CVE-2026-79943 in Secure Connect Gateway
Summary
by MITRE • 09/07/2026
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, contains an Improper Validation of Certificate with Host Mismatch vulnerability. An unauthenticated attacker with remote access could potentially exploit this vulnerability, leading to protection mechanism bypass.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 09/07/2026
The identified vulnerability in Dell SCG appliances and applications prior to versions 5.36.00.16 and 5.36.00.00 represents a critical failure in the implementation of Transport Layer Security protocols during certificate validation processes. Specifically, the system exhibits an improper validation mechanism when verifying server certificates against the hostname or identity of the remote endpoint. This flaw allows for a scenario where the cryptographic handshake completes successfully even if the presented digital certificate does not match the expected host identifier. In standard secure communications, such as those governed by TLS standards, strict verification ensures that clients are communicating with the intended entity and not an imposter. The absence of this rigorous check undermines the fundamental trust model established by Public Key Infrastructure, effectively rendering encryption useless against certain classes of network-based attacks because the identity of the peer remains unverified despite the presence of a valid signature chain.
From a technical perspective, this defect aligns with CWE-295, which describes Improper Certificate Validation, and more specifically relates to issues where hostname verification is either skipped or implemented incorrectly. When an attacker intercepts traffic between the SCG appliance and its management interface or connected storage systems, they can present a self-signed certificate or one issued by a different authority that matches any arbitrary domain name but lacks the correct subject alternative names for the actual target host. Because the application fails to perform a strict string comparison or wildcard matching against the configured hostname, it accepts this fraudulent credential as legitimate. This behavior is particularly dangerous in enterprise storage environments where sensitive data management and configuration changes are performed over these connections, creating a direct pathway for unauthorized access without requiring valid user credentials at the authentication layer.
The operational impact of this vulnerability is severe due to its potential for enabling man-in-the-middle attacks against unauthenticated remote users who possess network-level access to the appliance. An adversary positioned within the same broadcast domain or capable of routing traffic through the target can exploit this flaw to decrypt, modify, or inject malicious commands into the communication stream between the SCG and other systems. This bypasses protection mechanisms designed to secure administrative interfaces and data replication channels. Consequently, attackers could potentially exfiltrate sensitive storage configuration details, alter volume mappings, disrupt service availability by injecting false status reports, or escalate privileges by manipulating management traffic that relies on this trust relationship for authorization decisions. The lack of authentication requirement further amplifies the risk, as any remote actor with network reachability can initiate such an attack vector without prior credential compromise.
Mitigation strategies must prioritize immediate patching to address the root cause within the software stack. Administrators should upgrade Dell SCG appliances to version 5.36.00.16 or later and ensure that associated applications are updated to version 5.36.00.00 or higher, as these releases contain the necessary code corrections for strict hostname verification in certificate validation routines. In environments where immediate patching is not feasible due to operational constraints, network segmentation should be enforced to restrict access to SCG management interfaces exclusively to trusted subnets and authorized IP ranges. Additionally, implementing mutual TLS authentication can provide an additional layer of security by requiring both client and server to present valid certificates, thereby reducing the reliance on single-sided validation that contains this flaw. Security teams should also monitor for anomalous traffic patterns indicative of certificate manipulation or unexpected SSL/TLS handshake failures which may signal exploitation attempts against this vulnerability.