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Exploited vulnerability · CISA KEV

Is CVE-2011-1889 exploited? Yes: in CISA KEV since 3 Mar 2022

Gociux · Microsoft Forefront Threat Management Gateway (TMG) · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2011-1889, Microsoft Forefront TMG Remote Code Execution Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 3 Mar 2022, 3913 days after it was published. It affects Microsoft Forefront Threat Management Gateway (TMG). If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 3 Mar 2022
ransomwareNot knownno confirmed use
EPSStop 5%very likely to be exploited
severity9.8CVSS 3.1 · critical
US federal due24 Mar 2022BOD 22-01 deadline

What it is

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.

VendorMicrosoft (391 exploited CVEs in KEV)
ProductForefront Threat Management Gateway (TMG)
VulnerabilityMicrosoft Forefront TMG Remote Code Execution Vulnerability
WeaknessCWE-119
Published16 Jun 2011
Added to KEV3 Mar 2022
Reported by (CNA)microsoft

What to do

  1. Check whether you run it. Look for Forefront Threat Management Gateway (TMG) in your asset inventory, including appliances and cloud images. Stack check lists every exploited Microsoft CVE at once.
  2. Apply the fix. Apply updates per vendor instructions.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 16 Jun 2011.
  4. Get told next time. Email alerts when CISA adds a CVE for Microsoft.

References

Questions

Is CVE-2011-1889 being exploited?

Yes. CISA added CVE-2011-1889 to the Known Exploited Vulnerabilities catalog on 3 Mar 2022, which means there is reliable evidence of exploitation in the wild.

Is CVE-2011-1889 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2011-1889?

Apply updates per vendor instructions. Check Microsoft's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Forefront Threat Management Gateway (TMG) and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in March 2022 · Microsoft scorecard · act-now radar.

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