CVE-2011-1889

Name: CVE-2011-1889
Creator: NVD / NIST
Published: 2011-06-16T20:55:02.543+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10Actively ExploitedEPSS 48.37%

Last modified Jun 16, 2026

CVE-2011-1889 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.". CISA has confirmed active exploitation in the wild. EPSS estimates a 48.37% chance of exploitation in the next 30 days.

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."

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

48.37%

98.7th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Mar 24, 2022.

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Microsoft	Forefront Threat Management Gateway	2010

References

http://secunia.com/advisories/44857Broken Link
http://www.securityfocus.com/bid/48181Broken Link, Third Party Advisory, VDB Entry
http://www.securitytracker.com/id?1025637Broken Link, Third Party Advisory, VDB Entry
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-040Patch, Vendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/67736Third Party Advisory, VDB Entry
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12642Broken Link
http://secunia.com/advisories/44857Broken Link
http://www.securityfocus.com/bid/48181Broken Link, Third Party Advisory, VDB Entry
http://www.securitytracker.com/id?1025637Broken Link, Third Party Advisory, VDB Entry
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-040Patch, Vendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/67736Third Party Advisory, VDB Entry
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12642Broken Link
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2011-1889US Government Resource

Timeline

Published: Jun 16, 2011
Last Modified: Jun 16, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2011-1889?

How severe is CVE-2011-1889?

CVE-2011-1889 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 48.37% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2011-1889?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST