How severe is CVE-2011-2882?

CVE-2011-2882 has a CVSS 2.0 base score of 9.3, rated critical severity.

Is CVE-2011-2882 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 56% (99th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-2882?

CVE-2011-2882 primarily affects Citrix Access Gateway. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-2882?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2011-2882 published?

CVE-2011-2882 was published on 2011-07-21 and last updated on 2026-06-16.

CVE-2011-2882

CVE-2011-2882 is a critical-severity vulnerability in Citrix Access Gateway with a CVSS 2.0 base score of 9.3. Its EPSS exploit-prediction score of 56% places it in the 99th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-119.

Key facts

Severity: Critical (CVSS 2.0 base score 9.3)
EPSS exploit prediction: 56% (99th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Citrix Access Gateway
Published: 2011-07-21
Last modified: 2026-06-16

Description

Stack-based buffer overflow in 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 allows remote attackers to execute arbitrary code via crafted HTTP header data.

Frequently asked questions

What is CVE-2011-2882?: Stack-based buffer overflow in 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 allows remote attackers to execute arbitrary code via crafted HTTP header data.
How severe is CVE-2011-2882?: CVE-2011-2882 has a CVSS 2.0 base score of 9.3, rated critical severity.
Is CVE-2011-2882 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 56% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-2882?: CVE-2011-2882 primarily affects Citrix Access Gateway. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-2882?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2011-2882 published?: CVE-2011-2882 was published on 2011-07-21 and last updated on 2026-06-16.

References

Affected products (3)

cpe:2.3:a:citrix:access_gateway:8.1:*:enterprise:*:*:*:*:*
cpe:2.3:a:citrix:access_gateway:9.0:*:enterprise:*:*:*:*:*
cpe:2.3:a:citrix:access_gateway:9.1:*:enterprise:*:*:*:*:*

More vulnerabilities in Citrix Access Gateway

CVE-2008-2528 — Critical (CVSS 10.0): Unspecified vulnerability in Citrix Access Gateway Standard Edition 4.5.7 and earlier and Advanced Edition 4.5 HF2 and…
CVE-2011-2883 — Critical (CVSS 9.3): The NSEPA.NsepaCtrl.1 ActiveX control in nsepa.ocx in Citrix Access Gateway Enterprise Edition 8.1 before 8.1-67.7, 9.0…
CVE-2010-4566 — Critical (CVSS 9.3): The web authentication form in the NT4 authentication component in Citrix Access Gateway Enterprise Edition 9.2-49.8…
CVE-2007-4013 — Critical (CVSS 9.3): Multiple unspecified vulnerabilities in (1) Net6Helper.DLL (aka Net6Launcher Class) 4.5.2 and earlier, (2) npCtxCAO.dll…
CVE-2007-4017 — High (CVSS 7.6): Cross-site request forgery (CSRF) vulnerability in the web-based administration console in Citrix Access Gateway before…
CVE-2007-4016 — Medium (CVSS 6.8): Unspecified vulnerability in the client components in Citrix Access Gateway Standard Edition before 4.5.5 and Advanced…

All CVEs affecting Citrix Access Gateway →

Other CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) vulnerabilities

CVE-2026-2778 — Critical (CVSS 10.0): Sandbox escape due to incorrect boundary conditions in the DOM: Core & HTML component. This vulnerability was fixed in…
CVE-2026-2776 — Critical (CVSS 10.0): Sandbox escape due to incorrect boundary conditions in the Telemetry component in External Software. This vulnerability…
CVE-2025-1866 — Critical (CVSS 10.0): Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in warmcat libwebsockets allows…
CVE-2022-27625 — Critical (CVSS 10.0): A vulnerability regarding improper restriction of operations within the bounds of a memory buffer is found in the…
CVE-2022-27624 — Critical (CVSS 10.0): A vulnerability regarding improper restriction of operations within the bounds of a memory buffer is found in the…
CVE-2020-11896 — Critical (CVSS 10.0): The Treck TCP/IP stack before 6.0.1.66 allows Remote Code Execution, related to IPv4 tunneling.

Browse all CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) vulnerabilities →