CVE-2000-0553

Exp

Race condition in IPFilter firewall 3.4.3 and earlier, when configured with overlapping "return-rst" and "keep state" rules, allows remote attackers to bypass access restrictions.

Published: 2000-05-26 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2000-0553 is rated Exploit Available (50.6/100): CVSS Low severity, with medium exploitation likelihood (EPSS 1.41%). 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-2000-0553

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2000-0553

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 0.44% 1.41% +0.97%
2 2025-03-30 0.49% 0.44% -0.05%
3 2025-03-29 — 0.49% —

Full EPSS history (6 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2000-0553

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
2.6 2.0 LOW
AV:N/AC:H/Au:N/C:N/I:P/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:H)
Exploitation requires uncommon or highly specific conditions.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 4.9 2.9 [email protected]

Weakness enumeration for CVE-2000-0553

Affected software / configurations for CVE-2000-0553

Vendor Product Version Raw CPE
darren_reed ipfilter 3.3.15 cpe:2.3:a:darren_reed:ipfilter:3.3.15:*:*:*:*:*:*:*
darren_reed ipfilter 3.4.3 cpe:2.3:a:darren_reed:ipfilter:3.4.3:*:*:*:*:*:*:*

References for CVE-2000-0553

cvelogic Threat Intelligence