TI-2011-02536 Aliases CVE-2011-2883 GHSA-h237-vcw4-4cvv

The NSEPA.NsepaCtrl.1 ActiveX control in nsepa.ocx in Citrix Access Gateway Enterprise…

MEDIUM 43CWE-20Published 2011-07-21 · Updated 2024-09-17

Key facts

Attack vector: Network
Privileges required: None
User interaction: — Not recorded in CVSS 2.0
Attack complexity: Medium
Impact type: —
Confidentiality · integrity · availability: Complete · Complete · Complete
Fix status: No fix listed

Attack profile from CVSS 2.0 · NVD. Fix status from CNA.

Summary

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.

Why it matters now

EPSS 0.01529 74th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 3

CPE	Versions	Role	Vendor
cpe:2.3:a:citrix:access_gateway:8.1::enterprise:::::	8.1	Vulnerable	Citrix
cpe:2.3:a:citrix:access_gateway:9.0::enterprise:::::	9.0	Vulnerable	Citrix
cpe:2.3:a:citrix:access_gateway:9.1::enterprise:::::	9.1	Vulnerable	Citrix

cpe:2.3:a:citrix:access_gateway:8.1:*:enterprise:*:*:*:*:* Versions 8.1 Vulnerable ·Citrix
cpe:2.3:a:citrix:access_gateway:9.0:*:enterprise:*:*:*:*:* Versions 9.0 Vulnerable ·Citrix
cpe:2.3:a:citrix:access_gateway:9.1:*:enterprise:*:*:*:*:* Versions 9.1 Vulnerable ·Citrix

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2011-2883
2026-10-03 Alias added: GHSA-h237-vcw4-4cvv

References

Advisory 1

20110714 Citrix Access Gateway ActiveX Arbitrary Libary Loading Vulnerability

TI-2011-02535 Stack-based buffer overflow in the NSEPA.NsepaCtrl.1 ActiveX control in nsepa.ocx in… CVSS 2.0HIGH 9.3
TI-2010-04292 The web authentication form in the NT4 authentication component in Citrix Access Gateway… CVSS 2.0HIGH 9.3
TI-2008-02420 Unspecified vulnerability in Citrix Access Gateway Standard Edition 4.5.7 and earlier and… CVSS 2.0HIGH 10.0
TI-2007-03886 Multiple unspecified vulnerabilities in (1) Net6Helper.DLL (aka Net6Launcher Class) 4.5.2… CVSS 2.0HIGH 9.3
TI-2007-03889 Cross-site request forgery (CSRF) vulnerability in the web-based administration console… CVSS 2.0HIGH 7.6
TI-2007-03888 Unspecified vulnerability in the client components in Citrix Access Gateway Standard… CVSS 2.0MEDIUM 6.8

See all 13 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences