CVE-2025-46704: Advantech iView Path Traversal Vulnerability

CVE-2025-46704 Overview

CVE-2025-46704 is a directory traversal vulnerability in Advantech iView, a network management software used in industrial control system (ICS) environments. The flaw resides in the NetworkServlet.processImportRequest() method, where a specific parameter is not properly sanitized or normalized. An authenticated attacker with at least user-level privileges can supply crafted path values to determine the existence of arbitrary files on the server. The vulnerability is classified under CWE-22 (Improper Limitation of a Pathname to a Restricted Directory).

Critical Impact
An authenticated attacker can enumerate arbitrary files on the iView host, exposing configuration data, application internals, and other sensitive filesystem information useful for further attacks against ICS assets.

Affected Products

Advantech iView (see Advantech Firmware Details for fixed versions)
Deployments referenced in CISA ICS Advisory ICSA-25-191-08
Industrial and enterprise networks managing Advantech SNMP-based devices via iView

Discovery Timeline

2025-07-11 - CVE-2025-46704 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-46704

Vulnerability Analysis

Advantech iView exposes a Java servlet, NetworkServlet, that accepts requests for importing network configuration data. The processImportRequest() handler consumes a request parameter that identifies the file path targeted by the import operation. Because the parameter is not normalized or constrained to a safe base directory, an authenticated user can inject traversal sequences such as ../ to reference paths outside the intended import location.

The servlet then performs a filesystem operation using the tainted path. The response or observable side effects allow the attacker to infer whether a given file exists. Exploitation requires prior authentication with user-level privileges, which limits the vulnerability to insiders or attackers who already possess valid credentials.

With an EPSS score of 4.082% (90.047 percentile), the flaw ranks above most published CVEs for near-term exploitation probability despite the authentication requirement.

Root Cause

The root cause is missing path canonicalization and validation on user-supplied input in NetworkServlet.processImportRequest(). The handler trusts the parameter value as a filesystem locator without stripping traversal sequences, resolving the absolute path, or verifying that the resolved location is confined to an allow-listed directory.

Attack Vector

The vulnerability is exploited over the network against the iView web interface. An authenticated user issues an HTTP request to the import endpoint with a manipulated path parameter containing directory traversal sequences. The server processes the request and responds in a manner that discloses whether the referenced file exists on disk. No user interaction beyond the attacker's own request is required.

Since no verified proof-of-concept has been published, refer to the CISA ICS Advisory ICSA-25-191-08 for vendor-coordinated technical details.

Detection Methods for CVE-2025-46704

Indicators of Compromise

HTTP requests to iView NetworkServlet endpoints containing ../, ..\, URL-encoded %2e%2e%2f, or double-encoded traversal sequences in parameters.
Authenticated sessions from user-level accounts issuing repeated import requests referencing paths outside iView's installation directory.
Web server or application logs recording successive requests that enumerate absolute paths such as /etc/, C:\Windows\, or configuration file locations.

Detection Strategies

Deploy web application firewall (WAF) rules that inspect query and body parameters sent to iView servlet paths for directory traversal patterns.
Correlate iView authentication logs with subsequent import-related requests to flag low-privilege accounts accessing administrative endpoints.
Enable verbose logging on the iView servlet container and alert on 200/404 response patterns consistent with file existence probing.

Monitoring Recommendations

Track process-level file access originating from the iView Java process for reads outside its expected working directories.
Baseline normal HTTP request volumes and parameter distributions for NetworkServlet endpoints and alert on statistical deviations.
Forward iView web logs to a centralized SIEM and retain them long enough to support retrospective hunts for traversal-style parameters.

How to Mitigate CVE-2025-46704

Immediate Actions Required

Upgrade Advantech iView to the fixed release listed on the Advantech Firmware Details page.
Restrict network access to the iView management interface using firewall rules so only trusted management workstations can reach it.
Audit iView user accounts and remove or disable stale, shared, or over-privileged accounts that could be abused to reach the vulnerable endpoint.
Rotate credentials for any iView account that may have been exposed prior to patching.

Patch Information

Advantech has published a fixed firmware release referenced in Advantech Firmware Details and coordinated disclosure through CISA ICS Advisory ICSA-25-191-08. Apply the vendor-provided update to remediate NetworkServlet.processImportRequest() path handling. Validate the upgrade in a staging environment before rolling it out to production ICS monitoring hosts.

Workarounds

Place iView behind a reverse proxy or WAF configured to strip or reject traversal sequences in request parameters.
Enforce network segmentation so iView is unreachable from general user VLANs and only accessible from a dedicated management network.
Apply least-privilege principles to iView roles and remove access to import functionality from accounts that do not require it.

bash

# Example WAF filter (ModSecurity) to block traversal patterns in iView requests
SecRule REQUEST_URI "@contains /NetworkServlet" \
  "chain,id:1004670,phase:2,deny,status:403,\
   msg:'CVE-2025-46704 iView NetworkServlet traversal attempt'"
  SecRule ARGS "@rx (\.\./|\.\.\\|%2e%2e%2f|%2e%2e/|/%2e%2e)" "t:lowercase,t:urlDecodeUni"