How severe is CVE-2019-18187?

CVE-2019-18187 has a CVSS score of 7.5/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by CVE-2019-18187?

Affected package information for CVE-2019-18187 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2019-18187?

No fixed version has been published for CVE-2019-18187 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2019-18187 actively exploited in the wild?

Yes. There are 2 known exploit references for CVE-2019-18187, including 2 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2019-18187?

CVE-2019-18187 has an EPSS (Exploit Prediction Scoring System) score of 80.6%, placing it in the 99th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

Is CVE-2019-18187 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2019-18187 (Trend Micro OfficeScan Directory Traversal Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2021-11-03. CISA required all US federal civilian agencies to remediate this vulnerability by 2022-05-03. The required action was: Apply updates per vendor instructions. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

What type of vulnerability is CVE-2019-18187?

CVE-2019-18187 is classified as Path Traversal (CWE-22). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

Which products and versions are affected by CVE-2019-18187?

CVE-2019-18187 affects trendmicro officescan (2 versions, e.g. 11.0, xg). Check the affected-products list on this page against your deployed version to confirm exposure.

When was CVE-2019-18187 published, and has it been updated?

CVE-2019-18187 was published on October 28, 2019 and was last updated on October 30, 2025. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV·Added 2021-11-03 — agencies required to remediate by 2022-05-03

CVE-2019-18187

HIGH

Trend Micro OfficeScan versions 11.0 and XG (12.0) could be exploited by an attacker utilizing a directory traversal vulnerability to extract files from an arbitrary zip file to a specific…

Published

Oct 28, 2019

Updated

Oct 30, 2025

Affected

0 pkgs

Patched

None yet

Exploits

2 known

EPSS Exploitation Probability

via FIRST.org ↗

80.6%probability of exploitation in next 30 days

Very High Risk99th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Description

Trend Micro OfficeScan versions 11.0 and XG (12.0) 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.

Affected Products

1 product · 3 configurations

Application

officescantrendmicro

2 versions

11.0xg

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

Trend Micro OfficeScan versions 11.0 and XG (12.0) could be exploited by…

success.trendmicro.comGoogle-sheetOct 2019

Trend Micro OfficeScan versions 11.0 and XG (12.0) could be exploited by…

cisa.govCISAJul 2021

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2019-18187 in your stack?

O3 detects CVE-2019-18187 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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