How severe is CVE-2008-3864?

CVE-2008-3864 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2008-3864 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2008-3864?

CVE-2008-3864 primarily affects Trend Micro Internet Security 2007. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2008-3864?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2008-3864 published?

CVE-2008-3864 was published on 2009-01-21 and last updated on 2026-06-16.

CVE-2008-3864

CVE-2008-3864 is a medium-severity vulnerability in Trend Micro Internet Security 2007 with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-20.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 2% (79th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Trend Micro Internet Security 2007
Published: 2009-01-21
Last modified: 2026-06-16

Description

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.

Frequently asked questions

What is CVE-2008-3864?: 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.
How severe is CVE-2008-3864?: CVE-2008-3864 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2008-3864 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2008-3864?: CVE-2008-3864 primarily affects Trend Micro Internet Security 2007. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2008-3864?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2008-3864 published?: CVE-2008-3864 was published on 2009-01-21 and last updated on 2026-06-16.

References

Affected products (3)

cpe:2.3:a:trend_micro:internet_security_2007:*:*:*:*:*:*:*:*
cpe:2.3:a:trend_micro:internet_security_2008:17.0.1224:*:*:*:*:*:*:*
cpe:2.3:a:trend_micro:officescan:8.0:sp1:*:*:*:*:*:*

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