CVE-2011-1889: Microsoft Forefront TMG Remote Code Execution Vulnerability

Vulnerability summary

CVE-2011-1889 is a high (CVSS 10.0) vulnerability in Microsoft Forefront Threat Management Gateway (TMG). It is known to be exploited: CISA lists it, first on 03-03-2022. EPSS estimates a 49.02% chance of exploitation in the next 30 days, higher than 98.8% of scored vulnerabilities.

Timeline

1. 16-06-2011
   PublishedVulnerability first disclosed.
2. 03-03-2022
   Added to CISA KEVMicrosoft Forefront TMG Remote Code Execution Vulnerability
3. 24-03-2022
   CISA remediation dueApply updates per vendor instructions.
4. 22-10-2025
   Last modifiedVulnerability information updated.

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."

• CWE-119Improper Restriction of Operations within the Bounds of a Memory BufferThe product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.