{"id":"CVE-2001-1559","aliases":["EUVD-2001-1536","GHSA-c4g9-53v4-f2qg"],"status":"published","title":"The uipc system calls (uipc_syscalls.c) in OpenBSD 2.9 and 3.0 provide user mode return instead...","description":"The uipc system calls (uipc_syscalls.c) in OpenBSD 2.9 and 3.0 provide user mode return instead of versus rval kernel mode values to the fdrelease function, which allows local users to cause a denial of service and trigger a null dereference.","severity":{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.01482,"percentile":0.74132,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":false},"cwes":["CWE-476"],"published":"2001-12-31T05:00:00Z","modified":"2026-06-16T21:56:30Z","exploits":[{"source":"exploitdb","id":"EDB-21167","title":"OpenBSD 2.x/3.0 - User Mode Return Value Denial of Service","type":"dos","platform":"openbsd","date":"2001-12-03","verified":true,"url":"https://www.exploit-db.com/exploits/21167"}],"products":[{"vendor":"openbsd","product":"openbsd"}],"references":[{"url":"http://www.iss.net/security_center/static/7690.php","tags":["vdb-entry","x_refsource_XF","x_transferred","Broken Link"]},{"url":"http://archives.neohapsis.com/archives/bugtraq/2001-12/0014.html","tags":["mailing-list","x_refsource_BUGTRAQ","x_transferred","Broken Link","Exploit"]},{"url":"http://monkey.org/openbsd/archive/tech/0112/msg00015.html","tags":["mailing-list","x_refsource_MLIST","x_transferred","Broken Link","Exploit"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2001-1559"},{"url":"https://github.com/advisories/GHSA-c4g9-53v4-f2qg"}],"sources":{"cve":[{"id":"CVE-2001-1559","description":"The uipc system calls (uipc_syscalls.c) in OpenBSD 2.9 and 3.0 provide user mode return instead of versus rval kernel mode values to the fdrelease function, which allows local users to cause a denial of service and trigger a null dereference.","status":"published","published":"2005-07-14T04:00:00Z","modified":"2024-09-16T16:28:46.455Z","updated_at":"2026-11-02T14:34:42.680977Z"}],"euvd":[{"id":"EUVD-2001-1536","description":"The uipc system calls (uipc_syscalls.c) in OpenBSD 2.9 and 3.0 provide user mode return instead of versus rval kernel mode values to the fdrelease function, which allows local users to cause a denial of service and trigger a null dereference.","status":"published","published":"2005-07-14T04:00:00Z","modified":"2024-09-16T16:28:46Z","updated_at":"2026-11-03T00:55:51.136895Z"}],"ghsa":[{"id":"GHSA-c4g9-53v4-f2qg","title":"The uipc system calls (uipc_syscalls.c) in OpenBSD 2.9 and 3.0 provide user mode return instead...","description":"The uipc system calls (uipc_syscalls.c) in OpenBSD 2.9 and 3.0 provide user mode return instead of versus rval kernel mode values to the fdrelease function, which allows local users to cause a denial of service and trigger a null dereference.","status":"published","published":"2022-04-30T18:18:16Z","modified":"2026-03-25T05:03:47Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-476"],"updated_at":"2026-11-02T15:06:50.028669Z"}],"nvd":[{"id":"CVE-2001-1559","description":"The uipc system calls (uipc_syscalls.c) in OpenBSD 2.9 and 3.0 provide user mode return instead of versus rval kernel mode values to the fdrelease function, which allows local users to cause a denial of service and trigger a null dereference.","status":"published","published":"2001-12-31T05:00:00Z","modified":"2026-06-16T21:56:30.427Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary"},{"version":"2.0","score":2.1,"vector":"AV:L/AC:L/Au:N/C:N/I:N/A:P","level":"low","assessor":"primary"}],"cwes":["CWE-476"],"updated_at":"2026-11-02T14:00:41.313877Z"}]}}