CVE-2025-27695: Dell Wyse Management Suite Auth Bypass

CVE-2025-27695 Overview

CVE-2025-27695 is an Authentication Bypass by Spoofing vulnerability [CWE-290] affecting Dell Wyse Management Suite (WMS) versions prior to 5.1. The flaw allows a remote attacker with high privileges to bypass authentication controls through spoofing, leading to unauthorized information disclosure. Dell published the issue in security advisory DSA-2025-135 on May 8, 2025.

Exploitation requires network access and existing high-privileged credentials, which limits the attack surface. However, successful exploitation exposes sensitive configuration and management data handled by the WMS platform used to manage Dell Wyse thin clients at scale.

Critical Impact
A remote, high-privileged attacker can spoof authentication in Dell Wyse Management Suite prior to 5.1 and read confidential data managed by the platform.

Affected Products

Dell Wyse Management Suite versions prior to 5.1
Deployments managing Dell Wyse thin client endpoints
On-premises WMS installations exposed to internal networks

Discovery Timeline

2025-05-08 - CVE-2025-27695 published to NVD with Dell advisory DSA-2025-135
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-27695

Vulnerability Analysis

Dell Wyse Management Suite is a centralized administration platform for Dell Wyse thin and zero clients. It handles device enrollment, policy distribution, firmware updates, and remote configuration across enterprise fleets. A weakness in its authentication logic allows an attacker to impersonate a legitimate identity, bypassing intended access verification.

Because the vulnerability requires high privileges to exploit, the primary risk scenario involves an authenticated insider or an attacker who has already compromised a privileged account. Once the spoofing bypass succeeds, the attacker gains read access to information they were not authorized to view. Neither integrity nor availability are directly impacted, but disclosed data may include device inventories, configuration policies, and administrative metadata that support follow-on attacks.

Root Cause

The vulnerability is classified as CWE-290: Authentication Bypass by Spoofing. WMS validates identity using data that can be forged or replayed by an attacker who controls request contents. When the server trusts these client-supplied identity attributes without cryptographic verification or an independent binding to session state, an attacker can present another principal's identifier and be treated as that principal for the purposes of information retrieval.

Attack Vector

The vulnerability manifests over the network against the WMS management interface. An attacker with existing high-privileged access sends crafted requests that spoof identity attributes accepted by the authentication layer. The request path does not require user interaction, and no scope change occurs. Refer to the Dell Security Advisory DSA-2025-135 for vendor-specific details on the affected components and request patterns.

Detection Methods for CVE-2025-27695

Indicators of Compromise

Authentication events in WMS logs where the source client identifier does not match expected administrative workstations or service accounts.
Unusual bulk read or export operations against device inventory, policies, or user metadata originating from a single session.
Requests to WMS API endpoints containing identity or session tokens that repeat across mismatched source IP addresses.

Detection Strategies

Correlate WMS application logs with network flow data to identify sessions where authenticated identity does not align with the network origin.
Baseline normal administrator activity in WMS and alert on deviations in read volume, endpoint enumeration, or off-hours access.
Monitor for repeated failed authentication attempts followed by a successful session from the same source, which may indicate spoofing experimentation.

Monitoring Recommendations

Forward WMS authentication and API access logs to a centralized SIEM for long-term retention and correlation.
Alert on privileged WMS account usage from unexpected networks, geographies, or endpoints.
Track configuration or inventory export operations and require secondary review for high-volume queries.

How to Mitigate CVE-2025-27695

Immediate Actions Required

Upgrade Dell Wyse Management Suite to version 5.1 or later as directed in Dell Security Advisory DSA-2025-135.
Rotate credentials for all WMS administrative accounts after applying the patch.
Review WMS access logs for the preceding 90 days for evidence of anomalous authenticated activity.

Patch Information

Dell resolved CVE-2025-27695 in Wyse Management Suite 5.1. Administrators should follow the upgrade path documented in the vendor advisory and confirm that all WMS servers, including redundant or standby instances, are updated. Restart services and validate that all administrative accounts authenticate successfully after the upgrade.

Workarounds

Restrict network access to the WMS management interface to trusted administrative subnets using firewall rules.
Enforce multi-factor authentication on the identity provider backing WMS administrator accounts where supported.
Reduce the number of accounts holding high privileges in WMS and audit remaining privileged accounts on a defined schedule.

bash

# Example: restrict inbound access to the WMS management port to a specific admin 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