{"id":"CVE-2001-1244","aliases":["EUVD-2001-1225","GHSA-g5fj-94hx-c37v"],"status":"published","title":"Multiple TCP implementations could allow remote attackers to cause a denial of service (bandwidth...","description":"Multiple TCP implementations could allow remote attackers to cause a denial of service (bandwidth and CPU exhaustion) by setting the maximum segment size (MSS) to a very small number and requesting large amounts of data, which generates more packets with less TCP-level data that amplify network traffic and consume more server CPU to process.","severity":{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-07","score":0.21965,"percentile":0.97672,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":false},"published":"2001-07-07T04:00:00Z","modified":"2026-06-16T21:55:53Z","exploits":[{"source":"exploitdb","id":"EDB-20997","title":"HP-UX 11 / Linux Kernel 2.4 / Windows 2000/NT 4.0 / IRIX 6.5 - Small TCP MSS Denial of Service","type":"dos","platform":"multiple","date":"2001-07-07","verified":true,"url":"https://www.exploit-db.com/exploits/20997"}],"products":[{"vendor":"freebsd","product":"freebsd"},{"vendor":"hp","product":"hp-ux"},{"vendor":"hp","product":"vvos"},{"vendor":"linux","product":"linux_kernel"},{"vendor":"microsoft","product":"windows_2000"},{"vendor":"microsoft","product":"windows_nt"},{"vendor":"netbsd","product":"netbsd"},{"vendor":"openbsd","product":"openbsd"},{"vendor":"sun","product":"sunos"}],"references":[{"url":"http://www.securityfocus.com/archive/1/195457","tags":["mailing-list","x_refsource_BUGTRAQ","x_transferred"]},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/6824","tags":["vdb-entry","x_refsource_XF","x_transferred"]},{"url":"http://www.securityfocus.com/bid/2997","tags":["vdb-entry","x_refsource_BID","x_transferred","Exploit","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2001-1244"},{"url":"https://github.com/advisories/GHSA-g5fj-94hx-c37v"}],"sources":{"cve":[{"id":"CVE-2001-1244","description":"Multiple TCP implementations could allow remote attackers to cause a denial of service (bandwidth and CPU exhaustion) by setting the maximum segment size (MSS) to a very small number and requesting large amounts of data, which generates more packets with less TCP-level data that amplify network traffic and consume more server CPU to process.","status":"published","published":"2002-05-03T04:00:00Z","modified":"2024-08-08T04:51:07.75Z","updated_at":"2026-11-02T14:34:42.680977Z"}],"euvd":[{"id":"EUVD-2001-1225","description":"Multiple TCP implementations could allow remote attackers to cause a denial of service (bandwidth and CPU exhaustion) by setting the maximum segment size (MSS) to a very small number and requesting large amounts of data, which generates more packets with less TCP-level data that amplify network traffic and consume more server CPU to process.","status":"published","published":"2002-05-03T04:00:00Z","modified":"2024-08-08T04:51:07Z","updated_at":"2026-11-03T01:14:48.04102Z"}],"ghsa":[{"id":"GHSA-g5fj-94hx-c37v","title":"Multiple TCP implementations could allow remote attackers to cause a denial of service (bandwidth...","description":"Multiple TCP implementations could allow remote attackers to cause a denial of service (bandwidth and CPU exhaustion) by setting the maximum segment size (MSS) to a very small number and requesting large amounts of data, which generates more packets with less TCP-level data that amplify network traffic and consume more server CPU to process.","status":"published","published":"2022-04-30T18:17:37Z","modified":"2023-01-30T05:05:13Z","updated_at":"2026-11-02T14:47:13.441339Z"}],"nvd":[{"id":"CVE-2001-1244","description":"Multiple TCP implementations could allow remote attackers to cause a denial of service (bandwidth and CPU exhaustion) by setting the maximum segment size (MSS) to a very small number and requesting large amounts of data, which generates more packets with less TCP-level data that amplify network traffic and consume more server CPU to process.","status":"published","published":"2001-07-07T04:00:00Z","modified":"2026-06-16T21:55:53.067Z","cvss":[{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:00:40.041412Z"}]}}