CVE-2025-2514 Overview
CVE-2025-2514 is an improper restriction of excessive authentication attempts vulnerability [CWE-307] affecting multiple Hitachi Virtual Storage Platform (VSP) product lines. The flaw allows unauthenticated remote attackers to perform brute-force authentication attempts against the management interface without rate limiting or account lockout enforcement. Successful exploitation can lead to disclosure of limited confidential information through credential discovery against valid accounts. The issue affects VSP G-series, F-series, E-series, and VSP One Block storage arrays running vulnerable firmware versions of DKCMAIN, GUM, and EMS components.
Critical Impact
Network-accessible authentication endpoints permit unrestricted login attempts, enabling credential brute-force attacks against enterprise storage management interfaces.
Affected Products
- Hitachi Virtual Storage Platform G130, G150, G350, G370, G700, G900
- Hitachi Virtual Storage Platform F350, F370, F700, F900
- Hitachi Virtual Storage Platform E390, E590, E790, E990, E1090 (and E390H, E590H, E790H, E1090H); VSP One Block 23, 24, 26, 28
Discovery Timeline
- 2026-05-07 - CVE-2025-2514 published to NVD
- 2026-05-07 - Last updated in NVD database
Technical Details for CVE-2025-2514
Vulnerability Analysis
The vulnerability stems from missing controls on repeated authentication attempts against management services on Hitachi VSP arrays. Without lockout thresholds or progressive delays, attackers can iterate through credential lists at network speed. The attack requires no privileges and no user interaction. Exploitation targets confidentiality only, with no direct integrity or availability impact according to the published CVSS vector.
The affected interfaces are exposed by firmware components including DKCMAIN, GUM (Gateway for Unified Management), and EMS (Embedded Management Services). These components handle administrative authentication for storage configuration, replication, and monitoring functions.
Root Cause
The root cause is the absence of an effective rate-limiting or account-lockout mechanism on the authentication code path [CWE-307]. The firmware accepts and processes successive failed login attempts without enforcing a threshold, cooldown, or anomaly detection. This design permits automated credential guessing against any valid account on the storage management interface.
Attack Vector
An attacker on the network reaches the storage array's management endpoint and submits authentication requests in rapid succession. Tools that automate password spraying or dictionary attacks can be pointed at the interface. Once valid credentials are guessed, the attacker can access management functions consistent with the compromised account's role. The vulnerability is described in Hitachi's advisory; see the Hitachi Security Information 2026 advisory for affected version ranges.
Detection Methods for CVE-2025-2514
Indicators of Compromise
- High volume of failed authentication events on VSP management interfaces (GUM, EMS, DKCMAIN) from a single source or distributed sources within a short timeframe.
- Successful logins immediately following long sequences of failed attempts on the same account.
- Authentication activity from source IPs not on documented administrator allow-lists.
Detection Strategies
- Forward storage management authentication logs to a centralized SIEM and alert on failure-rate thresholds per account and per source IP.
- Correlate failed login bursts with subsequent configuration changes on the storage array.
- Baseline normal administrator login patterns and flag deviations in time-of-day, geography, or client fingerprint.
Monitoring Recommendations
- Monitor network flows to VSP management IPs for sustained connections from non-management subnets.
- Audit account inventories on each array and disable unused service accounts that could be brute-forced.
- Review firmware version output (DKCMAIN, GUM, EMS) on a recurring schedule to confirm patched builds remain in place.
How to Mitigate CVE-2025-2514
Immediate Actions Required
- Restrict network access to VSP management interfaces using firewalls or ACLs so only authorized administrative subnets can reach them.
- Rotate administrator and service account credentials on affected arrays and enforce strong, unique passwords.
- Apply the firmware updates published by Hitachi as soon as a maintenance window permits.
Patch Information
Hitachi has released fixed firmware. Upgrade to DKCMAIN Ver 88-08-16-xx/00 with GUM Ver. 88-08-20/00, DKCMAIN Ver 93-07-26-xx/00 with GUM Ver. 93-07-26/00, DKCMAIN Ver A3-04-02-xx/00 with EMS Ver. A3-04-02/00, DKCMAIN Ver A3-03-41-xx/00 with EMS Ver. A3-03-41/00, or DKCMAIN Ver A3-03-03-xx/00 with EMS Ver. A3-03-02/00, depending on the affected model. Refer to the Hitachi Security Information 2026 advisory for model-to-version mapping.
Workarounds
- Place VSP management interfaces on isolated, out-of-band management networks reachable only via jump hosts.
- Require multi-factor authentication on jump hosts and bastion systems used to reach storage management endpoints.
- Deploy network-level rate limiting or intrusion prevention rules in front of the management interface to throttle repeated authentication attempts.
# Example: restrict VSP management interface to a management subnet
iptables -A INPUT -p tcp -s 10.10.50.0/24 --dport 443 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
