CVE-2011-1889
Published 2011-06-16 · Updated 2026-06-16 · Source secure@microsoft.com
Summary
CVE-2011-1889 is a critical-severity (CVSS 9.8) vulnerability in Microsoft Forefront Threat Management Gateway (TMG). CISA added it to the Known Exploited Vulnerabilities catalog on March 3, 2022, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by March 24, 2022. CISA does not currently list it as used in ransomware campaigns. Microsoft has 390 vulnerabilities in the KEV catalog, 117 of them linked to ransomware.
All 390 known-exploited Microsoft vulnerabilities →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 vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA Known-Exploited Vulnerability
Product: Microsoft — Forefront Threat Management Gateway (TMG)
Name: Microsoft Forefront TMG Remote Code Execution Vulnerability
Date added: 2022-03-03 · Due: 2022-03-24
Required action: Apply updates per vendor instructions.
References
- http://secunia.com/advisories/44857
- http://www.securityfocus.com/bid/48181
- http://www.securitytracker.com/id?1025637
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-040
- https://exchange.xforce.ibmcloud.com/vulnerabilities/67736
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12642
- http://secunia.com/advisories/44857
- http://www.securityfocus.com/bid/48181