CVE-2025-23092: Mitel OpenScape Path Traversal Vulnerability

CVE-2025-23092 Overview

CVE-2025-23092 is a path traversal vulnerability affecting Mitel OpenScape Accounting Management through version V5 R1.1.0. The flaw stems from insufficient sanitization of user-supplied input in the management interface. An authenticated attacker holding administrative privileges can traverse outside the intended directory structure to write files to arbitrary locations on the underlying system. Successful exploitation enables arbitrary file upload and execution of unauthorized commands on the host. The vulnerability is tracked under CWE-22 (Improper Limitation of a Pathname to a Restricted Directory).

Critical Impact
Authenticated administrators can upload arbitrary files and execute unauthorized commands on affected Mitel OpenScape Accounting Management deployments, leading to full system compromise.

Affected Products

Mitel OpenScape Accounting Management V5 R1.0.0
Mitel OpenScape Accounting Management V5 R1.1.0
All prior releases through V5 R1.1.0

Discovery Timeline

2025-06-23 - CVE-2025-23092 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-23092

Vulnerability Analysis

The vulnerability resides in the file handling logic of Mitel OpenScape Accounting Management, a billing and accounting platform for OpenScape Voice deployments. The application accepts file paths or filenames from authenticated administrative users without validating directory traversal sequences such as ../ or absolute path references. As a result, attackers can direct file write operations to locations outside the application's intended upload directory.

Because the affected functionality requires administrative authentication, the attack surface is limited to scenarios where an attacker has either compromised administrator credentials or already operates as a privileged insider. However, the impact extends beyond the application boundary. By placing files into web-accessible directories or system paths interpreted by service processes, an attacker can transition from arbitrary file write to arbitrary command execution under the privileges of the OpenScape service account.

The Exploit Prediction Scoring System (EPSS) currently rates this issue at 0.819%.

Root Cause

The root cause is missing canonicalization and validation of user-controlled path components before they are concatenated with a base directory. The application does not reject filenames containing traversal sequences, nor does it confirm that the resolved path remains within the permitted upload directory. This is a textbook CWE-22 pattern.

Attack Vector

The attack vector is network-based and requires high privileges. An authenticated administrator submits a crafted upload request containing path traversal sequences in the filename or destination parameter. The server writes the attacker-supplied content to the traversed path. By targeting directories used for scripts, scheduled tasks, or web content, the attacker achieves code execution. Refer to Mitel Security Advisory MISA-2025-0006 for vendor-confirmed exploitation details.

No verified public proof-of-concept code is available at this time. The vulnerability mechanism is described in prose because no validated exploitation samples have been published.

Detection Methods for CVE-2025-23092

Indicators of Compromise

Unexpected files appearing outside the OpenScape Accounting Management upload directory, particularly in web roots, cron directories, or service binary paths.
HTTP request logs containing traversal sequences such as ../, ..\, or URL-encoded variants (%2e%2e%2f) in upload-related endpoints.
New or modified scripts owned by the OpenScape service account in system directories.
Outbound network connections from the OpenScape host to unfamiliar IP addresses following administrative login events.

Detection Strategies

Inspect application and reverse proxy logs for upload requests where the filename parameter contains .., /, or \ characters.
Hunt for command execution by the OpenScape service user that deviates from baseline process lineage.
Correlate administrative authentication events with subsequent file creation events on the OpenScape host.

Monitoring Recommendations

Enable file integrity monitoring on the OpenScape installation directory and adjacent system paths.
Forward authentication, web access, and process execution telemetry to a centralized SIEM for correlation.
Alert on any administrative session originating from atypical source addresses or outside business hours.

How to Mitigate CVE-2025-23092

Immediate Actions Required

Apply the fixed release from Mitel as documented in MISA-2025-0006.
Rotate all OpenScape Accounting Management administrator credentials following patching.
Restrict network access to the management interface to trusted administrative subnets only.
Audit recent administrative activity and file system changes for signs of prior exploitation.

Patch Information

Mitel has published remediation guidance in advisory MISA-2025-0006. Administrators should consult the Mitel Security Advisories List to confirm the appropriate fixed version for their deployment and follow vendor upgrade procedures.

Workarounds

Place the OpenScape Accounting Management web interface behind a VPN or jump host to limit exposure.
Enforce strong, unique passwords and multi-factor authentication for all administrative accounts.
Apply least-privilege controls so that the OpenScape service account cannot write to sensitive system directories.
Monitor administrative sessions closely until the vendor patch is deployed.

bash

# Example: restrict access to the management interface via host firewall (Linux)
iptables -A INPUT -p tcp --dport 443 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP