CVE-2026-79964: Dell SCG Escape Sequence Injection Vulnerability

CVE-2026-79964 Overview

CVE-2026-79964 affects Dell Secure Connect Gateway (SCG) 5.0, both the Appliance and Application editions. The flaw is an Improper Neutralization of Escape, Meta, or Control Sequences weakness [CWE-116]. An unauthenticated remote attacker can exploit this issue to launch phishing attacks against users of the gateway. Dell addressed the vulnerability in SCG 5.0 Appliance 5.36.00.16 and SCG 5.0 Application 5.36.00.00.

Critical Impact
An unauthenticated remote attacker can abuse improperly neutralized control sequences to deliver phishing content through the Dell SCG interface, compromising the confidentiality of user data.

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 (as referenced in advisory DSA-2026-382)

Discovery Timeline

2026-09-09 - CVE CVE-2026-79964 published to the National Vulnerability Database (NVD)
2026-09-09 - Last updated in NVD database

Technical Details for CVE-2026-79964

Vulnerability Analysis

Dell Secure Connect Gateway is a remote support and telemetry appliance used to relay device data to Dell support infrastructure. The vulnerable versions fail to properly neutralize escape, meta, or control sequences in output rendered by the appliance. An attacker who reaches the exposed interface across the network can inject crafted content that alters how information is displayed to legitimate users. The resulting output can be used to stage phishing content that appears to originate from the trusted Dell SCG interface.

The vulnerability affects confidentiality but does not directly impact integrity or availability of the appliance itself. Exploitation requires no authentication and no user interaction against the appliance, though the phishing payload delivered to end users depends on those users interacting with attacker-supplied content.

Root Cause

The root cause is improper output encoding, tracked as [CWE-116] Improper Neutralization of Escape, Meta, or Control Sequences. The application accepts input that contains control sequences and passes it through to an output context without adequate sanitization. When the receiving context interprets those sequences, attacker-controlled content is rendered in a way the developers did not intend.

Attack Vector

The attack vector is the network. A remote attacker sends crafted requests containing escape or control sequences to the SCG interface. The appliance echoes or persists that content and later renders it to a user. The user sees content that appears to be part of the legitimate SCG interface but was authored by the attacker. This creates a foothold for credential harvesting or redirection to attacker-controlled infrastructure.

No public proof-of-concept or exploit code is currently listed for this CVE. See the Dell Security Update DSA-2026-382 for vendor guidance.

Detection Methods for CVE-2026-79964

Indicators of Compromise

HTTP requests to the SCG management interface containing escape sequences, control characters, or encoded metacharacters in query parameters or POST bodies.
Outbound user connections from SCG-rendered pages to unfamiliar external domains that could indicate a phishing redirect.
Unexpected content or branding anomalies rendered within the SCG web interface reported by administrators.

Detection Strategies

Inspect web server and reverse-proxy logs on the SCG appliance for requests containing non-printable characters, ANSI escape codes, or HTML metacharacters in unexpected fields.
Correlate SCG access logs with user-reported phishing attempts referencing Dell support workflows.
Baseline the SCG version currently deployed and alert when it falls below the fixed builds 5.36.00.16 (Appliance) or 5.36.00.00 (Application).

Monitoring Recommendations

Monitor administrator and technician access to the SCG web console for anomalous content or redirects.
Forward SCG audit logs to a central SIEM and alert on repeated access attempts from unauthenticated sources.
Track DNS and proxy telemetry for outbound requests originating from sessions initiated at the SCG interface.

How to Mitigate CVE-2026-79964

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 access to the SCG management interface to trusted administrative networks only.
Notify support technicians and end users of the phishing risk until patches are applied.

Patch Information

Dell has published fixes in advisory DSA-2026-382. Administrators should download the updated SCG builds directly from Dell and follow the vendor upgrade procedure. Full details are available in the Dell Security Update DSA-2026-382.

Workarounds

Place the SCG appliance behind a reverse proxy or web application firewall that filters control and escape sequences from inbound requests.
Limit inbound access to the SCG interface using firewall rules or network segmentation until the patch is deployed.
Provide user awareness guidance so technicians recognize phishing content that appears to originate from the SCG interface.

bash

# Example firewall restriction limiting SCG access to a management 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