Threats / Trend Micro / CVE-2019-18187
CVE-2019-18187
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
Trend Micro OfficeScan vulnerability
Trend Micro OfficeScan contains a directory traversal vulnerability in zip file extraction that enables remote code execution on affected servers.
Verdict
Today item — known-exploited.
An unauthenticated attacker can exploit improper path validation during zip extraction to write files outside intended directories, achieving arbitrary code execution on the OfficeScan server with system privileges.
01
Is it exploitable?
— the evidence, ranked above the scoreReported exploitation
4 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03).
Probability (EPSS)
EPSS 0.25125 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
Affected: Trend Micro, OfficeScan. Confirm exact fixed builds in the vendor advisory.
Weakness (CWE)
Mapped to CWE-22 Path Traversal — weakness family: Path traversal / file.CWE assignment from the public NVD record; the weakness class drives how the flaw is exploited.
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
I craft a malicious zip archive with path traversal sequences in filenames to escape the extraction directory.
Business
Endpoint protection infrastructure is compromised, eliminating security controls across protected systems.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I upload the zip file to the OfficeScan server through a vulnerable extraction routine.
Business
Attackers gain persistent access to the security management layer, enabling lateral movement and data exfiltration.
3
Lateral reach — past segmentation narrative 3
Attacker
I execute arbitrary code by placing malicious files in system directories or startup locations.
Business
Organization loses ability to detect or respond to threats, creating exposure across all managed endpoints.
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05
Coverage & confidence
— what we know, and what we don’tEstablished (cited)
Coverage gaps — stated, not hidden
Disclosure & credit2
Catalogued by trendmicroCNA
Credited with finding itNo finder named in the public CVE record — the work behind this find is unattributed.