00
- Dell Secure Connect Gateway Virtual Edition (per DSA-2026-382)
Discovery Timeline
- 2026-09-07 - CVE-2026-79691 published to NVD
- 2026-09-08 - Last updated in NVD database
Technical Details for CVE-2026-79691
Vulnerability Analysis
Dell Secure Connect Gateway is a communication broker that relays telemetry, service requests, and remote support sessions between customer infrastructure and Dell backend services. The vulnerability stems from improper validation of X.509 certificates during TLS session establishment. When certificate chain verification is incomplete, an attacker positioned on the network path can present a certificate that the gateway accepts as trusted. This defeats the authentication guarantee that TLS is expected to provide.
The issue is classified under [CWE-295: Improper Certificate Validation]. Because the flaw is reachable over the network with no authentication and no user interaction, exploitation requires only network adjacency to intercept or redirect SCG traffic. Successful exploitation results in a protection mechanism bypass with limited impact to confidentiality, integrity, and availability of gateway communications.
Root Cause
The root cause is insufficient verification of one or more certificate properties during the TLS handshake. Typical failure modes in this class include missing hostname verification, acceptance of self-signed or untrusted issuers, incomplete chain validation, or ignored revocation status. Any of these conditions allows a forged or attacker-controlled certificate to be treated as valid.
Attack Vector
An attacker on the network path between the SCG and a peer endpoint can intercept the TLS handshake and present a fraudulent certificate. Because the gateway does not reject the certificate correctly, the attacker establishes a trusted-looking channel and can inspect or modify data in transit. The vulnerability manifests during protocol negotiation rather than in application logic, so no credentials or prior access are required. Refer to the Dell Security Update DSA-2026-382 advisory for vendor-specific technical details.
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Stop Identity AttacksDetection Methods for CVE-2026-79691
Indicators of Compromise
- Unexpected TLS certificates presented to or by SCG hosts that do not chain to Dell's expected issuers.
- Outbound SCG connections resolving to IP addresses outside of Dell's published service ranges.
- TLS session renegotiations or handshake anomalies logged by network security devices adjacent to the gateway.
Detection Strategies
- Inspect network telemetry for TLS sessions terminating at SCG appliances and compare presented certificate fingerprints against a known-good baseline.
- Alert on SCG hosts running versions below 5.36.00.16 (Appliance) or 5.36.00.00 (Application) using authenticated vulnerability scans.
- Correlate SCG process activity with unusual outbound destinations in endpoint and network detection tooling.
Monitoring Recommendations
- Enable TLS inspection or JA3/JA4 fingerprinting on egress paths used by SCG to detect handshake anomalies.
- Forward SCG system and audit logs to a centralized SIEM for correlation with network flow data.
- Monitor DNS resolution for Dell service endpoints and alert on unexpected changes.
How to Mitigate CVE-2026-79691
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.
- Inventory all SCG deployments, including Virtual Edition instances, and confirm patched versions across the fleet.
- Restrict inbound and outbound network paths for SCG hosts to only the endpoints required for Dell support connectivity.
Patch Information
Dell released fixed builds in advisory DSA-2026-382. Administrators should apply the updated SCG 5.0 Appliance (5.36.00.16) or SCG 5.0 Application (5.36.00.00) package according to Dell's upgrade guidance. Full remediation details are documented in the Dell Security Update DSA-2026-382.
Workarounds
- No vendor-provided workaround is documented; patching is the required remediation.
- Where immediate patching is not feasible, isolate SCG hosts on a dedicated management VLAN and limit egress to Dell service endpoints only.
- Enforce strict network segmentation and monitor TLS traffic from SCG systems for certificate anomalies until updates are applied.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
