Description

Dell Secure Connect Gateway (SCG) 5.0 Appliance, versions prior to 5.36.00.xx, contains an Improper Certificate Validation vulnerability. An unauthenticated attacker with remote access could potentially exploit this vulnerability, leading to protection mechanism bypass.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "3.7",
  "pubDate": "2026-09-09T15:17:10.100Z",
  "pubdate": "2026-09-09T15:17:10.100Z",
  "executiveSummary": "Dell Secure Connect Gateway (SCG) 5.0 appliance versions prior to 5.36.00.xx are susceptible to an improper certificate validation vulnerability. This security flaw resides in the appliance's handling of cryptographic identity verification during established connections.\nThe vulnerability allows an unauthenticated, remote attacker to bypass critical protection mechanisms by exploiting the lack of robust certificate verification. By circumventing the identity validation process, an attacker may perform man-in-the-middle (MitM) attacks, intercept sensitive data in transit, or impersonate legitimate endpoints to which the gateway connects.\nThis represents a significant security risk, as the integrity and confidentiality of communication channels are compromised. The exploitation does not require prior authentication, effectively lowering the barrier for entry for remote threat actors who have network access to the gateway appliance.\nThe primary impact involves the erosion of trust in secure communication, potentially leading to unauthorized data exposure or the injection of malicious traffic into the management environment.",
  "technicalDetails": "The vulnerability is characterized as an Improper Certificate Validation issue, where the Dell Secure Connect Gateway (SCG) fails to adequately verify the authenticity and integrity of SSL/TLS certificates presented by remote entities during the negotiation process.\nIn a standard secure communication flow, a client must validate the server's certificate against a trusted certificate authority (CA) chain and verify the identity binding, including checking for expiration, revocation status, and Subject Alternative Name (SAN) consistency.\nIn the affected versions of the SCG, the implementation fails to enforce these strict verification requirements. Consequently, the application may establish encrypted tunnels with unauthorized or malicious servers that present untrusted, self-signed, or spoofed certificates.\nThe attack flow typically involves an attacker positioning themselves in a man-in-the-middle capacity. By intercepting the outbound or inbound traffic of the SCG, the attacker can present a forged certificate. Because the application logic does not perform a rigorous check of the certificate chain, it accepts the connection as legitimate.\nOnce the connection is established, the protection mechanisms intended to guard against unauthorized access and traffic redirection are bypassed. This enables the attacker to decrypt, log, and potentially modify the traffic flowing through the SCG, effectively breaking the secure trust model of the appliance.\nThe vulnerability is present in SCG 5.0 versions prior to 5.36.00.xx. Because the vulnerability is remotely exploitable without authentication, the network exposure is significant, particularly if the appliance's management interface or egress traffic points are reachable from untrusted network segments.\nThe root cause is a failure in the application's underlying transport security library or the custom implementation of the TLS handshake, where security flags related to peer verification have been incorrectly configured or are missing entirely. Post-exploitation impact includes full traffic interception capability, potential credential harvesting if authentication headers are passed over the compromised session, and the risk of command injection if the appliance relies on the server's response to perform automated updates or configuration fetches."
}