CVE-2002-1561

CVE-2002-1561 is a medium-severity vulnerability in Microsoft Windows 2000 with a CVSS 2.0 base score of 5.0. Its EPSS exploit-prediction score of 43% places it in the 99th percentile, indicating an elevated likelihood of exploitation.

Key facts

• Severity: Medium (CVSS 2.0 base score 5.0)
• EPSS exploit prediction: 43% (99th percentile)
• Actively exploited: Not listed in CISA KEV
• Affected product: Microsoft Windows 2000
• Published: 2003-04-02
• Last modified: 2026-06-16

Description

The RPC component in Windows 2000, Windows NT 4.0, and Windows XP allows remote attackers to cause a denial of service (disabled RPC service) via a malformed packet to the RPC Endpoint Mapper at TCP port 135, which triggers a null pointer dereference.

Frequently asked questions

What is CVE-2002-1561?

The RPC component in Windows 2000, Windows NT 4.0, and Windows XP allows remote attackers to cause a denial of service (disabled RPC service) via a malformed packet to the RPC Endpoint Mapper at TCP port 135, which triggers a null pointer dereference.

How severe is CVE-2002-1561?

CVE-2002-1561 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2002-1561 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 43% (99th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2002-1561?

CVE-2002-1561 primarily affects Microsoft Windows 2000. In total, 45 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2002-1561?

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

When was CVE-2002-1561 published?

CVE-2002-1561 was published on 2003-04-02 and last updated on 2026-06-16.

References

• http://www.kb.cert.org/vuls/id/261537
• http://www.securityfocus.com/archive/1/296114/2002-10-14/2002-10-20/0
• http://www.securityfocus.com/bid/6005
• https://docs.microsoft.com/en-us/security-updates/securitybulletins/2003/ms03-010
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A59

Affected products (45)

• 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_terminal_services:*:*:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_2000_terminal_services:*:sp1:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_2000_terminal_services:*:sp2:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_2000_terminal_services:*:sp3:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_nt:4.0:*:enterprise_server:*:*:*:*:*
• 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_server:*:*:*:*:*
• 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_server:*:*:*:*:*
• 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_server:*:*:*:*:*
• 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_server:*:*:*:*:*
• 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_server:*:*:*:*:*
• 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_server:*:*:*:*:*
• 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:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_nt:4.0:sp6a:enterprise_server:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_nt:4.0:sp6a:server:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_nt:4.0:sp6a:terminal_server:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_nt:4.0:sp6a:workstation:*:*:*:*:*

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