How severe is CVE-2008-3866?

CVE-2008-3866 has a CVSS 2.0 base score of 4.6, rated medium severity.

Is CVE-2008-3866 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2008-3866?

CVE-2008-3866 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-2008-3866?

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

When was CVE-2008-3866 published?

CVE-2008-3866 was published on 2009-01-21 and last updated on 2026-06-16.

CVE-2008-3866

CVE-2008-3866 is a medium-severity vulnerability in Trend Micro Internet Security 2007 with a CVSS 2.0 base score of 4.6. 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-287.

Key facts

Severity: Medium (CVSS 2.0 base score 4.6)
EPSS exploit prediction: 0% (32nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Trend Micro Internet Security 2007
Published: 2009-01-21
Last modified: 2026-06-16

Description

The Trend Micro Personal 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, relies on client-side password protection implemented in the configuration GUI, which allows local users to bypass intended access restrictions and change firewall settings by using a modified client to send crafted packets.

Frequently asked questions

What is CVE-2008-3866?: The Trend Micro Personal 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, relies on client-side password protection implemented in the configuration GUI, which allows local users to bypass intended access restrictions and change firewall settings by using a modified client to send crafted packets.
How severe is CVE-2008-3866?: CVE-2008-3866 has a CVSS 2.0 base score of 4.6, rated medium severity.
Is CVE-2008-3866 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2008-3866?: CVE-2008-3866 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-2008-3866?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2008-3866 published?: CVE-2008-3866 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:*:*:*:*:*:*

More vulnerabilities in Trend Micro Internet Security 2007

CVE-2008-3865 — Critical (CVSS 10.0): Multiple heap-based buffer overflows in the ApiThread function in the firewall service (aka TmPfw.exe) in Trend Micro…
CVE-2008-3864 — Medium (CVSS 5.0): The ApiThread function in the firewall service (aka TmPfw.exe) in Trend Micro Network Security Component (NSC) modules,…

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Other CWE-287 (Improper Authentication) vulnerabilities

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CVE-2026-10611 — Critical (CVSS 10.0): An authentication bypass vulnerability exists in MISP when LDAP mixed authentication is enabled with OTP enforcement.…
CVE-2026-47280 — Critical (CVSS 10.0): Improper authentication in Azure Resource Manager (ARM) allows an unauthorized attacker to elevate privileges over a…
CVE-2026-42822 — Critical (CVSS 10.0): Improper authentication in Azure Local Disconnected Operations allows an unauthorized attacker to elevate privileges…
CVE-2026-20182 — Critical (CVSS 10.0): May 2026: This security advisory provides the details and fix information for a vulnerability that was discovered and…

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