{"id":"CVE-2001-1155","aliases":["EUVD-2001-1136","GHSA-g76r-67w3-6583"],"status":"published","title":"TCP Wrappers (tcp_wrappers) in FreeBSD 4.1.1 through 4.3 with the PARANOID ACL option enabled...","description":"TCP Wrappers (tcp_wrappers) in FreeBSD 4.1.1 through 4.3 with the PARANOID ACL option enabled does not properly check the result of a reverse DNS lookup, which could allow remote attackers to bypass intended access restrictions via DNS spoofing.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.02027,"percentile":0.81151,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-863"],"published":"2001-08-23T04:00:00Z","modified":"2026-06-16T21:55:41Z","products":[{"vendor":"freebsd","product":"freebsd"}],"references":[{"url":"http://www.osvdb.org/5454","tags":["vdb-entry","x_refsource_OSVDB","x_transferred","Broken Link"]},{"url":"ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-01:56.tcp_wrappers.asc","tags":["vendor-advisory","x_refsource_FREEBSD","x_transferred","Broken Link","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2001-1155"},{"url":"https://github.com/advisories/GHSA-g76r-67w3-6583"}],"sources":{"cve":[{"id":"CVE-2001-1155","description":"TCP Wrappers (tcp_wrappers) in FreeBSD 4.1.1 through 4.3 with the PARANOID ACL option enabled does not properly check the result of a reverse DNS lookup, which could allow remote attackers to bypass intended access restrictions via DNS spoofing.","status":"published","published":"2002-06-25T04:00:00Z","modified":"2024-08-08T04:44:07.95Z","updated_at":"2026-11-02T14:34:42.680977Z"}],"euvd":[{"id":"EUVD-2001-1136","description":"TCP Wrappers (tcp_wrappers) in FreeBSD 4.1.1 through 4.3 with the PARANOID ACL option enabled does not properly check the result of a reverse DNS lookup, which could allow remote attackers to bypass intended access restrictions via DNS spoofing.","status":"published","published":"2002-06-25T04:00:00Z","modified":"2024-08-08T04:44:07Z","updated_at":"2026-11-03T01:14:48.585514Z"}],"ghsa":[{"id":"GHSA-g76r-67w3-6583","title":"TCP Wrappers (tcp_wrappers) in FreeBSD 4.1.1 through 4.3 with the PARANOID ACL option enabled...","description":"TCP Wrappers (tcp_wrappers) in FreeBSD 4.1.1 through 4.3 with the PARANOID ACL option enabled does not properly check the result of a reverse DNS lookup, which could allow remote attackers to bypass intended access restrictions via DNS spoofing.","status":"published","published":"2022-05-03T03:07:14Z","modified":"2023-02-01T05:01:01Z","updated_at":"2026-11-02T14:49:39.185404Z"}],"nvd":[{"id":"CVE-2001-1155","description":"TCP Wrappers (tcp_wrappers) in FreeBSD 4.1.1 through 4.3 with the PARANOID ACL option enabled does not properly check the result of a reverse DNS lookup, which could allow remote attackers to bypass intended access restrictions via DNS spoofing.","status":"published","published":"2001-08-23T04:00:00Z","modified":"2026-06-16T21:55:41.56Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"cwes":["CWE-863"],"updated_at":"2026-11-02T14:00:40.572315Z"}]}}