CVE-2001-0402

Severity: high (CVSS 7.5 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.4% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2001-06-18 · updated 2026-06-16

Description

IPFilter 3.4.16 and earlier does not include sufficient session information in its cache, which allows remote attackers to bypass access restrictions by sending fragmented packets to a restricted port after sending unfragmented packets to an unrestricted port.

Affected products

Darren Reed Ipfilter: through 3.4.16
FreeBSD: through 4.1
OpenBSD: 2.8

References

http://archives.neohapsis.com/archives/freebsd/2001-04/0338.html
http://marc.info/?l=bugtraq&m=98679734015538&w=2
https://exchange.xforce.ibmcloud.com/vulnerabilities/6331
http://archives.neohapsis.com/archives/freebsd/2001-04/0338.html
http://marc.info/?l=bugtraq&m=98679734015538&w=2
https://exchange.xforce.ibmcloud.com/vulnerabilities/6331

Get alerted when CVE-2001-0402 or the next vulnerability affects your stack