What’s Vulnerable › Vulnerabilities

CVE-2003-1491

• Severity: high (CVSS 7.5 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2003-12-31 · updated 2026-06-16
• Weakness: CWE-16

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.

Affected products

• Kerio Personal Firewall: 2.1.4

References

• 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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