{"id":"CVE-2001-0851","aliases":["EUVD-2001-0834","GHSA-gfc3-m7qc-fc7m"],"status":"published","title":"Linux kernel 2.0, 2.2 and 2.4 with syncookies enabled allows remote attackers to bypass firewall...","description":"Linux kernel 2.0, 2.2 and 2.4 with syncookies enabled allows remote attackers to bypass firewall rules by brute force guessing the cookie.","severity":{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:P/I:N/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.03004,"percentile":0.87472,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2001-12-06T05:00:00Z","modified":"2026-06-16T21:55:05Z","products":[{"vendor":"caldera","product":"openlinux"},{"vendor":"caldera","product":"openlinux_edesktop"},{"vendor":"caldera","product":"openlinux_eserver"},{"vendor":"caldera","product":"openlinux_server"},{"vendor":"caldera","product":"openlinux_workstation"},{"vendor":"linux","product":"linux_kernel"},{"vendor":"suse","product":"suse_linux"}],"references":[{"url":"http://www.linux-mandrake.com/en/security/2001/MDKSA-2001-082.php3","tags":["vendor-advisory","x_refsource_MANDRAKE","x_transferred"]},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/7461","tags":["vdb-entry","x_refsource_XF","x_transferred"]},{"url":"http://www.novell.com/linux/security/advisories/2001_039_kernel2_txt.html","tags":["vendor-advisory","x_refsource_SUSE","x_transferred"]},{"url":"http://www.redhat.com/support/errata/RHSA-2001-142.html","tags":["vendor-advisory","x_refsource_REDHAT","x_transferred"]},{"url":"http://www.linuxsecurity.com/advisories/other_advisory-1683.html","tags":["vendor-advisory","x_refsource_ENGARDE","x_transferred","Patch","Vendor Advisory"]},{"url":"http://www.caldera.com/support/security/advisories/CSSA-2001-038.0.txt","tags":["vendor-advisory","x_refsource_CALDERA","x_transferred","Patch","Vendor Advisory"]},{"url":"http://distro.conectiva.com.br/atualizacoes/?id=a\u0026anuncio=000432","tags":["vendor-advisory","x_refsource_CONECTIVA","x_transferred"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2001-0851"},{"url":"https://github.com/advisories/GHSA-gfc3-m7qc-fc7m"}],"sources":{"cve":[{"id":"CVE-2001-0851","description":"Linux kernel 2.0, 2.2 and 2.4 with syncookies enabled allows remote attackers to bypass firewall rules by brute force guessing the cookie.","status":"published","published":"2002-03-09T05:00:00Z","modified":"2024-08-08T04:37:06.4Z","updated_at":"2026-11-02T14:34:43.032065Z"}],"euvd":[{"id":"EUVD-2001-0834","description":"Linux kernel 2.0, 2.2 and 2.4 with syncookies enabled allows remote attackers to bypass firewall rules by brute force guessing the cookie.","status":"published","published":"2002-03-09T05:00:00Z","modified":"2024-08-08T04:37:06Z","updated_at":"2026-11-03T01:14:50.111938Z"}],"ghsa":[{"id":"GHSA-gfc3-m7qc-fc7m","title":"Linux kernel 2.0, 2.2 and 2.4 with syncookies enabled allows remote attackers to bypass firewall...","description":"Linux kernel 2.0, 2.2 and 2.4 with syncookies enabled allows remote attackers to bypass firewall rules by brute force guessing the cookie.","status":"published","published":"2022-04-30T18:16:50Z","modified":"2023-01-30T05:05:41Z","updated_at":"2026-11-02T14:47:20.238022Z"}],"nvd":[{"id":"CVE-2001-0851","description":"Linux kernel 2.0, 2.2 and 2.4 with syncookies enabled allows remote attackers to bypass firewall rules by brute force guessing the cookie.","status":"published","published":"2001-12-06T05:00:00Z","modified":"2026-06-16T21:55:05.903Z","cvss":[{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:P/I:N/A:N","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:00:41.313877Z"}]}}