{"id":"CVE-1999-1577","aliases":["EUVD-1999-1558","GHSA-hc2h-vv8g-pjcj"],"status":"published","title":"Buffer overflow in HHOpen ActiveX control (hhopen.ocx) 1.0.0.1 for Internet Explorer 4.01 and 5...","description":"Buffer overflow in HHOpen ActiveX control (hhopen.ocx) 1.0.0.1 for Internet Explorer 4.01 and 5 allows remote attackers to execute arbitrary commands via long arguments to the OpenHelp method.","severity":{"version":"2.0","score":5.1,"vector":"AV:N/AC:H/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.19487,"percentile":0.97391,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":false},"published":"1999-10-31T04:00:00Z","modified":"2026-06-16T21:50:45Z","exploits":[{"source":"exploitdb","id":"EDB-19521","title":"Microsoft Internet Explorer 5.0/4.0.1 - hhopen OLE Control Buffer Overflow","type":"remote","platform":"windows","date":"1999-09-27","verified":true,"url":"https://www.exploit-db.com/exploits/19521"}],"products":[{"vendor":"microsoft","product":"internet_explorer"}],"references":[{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/3314","tags":["vdb-entry","x_refsource_XF","x_transferred"]},{"url":"http://www.kb.cert.org/vuls/id/29795","tags":["third-party-advisory","x_refsource_CERT-VN","x_transferred","US Government Resource"]},{"url":"http://www.securityfocus.com/bid/669","tags":["vdb-entry","x_refsource_BID","x_transferred"]},{"url":"http://www.securityfocus.com/archive/1/28719","tags":["mailing-list","x_refsource_BUGTRAQ","x_transferred"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-1999-1577"},{"url":"https://github.com/advisories/GHSA-hc2h-vv8g-pjcj"}],"sources":{"cve":[{"id":"CVE-1999-1577","description":"Buffer overflow in HHOpen ActiveX control (hhopen.ocx) 1.0.0.1 for Internet Explorer 4.01 and 5 allows remote attackers to execute arbitrary commands via long arguments to the OpenHelp method.","status":"published","published":"2005-04-21T04:00:00Z","modified":"2024-08-01T17:18:07.666Z","updated_at":"2026-11-02T14:33:53.60785Z"}],"euvd":[{"id":"EUVD-1999-1558","description":"Buffer overflow in HHOpen ActiveX control (hhopen.ocx) 1.0.0.1 for Internet Explorer 4.01 and 5 allows remote attackers to execute arbitrary commands via long arguments to the OpenHelp method.","status":"published","published":"2005-04-21T04:00:00Z","modified":"2024-08-01T17:18:07Z","updated_at":"2026-11-03T03:50:41.965248Z"}],"ghsa":[{"id":"GHSA-hc2h-vv8g-pjcj","title":"Buffer overflow in HHOpen ActiveX control (hhopen.ocx) 1.0.0.1 for Internet Explorer 4.01 and 5...","description":"Buffer overflow in HHOpen ActiveX control (hhopen.ocx) 1.0.0.1 for Internet Explorer 4.01 and 5 allows remote attackers to execute arbitrary commands via long arguments to the OpenHelp method.","status":"published","published":"2022-04-30T18:12:44Z","modified":"2023-01-30T05:04:23Z","updated_at":"2026-11-02T14:47:02.242952Z"}],"nvd":[{"id":"CVE-1999-1577","description":"Buffer overflow in HHOpen ActiveX control (hhopen.ocx) 1.0.0.1 for Internet Explorer 4.01 and 5 allows remote attackers to execute arbitrary commands via long arguments to the OpenHelp method.","status":"published","published":"1999-10-31T04:00:00Z","modified":"2026-06-16T21:50:45.543Z","cvss":[{"version":"2.0","score":5.1,"vector":"AV:N/AC:H/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T13:58:40.923898Z"}]}}