CVE-2025-14106: Zspace Q2c NAS Firmware RCE Vulnerability

CVE-2025-14106 Overview

CVE-2025-14106 is a command injection vulnerability affecting ZSPACE Q2C NAS devices through firmware version 1.1.0210050. The flaw resides in the zfilev2_api.CloseSafe function exposed via the /v2/file/safe/close HTTP POST endpoint. Attackers manipulate the safe_dir argument to inject operating system commands that execute on the underlying NAS firmware. The issue is exploitable remotely over the network and requires only low-privileged access. The vendor confirmed the vulnerability after early disclosure and has indicated a technical fix is planned. Public exploit details have been disclosed, increasing the risk of opportunistic abuse against exposed devices.

Critical Impact
Authenticated remote attackers can inject arbitrary operating system commands through the safe_dir parameter, compromising confidentiality, integrity, and availability of affected ZSPACE Q2C NAS devices.

Affected Products

ZSPACE Q2C NAS hardware appliance
ZSPACE Q2C NAS firmware up to and including 1.1.0210050
HTTP POST request handler component exposing /v2/file/safe/close

Discovery Timeline

2025-12-05 - CVE-2025-14106 published to the National Vulnerability Database (NVD)
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-14106

Vulnerability Analysis

The vulnerability is an OS command injection [CWE-77] and broader injection weakness [CWE-74] in the ZSPACE Q2C NAS web API. The zfilev2_api.CloseSafe handler processes HTTP POST requests sent to /v2/file/safe/close and accepts a safe_dir parameter that is passed to a system shell without proper sanitization or argument separation. Because the input is concatenated into a command string, shell metacharacters injected into safe_dir are interpreted by the operating system rather than treated as data. Successful exploitation grants the attacker command execution in the context of the NAS service process, which typically runs with elevated privileges on embedded Linux firmware.

Root Cause

The root cause is improper neutralization of special elements used in an OS command. The CloseSafe routine fails to validate or escape the safe_dir argument before invoking shell functionality, allowing characters such as ;, |, &, and backticks to break out of the intended command context.

Attack Vector

Exploitation occurs over the network against the NAS HTTP service. An attacker with low-privileged credentials crafts a POST request to /v2/file/safe/close containing a malicious safe_dir value. No user interaction is required. Because NAS appliances frequently store sensitive files and are reachable from internal networks or, in misconfigured deployments, the public internet, command execution can lead to data theft, ransomware staging, or pivoting into adjacent systems. Refer to the VulDB entry #334488 and the VulDB submission #697141 for additional technical context.

Detection Methods for CVE-2025-14106

Indicators of Compromise

HTTP POST requests to /v2/file/safe/close containing shell metacharacters such as ;, |, &, $(), or backticks in the safe_dir parameter
Unexpected child processes spawned by the NAS web service (for example sh, wget, curl, nc, busybox) following requests to the safe API
Outbound connections from the NAS appliance to unfamiliar IP addresses immediately after /v2/file/safe/* activity
New cron entries, modified startup scripts, or unexpected binaries in writable firmware paths

Detection Strategies

Inspect web server and application logs for POST requests to /v2/file/safe/close and alert on non-alphanumeric content in the safe_dir field
Correlate HTTP request patterns with process creation events on the NAS to identify shell invocations chained to API calls
Apply network intrusion detection signatures matching command-injection payloads against the Q2C NAS API path

Monitoring Recommendations

Forward NAS HTTP access logs and system logs to a centralized logging or SIEM platform for retention and correlation
Monitor authentication events on the Q2C NAS, since exploitation requires a low-privileged account whose credentials may have been compromised
Baseline normal outbound traffic from the NAS appliance and alert on deviations such as unexpected DNS queries or reverse shells

How to Mitigate CVE-2025-14106

Immediate Actions Required

Restrict network access to the ZSPACE Q2C NAS management interface to trusted administrative segments and block exposure to the public internet
Rotate credentials for all NAS user accounts and disable any unused or default accounts that could provide the low-privilege foothold required for exploitation
Audit the device for signs of prior compromise, including unauthorized binaries, modified startup scripts, and unfamiliar scheduled tasks
Monitor vendor channels for the planned technical fix and apply it as soon as it is released

Patch Information

At the time of NVD publication on 2025-12-05, the vendor has confirmed the vulnerability and indicated that a technical fix is planned but not yet released. Administrators should track the VulDB CTI entry #334488 and the vendor's security disclosure document for firmware availability and apply the update to all Q2C NAS devices once published.

Workarounds

Place the NAS behind a VPN or firewall that limits access to the /v2/file/safe/* endpoints to known administrative hosts
Deploy a reverse proxy or web application firewall rule that rejects POST requests to /v2/file/safe/close containing shell metacharacters in safe_dir
Disable the file safe feature if it is not required in the environment to remove the vulnerable code path from reachable surface area

bash

# Example WAF/proxy rule concept blocking shell metacharacters in safe_dir
# (adapt syntax to your WAF or reverse proxy of choice)
location = /v2/file/safe/close {
    if ($request_method = POST) {
        if ($request_body ~* "safe_dir=[^&]*[;|&$\`\\\"\\']") {
            return 403;
        }
    }
    proxy_pass http://q2c_nas_backend;
}