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CVE-2001-0183

HighPublished

ipfw and ip6fw in FreeBSD 4.2 and earlier allows remote attackers to bypass access restrictions by setting the ECE flag in a TCP packet, which makes the...

Published: May 7, 2001
Updated: Aug 8, 2024
Assigning CNA: mitre
Evidence observed: Jan 23, 2001

Primary CVSS

7.5/ 10High

nvd · CVSS 2.0

AV:N/AC:L/Au:N/C:P/I:P/A:P

EPSS probability estimate

8.1%

Low · next 30 days

Percentile: 94.6%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

ipfw and ip6fw in FreeBSD 4.2 and earlier allows remote attackers to bypass access restrictions by setting the ECE flag in a TCP packet, which makes the packet appear to be part of an established connection.

Sources

FreeBSD 3.x/4.x - 'ipfw' Filtering EvasionExploit
Aragon Gouveia · freebsd · Jan 23, 2001

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