Critical severity9.8NVD Advisory· Published Aug 23, 2001· Updated Jun 16, 2026

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.

Affected products

FreeBSD/FreeBSD
cpe:2.3:o:freebsd:freebsd:*:*:*:*:*:*:*:*
Range: >=4.1.1,<=4.3
FreeBSD/TCP Wrappersllm-create
Range: 4.1.1 to 4.3

Patches

Vulnerability mechanics

References

ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-01:56.tcp_wrappers.ascnvdBroken LinkPatchVendor Advisory
www.osvdb.org/5454nvdBroken Link

News mentions

No linked articles in our index yet.

cvss	0.637
epss	0.002
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000