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CVE-2011-1889

Microsoft Forefront TMG Remote Code Execution

9.8 CRITICALActively exploited (CISA KEV)EPSS 49.0%
  1. Published16 Jun 2011
  2. Added to CISA KEV3 Mar 2022
  3. Remediation due24 Mar 2022
Actively exploited (CISA KEV)

A remote code execution vulnerability exists in the Forefront Threat Management Gateway (TMG) Firewall Client Winsock provider that could allow code execution in the security context of the client application.

Added to KEV: 3 Mar 2022Federal remediation due: 24 Mar 2022

Description

The NSPLookupServiceNext function in the client in Microsoft Forefront Threat Management Gateway (TMG) 2010 allows remote attackers to execute arbitrary code via vectors involving unspecified requests, aka "TMG Firewall Client Memory Corruption Vulnerability."

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Microsoft Forefront Threat Management Gateway2010

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

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Frequently asked

Is CVE-2011-1889 being actively exploited?

Yes. CVE-2011-1889 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 3 Mar 2022.

How severe is CVE-2011-1889?

CVE-2011-1889 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 49.0% probability of exploitation.

Which products are affected by CVE-2011-1889?

Affected products include Microsoft Forefront Threat Management Gateway.

How do I fix CVE-2011-1889?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2011-1889 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.