CVE-2001-0402

Exp

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.

Published: 2001-06-18 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2001-0402 is rated High Exploit Risk (73.5/100): CVSS High severity, with medium exploitation likelihood (EPSS 2.44%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2001-0402

EDB-ID Source Kind Published Link
20730 exploit_db edb 2001-04-09 Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2001-0402

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 2.71% 2.44% -0.27%
2 2026-02-27 3.36% 2.71% -0.65%
3 2025-03-30 — 3.36% —

Full EPSS history (8 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2001-0402

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2001-0402

Affected software / configurations for CVE-2001-0402

Vendor Product Version Raw CPE
darren_reed ipfilter <= 3.4.16 cpe:2.3:a:darren_reed:ipfilter:*:*:*:*:*:*:*:*
freebsd freebsd <= 4.1 cpe:2.3:o:freebsd:freebsd:*:*:*:*:*:*:*:*
openbsd openbsd 2.8 cpe:2.3:o:openbsd:openbsd:2.8:*:*:*:*:*:*:*

References for CVE-2001-0402

cvelogic Threat Intelligence