CVE-2003-1491: n/a vulnerability

CVE-2003-1491: Kerio Personal Firewall (KPF) 2.1.4 has a default rule to accept incoming packets from DNS (UDP port 53), w...

Kerio Personal Firewall (KPF) 2.1.4 has a default rule to accept incoming packets from DNS (UDP port 53), which allows remote attackers to bypass the firewall filters via packets with a source port of 53.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 8, 2024, 02:28 UTC (UTC+00:00)

Security readout for executives and security teams

Kerio Personal Firewall 2.1.4 reportedly allowed inbound traffic that appeared to come from DNS over UDP. An attacker could abuse that default trust decision to bypass firewall filtering. The issue matters mainly for legacy systems still running this old firewall configuration. Exposure is likely limited to legacy hosts running Kerio Personal Firewall 2.1.4 with the vulnerable default DNS-related inbound rule still enabled. The bundle does not identify broader affected versions, platforms, or modern product names. Prioritize this if legacy Kerio Personal Firewall deployments still protect business systems. The business risk is misplaced trust in an old host firewall rule, not a confirmed current mass-exploitation campaign. Unsupported systems should be retired or isolated. Mitigation focus: Identify any Kerio Personal Firewall 2.1.4 deployments or retained legacy images.; Review firewall rules that trust inbound UDP traffic based on source port 53.; Restrict inbound DNS-related traffic to legitimate resolver relationships only..

Prepared: Jun 29, 2026, 02:08 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Oct 24, 2007, 23:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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0CVSS vectors

0Timeline events

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2Source links

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
kerio-pf-firewall-bypass(11880)CVE reference · vdb-entry, x_refsource_XF

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

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