The ApiThread function in the firewall service (aka TmPfw.exe) in Trend Micro Network Security Component (NSC) modules, as used in Trend Micro OfficeScan 8.0 SP1 Patch 1 and Internet Security 2007 and 2008 17.0.1224, allows remote attackers to cause a denial of service (service crash) via a packet with a large value in an unspecified size field.
Conclusion & alert: CVE-2008-3864 is rated Moderate Risk (48.2/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.66%). Mandatory action: Review affected assets and schedule remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2025-03-30 | 1.56% | 1.66% | +0.10% |
| 2 | 2025-03-29 | 1.66% | 1.56% | -0.10% |
| 3 | 2025-03-17 | — | 1.66% | — |
Full EPSS history (8 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 5.0 | 2.0 | MEDIUM |
|
10.0 | 2.9 | [email protected] |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| trend_micro | internet_security_2007 | — | cpe:2.3:a:trend_micro:internet_security_2007:*:*:*:*:*:*:*:* |
| trend_micro | internet_security_2008 | 17.0.1224 | cpe:2.3:a:trend_micro:internet_security_2008:17.0.1224:*:*:*:*:*:*:* |
| trend_micro | officescan | 8.0 | cpe:2.3:a:trend_micro:officescan:8.0:sp1:*:*:*:*:*:* |