{"id":"CVE-1999-1150","aliases":["EUVD-1999-1131","GHSA-vxxg-9388-x757"],"status":"published","title":"Livingston Portmaster routers running ComOS use the same initial sequence number (ISN) for TCP...","description":"Livingston Portmaster routers running ComOS use the same initial sequence number (ISN) for TCP connections, which allows remote attackers to conduct spoofing and hijack TCP sessions.","severity":{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.01351,"percentile":0.71728,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"1998-06-30T04:00:00Z","modified":"2026-06-16T21:49:49Z","products":[{"vendor":"livingston_portmaster","product":"portmaster"}],"references":[{"url":"http://www.securityfocus.com/archive/1/9723","tags":["mailing-list","x_refsource_BUGTRAQ","x_transferred","Vendor Advisory"]},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/1882","tags":["vdb-entry","x_refsource_XF","x_transferred"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-1999-1150"},{"url":"https://github.com/advisories/GHSA-vxxg-9388-x757"}],"sources":{"cve":[{"id":"CVE-1999-1150","description":"Livingston Portmaster routers running ComOS use the same initial sequence number (ISN) for TCP connections, which allows remote attackers to conduct spoofing and hijack TCP sessions.","status":"published","published":"2001-09-12T04:00:00Z","modified":"2024-08-01T17:02:53.746Z","updated_at":"2026-11-02T14:33:53.295018Z"}],"euvd":[{"id":"EUVD-1999-1131","description":"Livingston Portmaster routers running ComOS use the same initial sequence number (ISN) for TCP connections, which allows remote attackers to conduct spoofing and hijack TCP sessions.","status":"published","published":"2001-09-12T04:00:00Z","modified":"2024-08-01T17:02:53Z","updated_at":"2026-11-03T03:50:43.777799Z"}],"ghsa":[{"id":"GHSA-vxxg-9388-x757","title":"Livingston Portmaster routers running ComOS use the same initial sequence number (ISN) for TCP...","description":"Livingston Portmaster routers running ComOS use the same initial sequence number (ISN) for TCP connections, which allows remote attackers to conduct spoofing and hijack TCP sessions.","status":"published","published":"2022-04-30T18:11:54Z","modified":"2023-01-30T05:04:17Z","updated_at":"2026-11-02T14:47:00.827412Z"}],"nvd":[{"id":"CVE-1999-1150","description":"Livingston Portmaster routers running ComOS use the same initial sequence number (ISN) for TCP connections, which allows remote attackers to conduct spoofing and hijack TCP sessions.","status":"published","published":"1998-06-30T04:00:00Z","modified":"2026-06-16T21:49:49.663Z","cvss":[{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"updated_at":"2026-11-02T13:58:30.236077Z"}]}}