How severe is CVE-2005-1649?

CVE-2005-1649 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2005-1649 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 22% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2005-1649?

CVE-2005-1649 primarily affects Microsoft Windows 2003 Server. In total, 24 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2005-1649?

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

When was CVE-2005-1649 published?

CVE-2005-1649 was published on 2005-05-18 and last updated on 2026-06-16.

CVE-2005-1649

CVE-2005-1649 is a medium-severity vulnerability in Microsoft Windows 2003 Server with a CVSS 2.0 base score of 5.0. Its EPSS exploit-prediction score of 22% places it in the 97th percentile, indicating an elevated likelihood of exploitation.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 22% (97th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Microsoft Windows 2003 Server
Published: 2005-05-18
Last modified: 2026-06-16

Description

The IPv6 support in Windows XP SP2, 2003 Server SP1, and Longhorn, with Windows Firewall turned off, allows remote attackers to cause a denial of service (CPU consumption) via a TCP packet with the SYN flag set and the same destination and source address and port, a variant of CVE-2005-0688 and a reoccurrence of the "Land" vulnerability (CVE-1999-0016).

Frequently asked questions

What is CVE-2005-1649?: The IPv6 support in Windows XP SP2, 2003 Server SP1, and Longhorn, with Windows Firewall turned off, allows remote attackers to cause a denial of service (CPU consumption) via a TCP packet with the SYN flag set and the same destination and source address and port, a variant of CVE-2005-0688 and a reoccurrence of the "Land" vulnerability (CVE-1999-0016).
How severe is CVE-2005-1649?: CVE-2005-1649 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2005-1649 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 22% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2005-1649?: CVE-2005-1649 primarily affects Microsoft Windows 2003 Server. In total, 24 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2005-1649?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2005-1649 published?: CVE-2005-1649 was published on 2005-05-18 and last updated on 2026-06-16.

References

Affected products (24)

cpe:2.3:o:microsoft:windows_2003_server:datacenter_64-bit:sp1:*:*:*:*:*:*
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:enterprise_64-bit:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_2003_server:enterprise_64-bit:sp1:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_2003_server:r2:*:64-bit:*:*:*:*:*
cpe:2.3:o:microsoft:windows_2003_server:r2:*:datacenter_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_xp:*:*:64-bit:*:*:*:*:*
cpe:2.3:o:microsoft:windows_xp:*:*:embedded:*:*:*:*:*
cpe:2.3:o:microsoft:windows_xp:*:*:home:*:*:*:*:*
cpe:2.3:o:microsoft:windows_xp:*:*:media_center:*:*:*:*:*
cpe:2.3:o:microsoft:windows_xp:*:gold:professional:*:*:*:*:*
cpe:2.3:o:microsoft:windows_xp:*:sp1:64-bit:*:*:*:*:*
cpe:2.3:o:microsoft:windows_xp:*:sp1:embedded:*:*:*:*:*
cpe:2.3:o:microsoft:windows_xp:*:sp1:home:*:*:*:*:*
cpe:2.3:o:microsoft:windows_xp:*:sp1:media_center:*:*:*:*:*
cpe:2.3:o:microsoft:windows_xp:*:sp2:home:*:*:*:*:*
cpe:2.3:o:microsoft:windows_xp:*:sp2:media_center:*:*:*:*:*
cpe:2.3:o:microsoft:windows_xp:*:sp2:tablet_pc:*:*:*:*:*

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