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CVE-2011-2883

9.3 · HIGH

The NSEPA.NsepaCtrl.1 ActiveX control in nsepa.ocx in Citrix Access Gateway Enterprise Edition 8.1 before 8.1-67.7, 9.0 before 9.0-70.5, and 9.1 before 9.1-96.4 attempts to validate signed DLLs by…

Published Jul 21, 2011citrixCWE-20EPSS 1.53%

Overview

CVE-2011-2883 is a high-severity vulnerability affecting citrix access_gateway. It was published on July 21, 2011 and has a CVSS 2.0 base score of 9.3 (HIGH).

This vulnerability has a CVSS 2.0 base score of 9.3, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

The NSEPA.NsepaCtrl.1 ActiveX control in nsepa.ocx in Citrix Access Gateway Enterprise Edition 8.1 before 8.1-67.7, 9.0 before 9.0-70.5, and 9.1 before 9.1-96.4 attempts to validate signed DLLs by checking the certificate subject, not the signature, which allows man-in-the-middle attackers to execute arbitrary code via HTTP header data referencing a DLL that was signed with a crafted certificate.

Remediation

Check the references section for vendor advisories and patches from citrix. Update access_gateway to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus

References

Reflabs.idefense.com/intelligence/vulnerabilities/display.php?id=928Reflabs.idefense.com/intelligence/vulnerabilities/display.php?id=928

How CyberStrike helps

Frequently asked questions

What is CVE-2011-2883?

CVE-2011-2883 is a high-severity vulnerability affecting citrix access_gateway. It was published on July 21, 2011 and has a CVSS 2.0 base score of 9.3 (HIGH).

How severe is CVE-2011-2883?

This vulnerability has a CVSS 2.0 base score of 9.3, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2011-2883?

Check the references section for vendor advisories and patches from citrix. Update access_gateway to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2011-2883?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2011-2883 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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