CVE-2009-3676

What it is

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."

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of service disruption.

Exploit odds

34.6% chance of exploitation in the next 30 days (EPSS). Higher than most.

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2009-11-13 15:30 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-16 23:12 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 34.6% in the next 30 days (EPSS).
• Severity: 7.1 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2009-11-13 15:30 UTC

Last modified

2026-06-16 23:12 UTC

Exploit probability

34.6% · EPSS, next 30 days

Weakness

CWE-399

Record status

Modified

Affected

• Microsoft Windows 7
• Microsoft Windows Server 2008 r2

Attack profile CVSS 2.0 · 7.1

Attack vector

Network

Complexity

Medium

Authentication

None

Confidentiality

None

Integrity

None

Availability

Complete

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2009-3676.md and follow it. Check whether this project is affected by CVE-2009-3676. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

Copy as ticket · More options · Status badge