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Vulnerabilities

Vulnerability · CVE-2011-1889

Microsoft Forefront TMG Remote Code Execution Vulnerability

Published Jun 16, 2011 · catalog updated Jun 16, 2026 · Microsoft Forefront Threat Management Gateway (TMG)

Patch now

CVE-2011-1889 is in the CISA known-exploited catalog, due Mar 24, 2022. Confirm Microsoft Forefront Threat Management Gateway (TMG) against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
Severity
Critical9.8
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
49.02%
Remediation
Remediation guidance
Affected products
cpe microsoft/forefront threat management gateway · vendor Microsoft Forefront Threat Management Gateway (TMG) · vendor n/a n/a

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."

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe microsoft/forefront threat management gateway2010
  • vendor Microsoft Forefront Threat Management Gateway (TMG)version unspecified
  • vendor n/a n/aversion unspecified

How to fix CVE-2011-1889

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2011-1889 is in the CISA known-exploited catalog, due Mar 24, 2022. Confirm Microsoft Forefront Threat Management Gateway (TMG) against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Compare what you have installed with microsoft/forefront threat management gateway 2010. Apply updates per vendor instructions.

What should an analyst verify?

CWE-119: Buffer Overflow. EPSS 49.02%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jun 16, 2011 · Catalog

    Detected

    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."

  2. Mar 3, 2022 · CISA KEV

    Known exploited

    Apply updates per vendor instructions.

  3. Mar 24, 2022 · CISA KEV

    Remediation due

    Apply updates per vendor instructions.

  4. Jun 16, 2026 · Catalog

    Updated

    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."

Sources

  • CISA KEVConfirmed exploitationCVE-2011-1889

    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.

    cisa.gov
  • CVE.orgVulnerability recordCVE-2011-1889

    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."

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2011-1889

    30-day exploitation probability 49.0%

    first.org
  • NIST NVDVulnerability recordCVE-2011-1889

    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."

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2011-1889

    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.

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.