CVE-2025-27692: Dell Wyse Management Suite RCE Flaw

CVE-2025-27692 Overview

CVE-2025-27692 affects Dell Wyse Management Suite (WMS) versions prior to 5.1. The flaw is an Unrestricted Upload of File with Dangerous Type weakness, classified under [CWE-434]. An authenticated attacker with high privileges and remote network access can upload files of dangerous types to the management server. Successful exploitation leads to denial of service, information disclosure, and remote code execution on the affected WMS instance. Dell published advisory DSA-2025-135 to address the issue.

Critical Impact
Remote authenticated attackers can upload malicious files to Dell Wyse Management Suite servers, leading to code execution, information disclosure, and service disruption across managed thin client fleets.

Affected Products

Dell Wyse Management Suite versions prior to WMS 5.1

Discovery Timeline

2025-04-02 - CVE-2025-27692 published to NVD
2025-07-11 - Last updated in NVD database

Technical Details for CVE-2025-27692

Vulnerability Analysis

Dell Wyse Management Suite is a centralized platform for provisioning, configuring, and managing Dell Wyse thin clients. The vulnerability resides in a file upload handler that fails to validate the type, extension, or content of uploaded files. An attacker authenticated with high privileges can submit a file containing executable or script content where only benign content types are expected.

The weakness maps to [CWE-434] Unrestricted Upload of File with Dangerous Type. Because the WMS web tier serves and processes uploaded artifacts, an attacker can stage a payload that executes within the application context. The result is full compromise of the management plane, including the ability to push malicious configurations or firmware to downstream thin clients.

Root Cause

The root cause is missing or incomplete server-side validation of uploaded files. The application accepts files without verifying the MIME type, extension allow-list, or file signature against an enforced policy. Files written to a location reachable by the web server or a downstream interpreter can be executed.

Attack Vector

Exploitation requires network access to the WMS interface and authenticated access with administrative privileges. The attacker submits a crafted upload through a vulnerable endpoint, then triggers execution of the uploaded artifact. The attack does not require user interaction. Refer to the Dell Security Advisory DSA-2025-135 for vendor-confirmed technical details.

Detection Methods for CVE-2025-27692

Indicators of Compromise

Unexpected files with executable extensions such as .jsp, .war, .exe, or .dll written under WMS upload or web-accessible directories.
New administrator sessions originating from unusual source IPs immediately preceding upload activity.
Process creation events spawned by WMS service accounts that execute scripting or shell binaries.

Detection Strategies

Monitor WMS web server logs for POST requests to upload endpoints followed by GET requests to newly created file paths.
Alert on file integrity changes within WMS installation directories and any web root associated with the service.
Correlate authentication events for high-privileged WMS accounts with subsequent file write operations on the management server.

Monitoring Recommendations

Forward WMS application, web, and OS audit logs to a centralized SIEM for retention and correlation.
Track outbound connections from the WMS host to detect post-exploitation command-and-control activity.
Review administrative account inventory regularly and disable unused privileged accounts that could be abused for this attack path.

How to Mitigate CVE-2025-27692

Immediate Actions Required

Upgrade Dell Wyse Management Suite to version 5.1 or later as directed in DSA-2025-135.
Restrict network reachability of the WMS console to management VLANs and trusted administrator workstations only.
Rotate credentials for all WMS administrative accounts and enforce multi-factor authentication where supported.

Patch Information

Dell released a fixed build in Wyse Management Suite 5.1. Apply the upgrade following guidance in the Dell Security Advisory DSA-2025-135. The advisory is the authoritative source for affected build numbers and remediation steps.

Workarounds

Limit WMS administrative access to a small, audited group of accounts until the patch is applied.
Place the WMS server behind a reverse proxy or web application firewall that enforces strict file upload policies on extensions and content types.
Disable remote access to the management interface from untrusted networks while remediation is in progress.

bash

# Configuration example - restrict WMS console access at the host firewall (Windows)
netsh advfirewall firewall add rule name="WMS-Console-Allow-Admins" ^
  dir=in action=allow protocol=TCP localport=443 ^
  remoteip=10.10.20.0/24 profile=any
netsh advfirewall firewall add rule name="WMS-Console-Block-All" ^
  dir=in action=block protocol=TCP localport=443 profile=any