What is CVE-2011-2882?

CVE-2011-2882 is a vulnerability in Citrix Access Gateway, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. Published 2011-07-21.

Is CVE-2011-2882 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Citrix Access Gateway

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.

Vulnerability class: Buffer Overflow

Published 2011-07-21 · last modified 2026-06-16.

CVSS v2 metric

CVSS v2 base score 9.3 (High). Vector: AV:N/AC:M/Au:N/C:C/I:C/A:C. This CVE predates CVSS v3 and has no v3 score from NVD.

EPSS exploit prediction

EPSS: 0.564 (99.0th percentile), scored 2026-10-18.

High probability of exploitation in the next 30 days — patch promptly. 99th percentile — 99.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.564 · newest: 0.564 · change: 0.000

Affected products

Citrix Access Gateway — versions 8.1, 9.0, 9.1

Weakness classification (CWE)

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer

Public proof-of-concept exploits

rapid7/metasploit-framework

References

securityreason.com/securityalert/8358 (third-party-advisory)
labs.idefense.com/intelligence/vulnerabilities/display.php (third-party-advisory)

Frequently asked questions

What is CVE-2011-2882?: CVE-2011-2882 is a vulnerability in Citrix Access Gateway, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. Published 2011-07-21.
Is CVE-2011-2882 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.