CVE-2011-1889 Microsoft Forefront TMG Remote Code Execution

Exploited in the wild Critical 9.8 Published 16 Jun 2011 Updated 22 Oct 2025

Remote attackers can execute arbitrary code on Microsoft Forefront TMG 2010 via a memory corruption vulnerability in the firewall client.

Exploited in the wild: Since 3 Mar 2022
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2011-1889?

CVE-2011-1889 is a critical memory corruption vulnerability in n/a, published on 16 Jun 2011. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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."

Weakness: CWE-119

Which versions are affected by CVE-2011-1889?

It affects 1 product.

Products include Microsoft Forefront Threat Management Gateway.

How do I fix CVE-2011-1889?

No fix has been published for CVE-2011-1889 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 24 Mar 2022.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2011-1889 being exploited?

Yes. Attackers have exploited CVE-2011-1889 in the wild since at least 3 Mar 2022.

Sources

Also known as GHSA-v7xg-xv38-f34w.