CVE-2011-0040

Windows 2003 Server vulnerability

CVSS

5.0

EPSS

22.8%

EPSS pct

97th

Exploited

No known

The server in Microsoft Active Directory on Windows Server 2003 SP2 does not properly handle an update request for a service principal name (SPN), which allows remote attackers to cause a denial of service (authentication downgrade or outage) via a crafted request that triggers name collisions, aka "Active Directory SPN Validation Vulnerability."

Affected vendor

Microsoft

Affected product

Windows 2003 Server

CVSS vector

AV:N/AC:L/Au:N/C:N/I:N/A:P

Weakness type (CWE)

CWE-20 — Improper Input Validation

Published

2011-02-09

Risk analysis

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

Its EPSS score of 22.8% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 97% of all scored CVEs.

Check your external exposure to CVE-2011-0040

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-2011-0040.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2011-0040

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2011-0040 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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