Sign In with your
Trend Micro Account
Need Help?
Need More Help?

Create a technical support case if you need further support.

SECURITY BULLETIN: Trend Micro OfficeScan Arbitrary File Upload with Directory Traversal Vulnerability

    • Updated:
    • 6 May 2021
    • Product/Version:
    • OfficeScan 11.0
    • OfficeScan XG
    • Platform:
Release Date: October 28, 2019
CVE Identifier(s): CVE-2019-18187
CVSS 3.0 Score(s): 8.2
Severity Rating(s): High

Trend Micro has released Critical Patches (CP) for Trend Micro OfficeScan 11.0 SP1 and XG which resolve an arbitrary file upload with directory traversal vulnerability. 


Affected Version(s)

ProductAffected Version(s)PlatformLanguage(s)
OfficeScanXG SP1WindowsEnglish
XG (Non-SP GM build)WindowsEnglish
11.0 SP1WindowsEnglish
Please note that Trend Micro Apex One or Apex One-as-a-Service versions are NOT affected by this vulnerability.


Trend Micro has released the following solutions to address the issue:

ProductUpdated versionNotesPlatformAvailability
OfficeScanXG SP1 CP 5427ReadmeWindowsNow Available
XG CP 1962ReadmeWindowsNow Available
11.0 SP1 CP 6638ReadmeWindowsNow Available

These are the minimum versions of the patch and/or build required to address the issue. Trend Micro highly encourages customers to obtain the latest version of the product if there is a newer one available than the one listed in this bulletin.

Customers are encouraged to visit Trend Micro’s Download Center to obtain prerequisite software (such as Service Packs) before applying any of the solutions above.

Vulnerability Details

These CPs resolve the following in affected versions of Trend Micro OfficeScan 11.0 SP1 and XG:

  • CVE-2019-18187: CVSSv3 8.2 – Affected versions of OfficeScan could be exploited by an attacker utilizing a directory traversal vulnerability to extract files from an arbitrary zip file to a specific folder on the OfficeScan server, which could potentially lead to remote code execution (RCE). The remote process execution is bound to a web service account, which depending on the web platform used may have restricted permissions. An attempted attack requires user authentication.
Please note – Trend Micro has observed active attempts of potential attacks against this vulnerability in the wild. Customers are highly encouraged to update to the latest versions as soon as possible.

Mitigating Factors

Exploiting these type of vulnerabilities generally require that an attacker has access (physical or remote) to a vulnerable machine. In addition to timely application of patches and updated solutions, customers are also advised to review remote access to critical systems and ensure policies and perimeter security is up-to-date.

However, even though an exploit may require several specific conditions to be met, Trend Micro strongly encourages customers to update to the latest builds as soon as possible.


Trend Micro would like to thank the following individuals for responsibly disclosing these issues and working with Trend Micro to help protect our customers:

  • Trend Micro Research

External Reference(s)

Upgrade; Update
Solution Id:
Did this article help you?

Thank you for your feedback!

*This form is automated system. General questions, technical, sales, and product-related issues submitted through this form will not be answered.

If you need additional help, you may try to contact the support team. Contact Support

To help us improve the quality of this article, please leave your email here so we can clarify further your feedback, if neccessary:
We will not send you spam or share your email address.

*This form is automated system. General questions, technical, sales, and product-related issues submitted through this form will not be answered.