Security readout for executives and security teams
A timing flaw in the IPFilter firewall (version 3.4.3 and earlier) can let outside attackers slip past network access rules when the firewall is set up with certain overlapping filter policies. In plain terms, the guard occasionally hesitates in a way that lets unwanted traffic through, weakening the protection the firewall was intended to provide. Exposure is limited to legacy environments still running IPFilter 3.4.3 or earlier with the specific overlapping "return-rst" and "keep state" rule configuration. This is a very old (2000-era) firewall build; modern deployments are unlikely to be affected, but long-lived UNIX appliances or embedded systems should be reviewed. Low-to-moderate priority for most organizations because the affected software predates 2001. It becomes a real priority only if legacy UNIX systems in the environment still rely on IPFilter as a perimeter or host firewall. Confirm inventory first, then schedule replacement or upgrade if any instances are found. Mitigation focus: Upgrade IPFilter to a version later than 3.4.3 per vendor guidance.; Audit ruleset for overlapping 'return-rst' and 'keep state' entries and remove the overlap.; Retire legacy IPFilter appliances that can no longer receive vendor updates..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
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CVE-2000-0553 mapping review
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Open ATT&CK lookup- Severity
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- Known Exploited
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CNA and ADP enrichment extracted from CVE v5
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CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- ipfilter-firewall-race-condition(4994)CVE reference · vdb-entry, x_refsource_XF
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CWE details
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