CVE-2025-67706: 
ArcGIS Server vulnerability analysis and mitigation

CVE-2025-67706 is an unrestricted file upload vulnerability (CWE-434) in Esri ArcGIS Server versions 11.5 and earlier on both Windows and Linux platforms. It allows a remote, unauthenticated attacker to upload arbitrary files to the server's designated upload directories without proper validation. The vulnerability was published on December 31, 2025, with a patch made available via Esri's ArcGIS Server Security 2025 Update 2 Patch. It carries a CVSS v3.1 base score of 5.6 (Medium), reflecting the high attack complexity and limited impact due to architectural controls that restrict uploaded files to non-executable storage locations (Feedly, Esri Advisory).

The root cause is insufficient validation of uploaded files (CWE-434: Unrestricted Upload of File with Dangerous Type), allowing unauthenticated remote attackers to submit arbitrary file types to ArcGIS Server's upload endpoints. Exploitation requires high attack complexity — specifically, race conditions, secret values, or man-in-the-middle conditions must be present. While files can be uploaded without authentication, ArcGIS Server's architecture enforces controls that restrict uploaded content to non-executable storage locations, preventing modification of application components, system configurations, or execution of uploaded payloads. The attack vector is network-based with no privileges or user interaction required (Feedly, Esri Advisory).

Successful exploitation allows remote attackers to upload arbitrary files to ArcGIS Server instances, with low impact to confidentiality, integrity, and availability. The server's built-in architectural controls prevent uploaded files from being executed, used to escalate privileges, or leveraged to access sensitive data or modify existing application components. The practical impact is therefore limited — attackers cannot achieve remote code execution, service disruption, or unauthorized data access through this vulnerability alone, and exploitation requires additional conditions such as race conditions or man-in-the-middle scenarios (Feedly).

There is no public proof-of-concept exploit and no evidence of in-the-wild exploitation as of the time of reporting. The EPSS score is approximately 0.0014 (0.14%), indicating a low probability of exploitation in the near term. The vulnerability is not listed in CISA's Known Exploited Vulnerabilities (KEV) catalog. Exploitation is further constrained by the requirement for high attack complexity, including race conditions, secret values, or man-in-the-middle conditions (Feedly).

1. Reconnaissance: Identify internet-facing ArcGIS Server instances running version 11.5 or earlier using tools like Shodan or Censys, targeting exposed file upload endpoints.
2. Establish preconditions: Set up a man-in-the-middle position, exploit a race condition, or obtain a required secret value to meet the high attack complexity requirement.
3. Craft malicious upload request: Prepare an HTTP request targeting ArcGIS Server's file upload endpoint, including an arbitrary file (e.g., a script or binary) without proper type validation.
4. Submit unauthenticated upload: Send the crafted request without authentication credentials; the server fails to validate the file type and stores the file in a designated upload directory.
5. Assess impact: Note that uploaded files are restricted to non-executable storage locations by server architecture, limiting further exploitation without additional vulnerabilities or misconfigurations (Feedly, Esri Advisory).

• Network: Unexpected or anomalous HTTP POST requests to ArcGIS Server file upload endpoints from unauthenticated or unknown source IPs; unusual volume of upload requests.
• File System: Presence of unexpected or suspicious files (e.g., scripts, binaries, or files with unusual extensions) in ArcGIS Server's designated upload directories.
• Logs: ArcGIS Server access logs showing unauthenticated file upload attempts, particularly with file types not normally associated with legitimate GIS workflows; repeated upload requests from a single IP or user agent.

Esri has released the ArcGIS Server Security 2025 Update 2 Patch to address this vulnerability; organizations running ArcGIS Server version 11.5 or earlier should apply this patch immediately. If immediate patching is not feasible, administrators should implement strict file upload validation at the application or WAF level, restrict file upload functionality to trusted users and networks, and limit the file types permitted for upload. Additionally, network-level access controls should be applied to reduce exposure of ArcGIS Server upload endpoints to untrusted networks, and server logs should be monitored for suspicious upload activity (Esri Advisory).

Coverage of CVE-2025-67706 has been limited to automated vulnerability tracking platforms and aggregators such as Vulners, VulDB, CVEFeed, and CIRCL's vulnerability lookup service. A brief technical summary was published by Infinit Security (Infinit Security). No significant researcher commentary, vendor statements beyond the patch advisory, or notable social media discussion has been identified for this vulnerability.