How severe is CVE-2000-0553?

CVE-2000-0553 has a CVSS 2.0 base score of 2.6, rated low severity.

Is CVE-2000-0553 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2000-0553?

CVE-2000-0553 primarily affects Darren Reed Ipfilter. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2000-0553?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2000-0553 published?

CVE-2000-0553 was published on 2000-05-26 and last updated on 2026-06-16.

CVE-2000-0553

CVE-2000-0553 is a low-severity vulnerability in Darren Reed Ipfilter with a CVSS 2.0 base score of 2.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Low (CVSS 2.0 base score 2.6)
EPSS exploit prediction: 1% (69th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Darren Reed Ipfilter
Published: 2000-05-26
Last modified: 2026-06-16

Description

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.

Frequently asked questions

What is CVE-2000-0553?: 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.
How severe is CVE-2000-0553?: CVE-2000-0553 has a CVSS 2.0 base score of 2.6, rated low severity.
Is CVE-2000-0553 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2000-0553?: CVE-2000-0553 primarily affects Darren Reed Ipfilter. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2000-0553?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2000-0553 published?: CVE-2000-0553 was published on 2000-05-26 and last updated on 2026-06-16.

References

Affected products (2)

cpe:2.3:a:darren_reed:ipfilter:3.3.15:*:*:*:*:*:*:*
cpe:2.3:a:darren_reed:ipfilter:3.4.3:*:*:*:*:*:*:*

More vulnerabilities in Darren Reed Ipfilter

CVE-2002-1978 — High (CVSS 7.5): IPFilter 3.1.1 through 3.4.28 allows remote attackers to bypass firewall rules by sending a PASV command string as the…
CVE-2001-0402 — High (CVSS 7.5): IPFilter 3.4.16 and earlier does not include sufficient session information in its cache, which allows remote attackers…
CVE-2009-1476 — High (CVSS 7.2): Buffer overflow in lib/load_http.c in ippool in Darren Reed IPFilter (aka IP Filter) 4.1.31 allows local users to gain…
CVE-1999-1244 — High (CVSS 7.2): IPFilter 3.2.3 through 3.2.10 allows local users to modify arbitrary files via a symlink attack on the saved output…

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