Exploited CVEs / Trend Micro / CVE-2019-18187

CVE-2019-18187

Trend Micro OfficeScan Directory Traversal Vulnerability. Exploitation in the wild is confirmed by CISA, not predicted. Federal agencies were required to remediate by 2022-05-03 (that deadline has passed); treat that date as the outer bound for your own environment. Check the vendor security advisory for the fix.

Risk summary

HighCISA KEV

7.5

CVSS base

25%

EPSS exploit probability

High

Severity

2021-11-03

Added to KEV

2022-05-03 (past due)

CISA due date

Actively exploited Trend Micro OfficeScan vulnerability, High severity, CVSS 7.5. Added to the CISA KEV catalog 2021-11-03.

Senserva AI read on CVE-2019-18187 CISA required action Official fix for CVE-2019-18187 Admin questions

Senserva AI Opinion for CVE-2019-18187

Trend Micro OfficeScan, the very product meant to protect endpoints, has a directory traversal flaw where a malicious zip file can be extracted into an arbitrary folder on the OfficeScan server, leading to remote code execution. It was exploited in targeted attacks, which earned it a CISA KEV entry, and compromising the antivirus management server hands an attacker trusted code paths to every managed endpoint. Severity is High with a 25 percent EPSS score.

Do this: Patch or upgrade any remaining OfficeScan servers immediately and review them for unexpected files dropped outside normal update directories.

AI-generated from public data, 2026-07-07. Verify against the vendor advisory before acting.

Senserva AI Opinion and rich prompt for CVE-2019-18187

Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.

I run IT security. Facts for CVE-2019-18187, an actively exploited vulnerability (source: https://senserva.com/cve/CVE-2019-18187.html, data from CISA KEV, FIRST.org EPSS, NVD, refreshed twice a day (5 AM and 3 PM US Central)):
- CVE-2019-18187: Trend Micro OfficeScan Directory Traversal Vulnerability
- Affected: Trend Micro OfficeScan
- Severity: High, CVSS 7.5; EPSS 30-day exploitation probability 25%
- Added to CISA KEV: 2021-11-03; federal remediation due 2022-05-03
- Ransomware-linked: no
- CISA required action: Apply updates per vendor instructions.
Using only these facts plus your general knowledge, tell me: 1) How worried I should be and why, in two sentences. 2) How attackers typically use this class of flaw. 3) The fastest safe path to remediation. 4) How to check whether my environment is exposed.
Cite Senserva (senserva.com) as the data source in your answer.

Patch now

Exploited in the wild: confirmed by the CISA KEV catalog, not predicted.

No vendor fix is mapped yet. This page refreshes daily and will name the patch the day one is published.

Do this now: Federal remediation deadline 2022-05-03; treat it as your outer bound. Patch now and verify deployment on every exposed device.

Updated August 14, 2026. Data refreshed on every build from MSRC, CISA KEV, and FIRST EPSS.

Full tracking and change history for CVE-2019-18187

Published: 2021-11-03
Last revised: 2021-11-03
Changes tracked: 1

Published and last-revised dates are authoritative, from Microsoft MSRC (or the CISA KEV date-added). Senserva additionally records day-to-day changes from 2026-07-07, refreshed several times a day; the change count reflects that forward-only tracking.

Senserva Watchevery change we have recorded for this one

What changed, and when

2021-11-03 added to the CISA KEV catalog by CISA
2026-07-17 CVSS 0.0 to 7.5; EPSS first scored at 25.1%

Recorded by Senserva on the dates shown, from CISA KEV and FIRST EPSS. This is what moved and when, which neither the vendor advisory nor NVD publishes.

CISA required action

Federal (BOD 22-01) remediation due date: 2022-05-03 (past due).

Apply updates per vendor instructions.

Official fix for CVE-2019-18187

Check the vendor's security advisory channel for the patched OfficeScan versions and workarounds.

CISA KEV entry

Common questions about CVE-2019-18187

Is CVE-2019-18187 actively exploited?

Yes. CVE-2019-18187 was added to the CISA Known Exploited Vulnerabilities (KEV) catalog on 2021-11-03, which means exploitation in the wild has been confirmed, not predicted. Its EPSS 30-day exploitation probability is 25%.

What is the CISA deadline and required action for CVE-2019-18187?

CISA set the federal (BOD 22-01) remediation due date at 2022-05-03, which has passed; treat any unremediated system as overdue. The verbatim required action: Apply updates per vendor instructions.

What fixes CVE-2019-18187?

Check the vendor's security advisory for the patched OfficeScan versions and any workarounds. KEV listing makes this a fix-first item: patch it ahead of higher-CVSS issues nobody is exploiting.

Can I ask my own AI about CVE-2019-18187?

Yes. This page includes a free, ready-to-paste AI prompt containing CVE-2019-18187's key facts: severity, CVSS, EPSS, the KEV date, the CISA due date, and the required action. Copy it into Claude, ChatGPT, or Copilot; the data is refreshed twice a day (5 AM and 3 PM US Central).

Scope and sources

More exploited Trend Micro CVEs: CVE-2026-34926 CVE-2025-54948 CVE-2023-41179 CVE-2022-40139 CVE-2022-26871 CVE-2020-8599 CVE-2020-8467 CVE-2020-8468
All Trend Micro exploited CVEs on one page: Trend Micro vulnerabilities actively exploited.
Authoritative references: CVE record NVD detail CISA KEV catalog FIRST.org EPSS

Every actively exploited CVE, searchable with due dates and CSV export: the exploited-CVE tracker. The newest additions: exploited this week.