CVE-2026-25907: Dell PowerScale OneFS DoS Vulnerability

CVE-2026-25907 Overview

Dell PowerScale OneFS version 9.13.0.0 contains an overly restrictive account lockout mechanism vulnerability (CWE-645). An unauthenticated attacker with remote network access could potentially exploit this vulnerability to cause denial of service conditions by triggering the account lockout mechanism inappropriately.

Critical Impact

This vulnerability enables unauthenticated remote attackers to lock out legitimate user accounts, causing denial of service and potentially disrupting critical storage operations in enterprise environments.

Affected Products

• Dell PowerScale OneFS version 9.13.0.0

Discovery Timeline

• 2026-03-04 - CVE-2026-25907 published to NVD
• 2026-03-04 - Last updated in NVD database

Technical Details for CVE-2026-25907

Vulnerability Analysis

This vulnerability stems from an overly restrictive account lockout mechanism in Dell PowerScale OneFS. The issue falls under CWE-645 (Overly Restrictive Account Lockout Mechanism), which describes conditions where the account lockout implementation can be abused to deny service to legitimate users.

The vulnerability can be exploited remotely without authentication. An attacker can trigger the account lockout mechanism through the network, effectively locking out legitimate users from accessing the PowerScale OneFS system. This type of attack is particularly damaging in enterprise storage environments where availability is critical.

Root Cause

The root cause lies in the implementation of the account lockout mechanism within Dell PowerScale OneFS 9.13.0.0. The system's lockout policy is overly restrictive, meaning that an attacker can deliberately trigger lockout conditions for user accounts without needing valid credentials. This design flaw allows the authentication subsystem to be weaponized against legitimate users.

Attack Vector

The attack vector is network-based and requires no authentication or user interaction. An attacker can remotely access the PowerScale OneFS system and submit authentication attempts designed to trigger the account lockout mechanism for targeted user accounts. By systematically targeting accounts, an attacker can cause widespread denial of service affecting storage access and administrative operations.

The attack does not require any special privileges or complex timing conditions, making it relatively straightforward for attackers to execute once they have network access to the vulnerable system.

Detection Methods for CVE-2026-25907

Indicators of Compromise

• Unusual spikes in failed authentication attempts across multiple user accounts
• Multiple accounts being locked out simultaneously or in rapid succession
• Authentication failures originating from unfamiliar or external IP addresses
• Pattern of lockouts affecting critical service accounts or administrative users

Detection Strategies

• Monitor authentication logs for abnormal patterns of failed login attempts
• Implement alerting on account lockout events, especially when multiple accounts are affected in a short timeframe
• Track source IP addresses associated with failed authentication attempts and identify anomalous origins
• Deploy network monitoring to detect reconnaissance or enumeration activity targeting authentication endpoints

Monitoring Recommendations

• Enable detailed logging for all authentication events on PowerScale OneFS systems
• Configure SIEM rules to correlate failed authentication attempts with account lockout events
• Establish baseline metrics for normal account lockout rates to identify deviations
• Monitor network traffic to OneFS management interfaces for unusual connection patterns

How to Mitigate CVE-2026-25907

Immediate Actions Required

• Review the Dell Security Update DSA-2026-095 for patching guidance
• Restrict network access to PowerScale OneFS management interfaces to trusted networks and IP addresses
• Implement network segmentation to limit exposure of authentication endpoints
• Consider implementing additional authentication rate limiting at the network perimeter

Patch Information

Dell has released a security update addressing this vulnerability. Organizations should consult the Dell Security Advisory DSA-2026-095 for specific patch details and upgrade instructions. It is recommended to apply the security update as soon as possible following your organization's change management procedures.

Workarounds

• Implement firewall rules to restrict access to OneFS authentication services from untrusted networks
• Configure network-level rate limiting on connections to authentication endpoints
• Use VPN or jump hosts to limit direct network access to PowerScale management interfaces
• Consider temporarily relaxing lockout thresholds with compensating monitoring controls until patching is complete

# Example: Restrict network access to management interfaces (conceptual)
# Consult Dell documentation for OneFS-specific firewall configuration
# Limit access to trusted management networks only
isi network firewall rules create --subnet=<trusted_management_subnet> --action=allow