THREATPORT/VULNERABILITY/CVE-2009-3676
HIGH SEVERITY

CVE-2009-3676

Windows 7 vulnerability

CVSS
7.1
EPSS
34.3%
EPSS pct
98th
Exploited
No known
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."
Affected vendor
Microsoft
Affected product
Windows 7
CVSS vector
AV:N/AC:M/Au:N/C:N/I:N/A:C
Weakness type (CWE)
Published
2009-11-13

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, medium attack complexity, requiring no authentication. Successful exploitation leads to complete impact to availability.

Its EPSS score of 34.3% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 98% of all scored CVEs.

Check your external exposure to CVE-2009-3676

  • Confirm whether Microsoft Windows 7 is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2009-3676.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2009-3676

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2009-3676 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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