{"cve":"CVE-2001-1559","nvd":{"published":"2001-12-31T05:00:00.000","modified":"2026-06-16T21:56:30.427","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-476"],"references":["http://archives.neohapsis.com/archives/bugtraq/2001-12/0014.html","http://monkey.org/openbsd/archive/tech/0112/msg00015.html","http://www.iss.net/security_center/static/7690.php","http://archives.neohapsis.com/archives/bugtraq/2001-12/0014.html","http://monkey.org/openbsd/archive/tech/0112/msg00015.html"],"products":["openbsd:openbsd"],"source":"nvd","synced_at":"2026-10-19T19:34:38.930894741+00:00"},"epss":{"cve":"CVE-2001-1559","score":0.01482,"percentile":0.73962,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}