CVE-2001-1155

9.8 CRITICAL

Published: August 23, 2001 Modified: April 16, 2026

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.

AI Explanation

Get an AI-powered plain-language explanation of this vulnerability and remediation steps.

CVSS v3.x Details

0.0 Low Medium High Critical 10.0

Vector String

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory

ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-01:56.tcp_wrappers.asc

Source: cve@mitre.org

Broken Link Patch Vendor Advisory

http://www.osvdb.org/5454

Source: cve@mitre.org

Broken Link

ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-01:56.tcp_wrappers.asc

Source: af854a3a-2127-422b-91ae-364da2661108

Broken Link Patch Vendor Advisory

http://www.osvdb.org/5454

Source: af854a3a-2127-422b-91ae-364da2661108

Broken Link

4 reference(s) from NVD

Quick Stats

CVSS v3 Score

9.8 / 10.0

EPSS (Exploit Probability)

0.2%

42th percentile

Exploitation Status

Not in CISA KEV

Weaknesses (CWE)

CWE-863

Affected Vendors

freebsd

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