CVE-2011-0661

What it is

The SMB Server service in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP1 and SP2, Windows Server 2008 Gold, SP2, R2, and R2 SP1, and Windows 7 Gold and SP1 does not properly validate fields in SMB requests, which allows remote attackers to execute arbitrary code via a malformed request in a (1) SMBv1 or (2) SMBv2 packet, aka "SMB Transaction Parsing Vulnerability."

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of data exposure, data tampering, service disruption.

Exploit odds

44.6% chance of exploitation in the next 30 days (EPSS). Higher than most.

Fix

No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

1. 2011-01-28 00:00 UTC ReservedThe CVE id was reserved by its CNA
2. 2011-04-13 18:55 UTC PublishedDisclosed publicly on CVE.org and NVD
3. 2026-06-16 23:27 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 44.6% in the next 30 days (EPSS).
• Severity: 10.0 HIGH (CVSS).
• Fix: none linked yet, which raises it.
• It meets the bar for Drop everything: critical, and exploited or very likely to be.

Details

Published

2011-04-13 18:55 UTC

Last modified

2026-06-16 23:27 UTC

Exploit probability

44.6% · EPSS, next 30 days

Weakness

CWE-20 · Improper input validation

Record status

Modified

Affected

• Microsoft Windows 2003 Server
• Microsoft Windows 7
• Microsoft Windows Server 2003
• Microsoft Windows Server 2008
• Microsoft Windows Server 2008 r2
• Microsoft Windows Vista
• Microsoft Windows Xp

Attack profile CVSS 2.0 · 10.0

Attack vector

Network

Complexity

Low

Authentication

None

Confidentiality

Complete

Integrity

Complete

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-2011-0661.md and follow it. Check whether this project is affected by CVE-2011-0661. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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