How severe is CVE-2009-3676?

CVE-2009-3676 has a CVSS 2.0 base score of 7.1, rated high severity.

Is CVE-2009-3676 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 34% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-3676?

CVE-2009-3676 primarily affects Microsoft Windows 7. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-3676?

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

When was CVE-2009-3676 published?

CVE-2009-3676 was published on 2009-11-13 and last updated on 2026-06-16.

CVE-2009-3676

CVE-2009-3676 is a high-severity vulnerability in Microsoft Windows 7 with a CVSS 2.0 base score of 7.1. Its EPSS exploit-prediction score of 34% places it in the 98th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-399.

Key facts

Severity: High (CVSS 2.0 base score 7.1)
EPSS exploit prediction: 34% (98th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-399
Affected product: Microsoft Windows 7
Published: 2009-11-13
Last modified: 2026-06-16

Description

The SMB client in the kernel in Microsoft Windows Server 2008 R2 and Windows 7 allows remote SMB servers and man-in-the-middle attackers to cause a denial of service (infinite loop and system hang) via a (1) SMBv1 or (2) SMBv2 response packet that contains (a) an incorrect length value in a NetBIOS header or (b) an additional length field at the end of this response packet, aka "SMB Client Incomplete Response Vulnerability."

Frequently asked questions

What is CVE-2009-3676?: The SMB client in the kernel in Microsoft Windows Server 2008 R2 and Windows 7 allows remote SMB servers and man-in-the-middle attackers to cause a denial of service (infinite loop and system hang) via a (1) SMBv1 or (2) SMBv2 response packet that contains (a) an incorrect length value in a NetBIOS header or (b) an additional length field at the end of this response packet, aka "SMB Client Incomplete Response Vulnerability."
How severe is CVE-2009-3676?: CVE-2009-3676 has a CVSS 2.0 base score of 7.1, rated high severity.
Is CVE-2009-3676 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 34% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-3676?: CVE-2009-3676 primarily affects Microsoft Windows 7. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-3676?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2009-3676 published?: CVE-2009-3676 was published on 2009-11-13 and last updated on 2026-06-16.

References

Affected products (2)

cpe:2.3:o:microsoft:windows_7:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2008:r2:*:*:*:*:*:*:*

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