THREATPORT/VULNERABILITY/CVE-2011-1871
HIGH SEVERITY

CVE-2011-1871

Windows 7 vulnerability

CVSS
7.8
EPSS
38.5%
EPSS pct
98th
Exploited
No known
Tcpip.sys in the TCP/IP stack in Microsoft Windows Vista SP2, Windows Server 2008 SP2, R2, and R2 SP1, and Windows 7 Gold and SP1 allows remote attackers to cause a denial of service (reboot) via a series of crafted ICMP messages, aka "ICMP Denial of Service Vulnerability."
Affected vendor
Microsoft
Affected product
Windows 7
CVSS vector
AV:N/AC:L/Au:N/C:N/I:N/A:C
Weakness type (CWE)
Published
2011-08-10

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 availability.

Its EPSS score of 38.5% 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-2011-1871

  • Confirm whether Microsoft Windows 7 is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2011-1871.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2011-1871

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2011-1871 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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