THREATPORT/VULNERABILITY/CVE-2011-0661
HIGH SEVERITY

CVE-2011-0661

Windows 2003 Server vulnerability

CVSS
10.0
EPSS
45.5%
EPSS pct
99th
Exploited
No known
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."
Affected vendor
Microsoft
Affected product
Windows 2003 Server
CVSS vector
AV:N/AC:L/Au:N/C:C/I:C/A:C
Weakness type (CWE)
  • CWE-20 — Improper Input Validation
Published
2011-04-13

Risk analysis

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

Its EPSS score of 45.5% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it among the most exploited CVEs currently tracked.

Check your external exposure to CVE-2011-0661

  • Confirm whether Microsoft Windows 2003 Server is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2011-0661.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2011-0661

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2011-0661 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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