{"id":"CVE-2001-0288","aliases":["EUVD-2001-0288","GHSA-85gx-fwrr-6mpx"],"status":"published","title":"Cisco switches and routers running IOS 12.1 and earlier produce predictable TCP Initial Sequence...","description":"Cisco switches and routers running IOS 12.1 and earlier produce predictable TCP Initial Sequence Numbers (ISNs), which allows remote attackers to spoof or hijack TCP connections.","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":"2026-11-08","score":0.05407,"percentile":0.92741,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":false},"published":"2001-05-03T04:00:00Z","modified":"2026-06-16T21:54:02Z","exploits":[{"source":"exploitdb","id":"EDB-19522","title":"Linux Kernel 2.2 - Predictable TCP Initial Sequence Number","type":"remote","platform":"linux","date":"1999-09-27","verified":true,"url":"https://www.exploit-db.com/exploits/19522"}],"products":[{"vendor":"cisco","product":"ios"}],"references":[{"url":"http://www.cisco.com/warp/public/707/ios-tcp-isn-random-pub.shtml","tags":["vendor-advisory","x_refsource_CISCO","x_transferred","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2001-0288"},{"url":"https://github.com/advisories/GHSA-85gx-fwrr-6mpx"}],"sources":{"cve":[{"id":"CVE-2001-0288","description":"Cisco switches and routers running IOS 12.1 and earlier produce predictable TCP Initial Sequence Numbers (ISNs), which allows remote attackers to spoof or hijack TCP connections.","status":"published","published":"2001-05-07T04:00:00Z","modified":"2024-08-08T04:14:07.372Z","updated_at":"2026-11-02T14:34:43.358691Z"}],"euvd":[{"id":"EUVD-2001-0288","description":"Cisco switches and routers running IOS 12.1 and earlier produce predictable TCP Initial Sequence Numbers (ISNs), which allows remote attackers to spoof or hijack TCP connections.","status":"published","published":"2001-05-07T04:00:00Z","modified":"2024-08-08T04:14:07Z","updated_at":"2026-11-03T01:14:52.491684Z"}],"ghsa":[{"id":"GHSA-85gx-fwrr-6mpx","title":"Cisco switches and routers running IOS 12.1 and earlier produce predictable TCP Initial Sequence...","description":"Cisco switches and routers running IOS 12.1 and earlier produce predictable TCP Initial Sequence Numbers (ISNs), which allows remote attackers to spoof or hijack TCP connections.","status":"published","published":"2022-04-30T18:15:48Z","modified":"2023-01-30T05:05:12Z","updated_at":"2026-11-02T14:47:12.945495Z"}],"nvd":[{"id":"CVE-2001-0288","description":"Cisco switches and routers running IOS 12.1 and earlier produce predictable TCP Initial Sequence Numbers (ISNs), which allows remote attackers to spoof or hijack TCP connections.","status":"published","published":"2001-05-03T04:00:00Z","modified":"2026-06-16T21:54:02.057Z","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":"2026-11-02T14:00:40.041412Z"}]}}