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Vulnerability record · CVE-2003-1491 · published 31 December 2003

CVE-2003-1491: Kerio personal firewall code injection vulnerability

Kerio · Personal Firewall

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.

7.5 CVSS 2.0 High EPSS 2.4% · top 16.8% CWE-16 · CWE-16CWE-94 · Code injection
7.5CVSS 2.0 base score
2.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
16 Jun 2026Last modified by NVD

Description

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.

AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://archives.neohapsis.com/archives/fulldisclosure/2003-q2/0352.html
http://www.securiteam.com/securitynews/5FP0N1P9PI.html
http://www.securityfocus.com/bid/7436
https://exchange.xforce.ibmcloud.com/vulnerabilities/11880
http://archives.neohapsis.com/archives/fulldisclosure/2003-q2/0352.html
http://www.securiteam.com/securitynews/5FP0N1P9PI.html
http://www.securityfocus.com/bid/7436
https://exchange.xforce.ibmcloud.com/vulnerabilities/11880

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.5CVE-2005-1062Kerio mailserver vulnerabilityThe administration protocol for Kerio WinRoute Firewall 6.x up to 6.0.10, Personal Firewall 4.x up to 4.1.2, and MailServer up to 6.0.8 allows remote…EPSS 2.6%7.2CVE-2004-2329Kerio personal firewall vulnerabilityKerio Personal Firewall (KPF) 2.1.5 allows local users to execute arbitrary code with SYSTEM privileges via the Load button in the Firewall Configura…EPSS 0.56%5.0CVE-2006-5153Kerio personal firewall vulnerabilityThe (1) fwdrv.sys and (2) khips.sys drivers in Sunbelt Kerio Personal Firewall 4.3.268 and earlier do not validate arguments passed through to SSDT f…EPSS 1.6%5.0CVE-2005-1063Kerio mailserver vulnerabilityThe administration protocol for Kerio WinRoute Firewall 6.x up to 6.0.10, Personal Firewall 4.x up to 4.1.2, and MailServer up to 6.0.8 allows remote…EPSS 1.6%5.0CVE-2004-1109Kerio personal firewall vulnerabilityThe FWDRV.SYS driver in Kerio Personal Firewall 4.1.1 and earlier allows remote attackers to cause a denial of service (CPU consumption and system fr…EPSS 3.2%5.0CVE-2002-2161Kerio personal firewall vulnerabilityKerio Personal Firewall (KPF) 2.1.4 and earlier allows remote attackers to cause a denial of service (hang and CPU consumption) via a SYN packet floo…EPSS 1.6%4.6CVE-2005-0964Kerio personal firewall vulnerabilityUnknown vulnerability in Kerio Personal Firewall 4.1.2 and earlier allows local users to bypass firewall rules via a malicious process that impersona…EPSS 0.34%4.6CVE-2004-1658Kerio personal firewall vulnerabilityKerio Personal Firewall 4.0 (KPF4) allows local users with administrative privileges to bypass the Application Security feature and execute arbitrary…EPSS 0.92%

Source: NIST National Vulnerability Database (record CVE-2003-1491), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.