CVE-2006-1591

CVE-2006-1591 is a medium-severity vulnerability in Microsoft Windows 2000 with a CVSS 2.0 base score of 5.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

• Severity: Medium (CVSS 2.0 base score 5.1)
• EPSS exploit prediction: 7% (93rd percentile)
• Actively exploited: Not listed in CISA KEV
• Affected product: Microsoft Windows 2000
• Published: 2006-04-03
• Last modified: 2026-06-16

Description

Heap-based buffer overflow in Microsoft Windows Help winhlp32.exe allows user-assisted attackers to execute arbitrary code via crafted embedded image data in a .hlp file.

Frequently asked questions

What is CVE-2006-1591?

Heap-based buffer overflow in Microsoft Windows Help winhlp32.exe allows user-assisted attackers to execute arbitrary code via crafted embedded image data in a .hlp file.

How severe is CVE-2006-1591?

CVE-2006-1591 has a CVSS 2.0 base score of 5.1, rated medium severity.

Is CVE-2006-1591 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (93rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2006-1591?

CVE-2006-1591 primarily affects Microsoft Windows 2000. In total, 52 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2006-1591?

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

When was CVE-2006-1591 published?

CVE-2006-1591 was published on 2006-04-03 and last updated on 2026-06-16.

References

• http://lists.grok.org.uk/pipermail/full-disclosure/2006-March/044748.html
• http://securityreason.com/securityalert/700
• http://www.open-security.org/advisories/15
• http://www.securityfocus.com/archive/1/430871/100/0/threaded
• http://www.securityfocus.com/bid/17325
• https://exchange.xforce.ibmcloud.com/vulnerabilities/25573

Affected products (52)

• cpe:2.3:o:microsoft:windows_2000:*:*:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_2000:*:sp1:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_2000:*:sp2:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_2000:*:sp3:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_2000:*:sp4:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_2003_server:enterprise:*:64-bit:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_2003_server:enterprise:sp1:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_2003_server:r2:*:64-bit:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_2003_server:r2:sp1:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_2003_server:standard:*:64-bit:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_2003_server:standard:sp1:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_2003_server:web:*:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_2003_server:web:sp1:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_nt:4.0:*:server:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_nt:4.0:*:terminal_server:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_nt:4.0:*:workstation:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_nt:4.0:sp1:enterprise:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_nt:4.0:sp1:server:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_nt:4.0:sp1:terminal_server:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_nt:4.0:sp1:workstation:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_nt:4.0:sp2:enterprise:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_nt:4.0:sp2:server:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_nt:4.0:sp2:terminal_server:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_nt:4.0:sp2:workstation:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_nt:4.0:sp3:enterprise:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_nt:4.0:sp3:server:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_nt:4.0:sp3:terminal_server:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_nt:4.0:sp3:workstation:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_nt:4.0:sp4:enterprise:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_nt:4.0:sp4:server:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_nt:4.0:sp4:terminal_server:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_nt:4.0:sp4:workstation:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_nt:4.0:sp5:enterprise:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_nt:4.0:sp5:server:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_nt:4.0:sp5:terminal_server:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_nt:4.0:sp5:workstation:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_nt:4.0:sp6:enterprise:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_nt:4.0:sp6:server:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_nt:4.0:sp6:terminal_server:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_nt:4.0:sp6:workstation:*:*:*:*:*

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