CVE-2011-1889

The NSPLookupServiceNext function in the client in Microsoft Forefront Threat Management Gateway ...

9.8 CriticalIn KEV

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."

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

49.0%Down 13.3 points since Feb 4, 2022

What each source reports

NVD Score used 9.8

Record: CVE-2011-1889
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0: 10.0 HighAV:N/AC:L/Au:N/C:C/I:C/A:C
Weakness: CWE-119
Updated: 2026-11-02

CVE List 9.8

Record: CVE-2011-1889
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-119
Updated: 2026-11-02

EUVDEUVD-2011-1887 9.8

Record: EUVD-2011-1887
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

GitHub AdvisoriesGHSA-v7xg-xv38-f34w 9.8

The NSPLookupServiceNext function in the client in Microsoft Forefront Threat Management Gateway ...

Record: GHSA-v7xg-xv38-f34w
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-119
Updated: 2026-11-02

CISA KEV No score

Microsoft Forefront TMG Remote Code Execution Vulnerability

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.

Record: CVE-2011-1889
Weakness: CWE-119
Updated: 2026-11-02

Affected products

History

History
Recorded	Changed	Sources
Nov 3, 2026	exploitation
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, CISA KEV, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2011-1889 is a critical vulnerability (CVSS 9.8) in Microsoft Forefront Threat Management Gateway (tmg), published June 16, 2011. CISA lists it as known to be exploited, since March 3, 2022. EUVD reports exploitation since March 3, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 49.0%, the 98th percentile. No source names a fixed version.