{"id":"CVE-2011-2883","aliases":["EUVD-2011-2857","GHSA-h237-vcw4-4cvv"],"status":"published","title":"The NSEPA.NsepaCtrl.1 ActiveX control in nsepa.ocx in Citrix Access Gateway Enterprise Edition 8...","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.","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":0.01529,"percentile":0.74895,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-20"],"published":"2011-07-21T23:00:00Z","modified":"2026-06-16T23:32:10Z","products":[{"vendor":"citrix","product":"access_gateway"}],"references":[{"url":"http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=928","tags":["third-party-advisory","x_refsource_IDEFENSE","x_transferred"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2011-2883"},{"url":"https://github.com/advisories/GHSA-h237-vcw4-4cvv"}],"sources":{"cve":[{"id":"CVE-2011-2883","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.","status":"published","published":"2011-07-21T23:00:00Z","modified":"2024-09-17T01:42:00.092Z","updated_at":"2026-11-02T14:35:36.603688Z"}],"euvd":[{"id":"EUVD-2011-2857","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.","status":"published","published":"2011-07-21T23:00:00Z","modified":"2024-09-17T01:42:00Z","updated_at":"2026-11-03T00:28:47.09844Z"}],"ghsa":[{"id":"GHSA-h237-vcw4-4cvv","title":"The NSEPA.NsepaCtrl.1 ActiveX control in nsepa.ocx in Citrix Access Gateway Enterprise Edition 8...","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.","status":"published","published":"2022-05-17T05:40:14Z","modified":"2023-01-28T05:04:30Z","cwes":["CWE-20"],"updated_at":"2026-11-02T14:44:11.36375Z"}],"nvd":[{"id":"CVE-2011-2883","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.","status":"published","published":"2011-07-21T23:55:04.317Z","modified":"2026-06-16T23:32:10.67Z","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-20"],"updated_at":"2026-11-02T14:02:09.182398Z"}]}}