CVE-2003-1527: IBM Internet Security Systems Blackice Defender

Medium severity, CVSS 4.3. EPSS: 1.4% chance of exploitation in the next 30 days.

BlackICE Defender 2.9.cap and Server Protection 3.5.cdf, when configured to automatically block attacks, allows remote attackers to block IP addresses and cause a denial of service via spoofed packets.

Affected products

• IBM Internet Security Systems Blackice Defender: version 2.9cap only
• Iss Blackice Server Protection: version 3.5.cdf only

Published 2003-12-31. Last modified 2026-06-16.