Vulnerability Note VU#555220

Citrix Access Gateway appliances vulnerable to information disclosure

Original Release date: 29 Jan 2007 | Last revised: 29 Jan 2007


A vulnerability exists in Citrix Access Gateway appliances that may allow an attacker to access data and compromise the system.


Citrix Access Gateway products are universal SSL VPN appliances providing a secure, always-on, single point-of-access to an organization's applications and data. Some versions can be configured to have administrative and access control policy functions centralized in configurations using Advanced Access Control with an Access Gateway appliance. According to Citrix:

When using Advanced Access Control with an Access Gateway appliance, unauthenticated remote users may be able to gain access to data on the Access Gateway appliance. The information disclosed could potentially lead to a compromise of the appliance.

This vulnerability affects the following products:
• Access Gateway 4.5 Advanced Edition
• Access Gateway 4.2 with Advanced Access Control 4.2 (currently known as Access Gateway 4.2 Advanced Edition)
When deployed with:
• Access Gateway appliance 4.2
• Access Gateway appliance 4.2.1
• Access Gateway appliance 4.2.2
Access Gateway appliances deployed without Advanced Access Control are not vulnerable to this issue.


A remote, unauthenticated attacker may be able to gain access to sensitive data from an affected device. This information disclosure could supplement additional attacks and potentially lead to a compromise of the affected device.


Apply an Update

Citrix has released product updates that address this issue. Please see Citrix document CTX111695 for further information.

Systems Affected (Learn More)

VendorStatusDate NotifiedDate Updated
CitrixAffected-24 Jan 2007
If you are a vendor and your product is affected, let us know.

CVSS Metrics (Learn More)

Group Score Vector
Base N/A N/A
Temporal N/A N/A
Environmental N/A N/A



This issue was reported in Citrix document CTX111695 . Citrix thanks Thierry Zoller and Laurent Kempenaar for reporting the issue.

This document was written by Katie Steiner.

Other Information

  • CVE IDs: CVE-2006-6573
  • Date Public: 15 Nov 2006
  • Date First Published: 29 Jan 2007
  • Date Last Updated: 29 Jan 2007
  • Document Revision: 7


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