Security readout for executives and security teams
Plain-English summary
Trend Micro Apex One build 11110 has a critical unauthenticated file upload flaw. A remote attacker could send a malformed request that writes files into the server’s SampleSubmission directory and potentially fill the server disk, disrupting endpoint security operations.
Executive priority
Treat as urgent for any Apex One build 11110 deployment. The main business risk is loss of endpoint security availability through remote disk exhaustion, with no authentication required.
Technical view
CVE-2023-0587 is a CWE-434 file upload issue in Apex One server build 11110. The source describes malformed Content-Length handling in HTTP PUT requests to /officescan/console/html/cgi/fcgiOfcDDA.exe, allowing unauthenticated file uploads to \PCCSRV\TEMP\SampleSubmission. CVSS is 9.1 with network, low-complexity, no-privilege exploitation characteristics.
Likely exposure
Exposure is limited by the provided sources to Trend Micro Apex One server build 11110, especially where the Apex One server is reachable by untrusted networks or the internet.
Exploitation context
The sources describe unauthenticated remote upload and disk-fill impact. The bundle does not include CISA KEV status or any cited evidence of active exploitation, so active exploitation should not be assumed.
Researcher notes
Do not infer code execution from the provided bundle. The documented impact is arbitrary file upload into SampleSubmission and potential filesystem exhaustion. Patch details are not provided here; remediation should be grounded in vendor guidance.
Mitigation direction
- Inventory Apex One servers and identify build 11110.
- Check Trend Micro guidance for fixed builds or supported remediation.
- Restrict Apex One server access to trusted administration networks.
- Monitor SampleSubmission and server disk usage for abnormal growth.
- Preserve suspicious uploaded files for incident review before deletion.
Validation and detection
- Confirm Apex One server build numbers from management interfaces or asset records.
- Verify whether the affected CGI path is reachable from untrusted networks.
- Review web logs for unusual PUT requests to fcgiOfcDDA.exe.
- Check \PCCSRV\TEMP\SampleSubmission for unexpected or rapidly growing files.
- Validate disk capacity alerts exist for the Apex One server volume.
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-434: 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 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-2023-0587 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
- Critical
- CVSS
- 9.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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.
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:N/UI:N/S:U/C:N/I:H/A:H3.95.2Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.1CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.tenable.com/security/research/tra-2023-5CVE reference
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.
Unrestricted Upload of File with Dangerous Type
Unrestricted Upload of File with Dangerous Type represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.