CVE-2001-1155 — 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

Back Back to CVE browser

CRITICAL

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

Published Jun 25, 2002

9.8

CRITICAL

CVSS 3.1

EPSS 2.03%

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

Remediation

No remediation recorded yet.

Metrics

2.03% 0.02027

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.02027

Score over time

2022–2026

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Percentile over time

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Table of values (11 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	2.03% (0.02027)	80.30th	v5 (v2026.06.15)
Jun 15, 2026	2.03% (0.02027)	78.42th	v5 (v2026.06.15)
Mar 17, 2025	0.21% (0.00208)	41.16th	v4 (v2025.03.14)
Dec 12, 2024	0.44% (0.00436)	75.54th	v3 (v2023.03.01)
Feb 17, 2024	0.44% (0.00436)	74.02th	v3 (v2023.03.01)
Feb 8, 2024	0.31% (0.00306)	68.99th	v3 (v2023.03.01)
Mar 7, 2023	0.31% (0.00306)	65.04th	v3 (v2023.03.01)
Mar 6, 2023	1.05% (0.01055)	52.13th	v2 (v2022.01.01)
Sep 17, 2022	1.05% (0.01055)	50.47th	v2 (v2022.01.01)
Apr 1, 2022	1.05% (0.01055)	48.43th	v2 (v2022.01.01)
Feb 4, 2022	1.05% (0.01055)	27.52th	v2 (v2022.01.01)

Weaknesses (1)

CWE-863

Incorrect Authorization

References (2)

ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-01:56.tcp_wrappers.asc
vendor-advisoryx_refsource_FREEBSDBroken LinkPatchVendor Advisory
http://www.osvdb.org/5454
vdb-entryx_refsource_OSVDBBroken Link

Link	Providers	Tags
ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-01:56.tcp_wrappers.asc		vendor-advisoryx_refsource_FREEBSDBroken LinkPatchVendor Advisory
http://www.osvdb.org/5454		vdb-entryx_refsource_OSVDBBroken Link

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner mitre

Published Jun 25, 2002

Updated Aug 8, 2024

Reserved Mar 15, 2002

Link CVE-2001-1155

CISA Vulnrichment

Updated n/a

NVD

Status Modified

Modified Jun 16, 2026

Link CVE-2001-1155

Red Hat

Severity n/a

Public date n/a

Links CVE-2001-1155