Security readout for executives and security teams
Plain-English summary
This flaw affects Trend Micro OfficeScan 11.0 and XG 12.0. An authenticated attacker could abuse zip file handling on the OfficeScan server to place files in unintended locations, potentially leading to remote code execution. Because CISA lists it in KEV, treat it as a real-world exploited issue, not just theoretical risk.
Executive priority
Prioritize remediation promptly. This is a high-severity, authenticated path to potential RCE on an endpoint security management server, and CISA KEV confirms exploitation has occurred. The server’s security role increases operational impact if compromised.
Technical view
CVE-2019-18187 is a CWE-22 directory traversal issue in Trend Micro OfficeScan 11.0 and XG 12.0. Authenticated network access is required. The vulnerability can extract files from an arbitrary zip file into a specific server folder, potentially enabling RCE under the web service account, with permissions dependent on the web platform.
Likely exposure
Exposure is limited to organizations running Trend Micro OfficeScan 11.0 or XG 12.0. Risk is higher where the OfficeScan server or management interface is reachable by broad internal users, VPN users, or exposed administrative paths.
Exploitation context
CISA KEV inclusion indicates known exploitation. The provided sources do not describe exploitation scale, public exploit details, or exact attacker behavior. Authentication is required, but valid or compromised OfficeScan credentials could make exploitation practical.
Researcher notes
Evidence supports affected versions, directory traversal, authenticated prerequisite, potential RCE, and KEV status. The prompt source bundle does not provide fixed build numbers, exploit mechanics, or detailed indicators. Use Trend Micro’s advisory as the authoritative remediation reference.
Mitigation direction
- Inventory OfficeScan 11.0 and XG 12.0 servers immediately.
- Review Trend Micro advisory 000151730 for official fixes or workarounds.
- Apply vendor-directed updates or upgrade to a supported version.
- Restrict OfficeScan management access to trusted administrative networks.
- Audit OfficeScan accounts and remove stale or unnecessary access.
- Monitor affected servers for suspicious file writes or web service activity.
Validation and detection
- Confirm each OfficeScan server version and build against Trend Micro guidance.
- Check whether affected servers received vendor-directed remediation.
- Review access logs for unusual authenticated OfficeScan activity.
- Look for unexpected files in OfficeScan server web-accessible directories.
- Verify management interfaces are not broadly reachable.
- Confirm monitoring covers the OfficeScan web service account.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-22: File access and web shell behavior lookup
File traversal and upload weaknesses can lead teams to review file, web shell, execution, and collection telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupFile access behavior lookup
The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2019-18187 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 8.8 (3.1)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CISA KEV status
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://success.trendmicro.com/solution/000151730CVE reference · x_refsource_MISC
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-18187CVE reference · government-resource
- https://web.archive.org/web/20200215171235/https://success.trendmicro.com/solution/000151730CVE reference · vendor-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.