{"id":"CVE-2011-2882","aliases":["EUVD-2011-2856","GHSA-cwj2-353m-w5fv"],"status":"published","title":"Stack-based buffer overflow in the NSEPA.NsepaCtrl.1 ActiveX control in nsepa.ocx in Citrix...","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.","severity":{"version":"2.0","score":9.3,"vector":"AV:N/AC:M/Au:N/C:C/I:C/A:C","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.56368,"percentile":0.9906,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":false},"cwes":["CWE-119"],"published":"2011-07-21T23:00:00Z","modified":"2026-06-16T23:32:10Z","exploits":[{"source":"exploitdb","id":"EDB-17762","title":"Citrix Gateway - ActiveX Control Stack Buffer Overflow (Metasploit)","type":"remote","platform":"windows","date":"2011-08-31","verified":true,"url":"https://www.exploit-db.com/exploits/17762"},{"source":"metasploit","id":"exploit/windows/browser/citrix_gateway_actx","title":"Citrix Gateway ActiveX Control Stack Based Buffer Overflow Vulnerability","type":"exploit","platform":"Windows","date":"2011-07-14","verified":true,"url":"https://www.rapid7.com/db/modules/exploit/windows/browser/citrix_gateway_actx"}],"products":[{"vendor":"citrix","product":"access_gateway"}],"references":[{"url":"http://securityreason.com/securityalert/8358","tags":["third-party-advisory","x_refsource_SREASON","x_transferred"]},{"url":"http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=929","tags":["third-party-advisory","x_refsource_IDEFENSE","x_transferred"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2011-2882"},{"url":"https://github.com/advisories/GHSA-cwj2-353m-w5fv"}],"sources":{"cve":[{"id":"CVE-2011-2882","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.","status":"published","published":"2011-07-21T23:00:00Z","modified":"2024-08-06T23:15:31.527Z","updated_at":"2026-11-02T14:35:36.603688Z"}],"euvd":[{"id":"EUVD-2011-2856","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.","status":"published","published":"2011-07-21T23:00:00Z","modified":"2024-08-06T23:15:31Z","updated_at":"2026-11-03T01:39:54.084102Z"}],"ghsa":[{"id":"GHSA-cwj2-353m-w5fv","title":"Stack-based buffer overflow in the NSEPA.NsepaCtrl.1 ActiveX control in nsepa.ocx in Citrix...","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.","status":"published","published":"2022-05-17T05:38:52Z","modified":"2023-01-28T05:04:10Z","cwes":["CWE-119"],"updated_at":"2026-11-02T14:44:07.246935Z"}],"nvd":[{"id":"CVE-2011-2882","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.","status":"published","published":"2011-07-21T23:55:04.27Z","modified":"2026-06-16T23:32:10.563Z","cvss":[{"version":"2.0","score":9.3,"vector":"AV:N/AC:M/Au:N/C:C/I:C/A:C","level":"high","assessor":"primary"}],"cwes":["CWE-119"],"updated_at":"2026-11-02T14:02:09.182398Z"}]}}