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Vulnerability record · CVE-2001-0183 · published 26 March 2001

CVE-2001-0183: Freebsd vulnerability

Freebsd · Freebsd

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.

7.5 CVSS 2.0 High EPSS 8.1% · top 5.4%
7.5CVSS 2.0 base score
8.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
12References, 2 tagged exploit
16 Jun 2026Last modified by NVD

Description

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-01:08.ipfw.asc PatchVendor Advisory
http://www.ciac.org/ciac/bulletins/l-029.shtml
http://www.osvdb.org/1743
http://www.security-express.com/archives/bugtraq/2001-01/0424.html
http://www.securityfocus.com/bid/2293 ExploitPatchVendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/5998
ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-01:08.ipfw.asc PatchVendor Advisory
http://www.ciac.org/ciac/bulletins/l-029.shtml
http://www.osvdb.org/1743
http://www.security-express.com/archives/bugtraq/2001-01/0424.html
http://www.securityfocus.com/bid/2293 ExploitPatchVendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/5998

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2001-0183), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.