How severe is CVE-2007-6255?

CVE-2007-6255 has a CVSS 2.0 base score of 9.3, rated critical severity.

Is CVE-2007-6255 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 30% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2007-6255?

CVE-2007-6255 primarily affects Microsoft Windows 2000. In total, 14 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2007-6255?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2007-6255 published?

CVE-2007-6255 was published on 2008-04-23 and last updated on 2026-06-16.

CVE-2007-6255

CVE-2007-6255 is a critical-severity vulnerability in Microsoft Windows 2000 with a CVSS 2.0 base score of 9.3. Its EPSS exploit-prediction score of 30% places it in the 98th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-119.

Key facts

Severity: Critical (CVSS 2.0 base score 9.3)
EPSS exploit prediction: 30% (98th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Microsoft Windows 2000
Published: 2008-04-23
Last modified: 2026-06-16

Description

Buffer overflow in the Microsoft HeartbeatCtl ActiveX control in HRTBEAT.OCX allows remote attackers to execute arbitrary code via the Host argument to an unspecified method.

Frequently asked questions

What is CVE-2007-6255?: Buffer overflow in the Microsoft HeartbeatCtl ActiveX control in HRTBEAT.OCX allows remote attackers to execute arbitrary code via the Host argument to an unspecified method.
How severe is CVE-2007-6255?: CVE-2007-6255 has a CVSS 2.0 base score of 9.3, rated critical severity.
Is CVE-2007-6255 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 30% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2007-6255?: CVE-2007-6255 primarily affects Microsoft Windows 2000. In total, 14 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2007-6255?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2007-6255 published?: CVE-2007-6255 was published on 2008-04-23 and last updated on 2026-06-16.

References

Affected products (14)

cpe:2.3:o:microsoft:windows_2000:-:sp4:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2003:-:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2003:-:sp1:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2003:-:sp1:*:*:*:*:itanium:*
cpe:2.3:o:microsoft:windows_server_2003:-:sp2:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2003:-:sp2:*:*:*:*:itanium:*
cpe:2.3:o:microsoft:windows_server_2003:-:sp2:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_xp:-:*:*:*:professional:*:x64:*
cpe:2.3:o:microsoft:windows_xp:-:sp2:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_xp:-:sp2:*:*:professional:*:x64:*
cpe:2.3:o:microsoft:windows_vista:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_vista:-:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_xp:-:*:professional:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_xp:-:sp2:professional:*:*:*:x64:*

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