CVE-2001-0183
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.
Does this matter?
A public exploit is published in Exploit-DB (verified) and the impact is high, while EPSS rates exploitation at 8.1%. Anyone can run this; patch or mitigate before the next change window and check exposed instances for signs of use.
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.
- CVSS 2.0
- 7.5 HIGHAV:N/AC:L/Au:N/C:P/I:P/A:P
- EPSS
- 8.09% probability · 95th percentile
- Public exploits
- 1 in Exploit-DB · verified · first 23 January 2001
- CISA KEV
- Not listed
- Affected
- freebsd/freebsd
- Source
- cve@mitre.org
EPSS 8.1% since 26 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
Public exploits (1)
Entries in Exploit-DB that cite this CVE. Links go to the Exploit-DB page and to the file in the public repository; nothing is hosted here. A verified tick means the Exploit-DB team confirmed the exploit works against the stated version.
References
- ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-01:08.ipfw.ascPatch, Vendor 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/2293Exploit, Patch, Vendor Advisory
- https://exchange.xforce.ibmcloud.com/vulnerabilities/5998
- ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-01:08.ipfw.ascPatch, Vendor 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/2293Exploit, Patch, Vendor Advisory
- https://exchange.xforce.ibmcloud.com/vulnerabilities/5998
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.