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OpenSSL 0.9.6 before 0.9.6d does not properly handle unknown message types, which allows remote attackers to cause a denial of service (infinite loop), as demonstrated using the Codenomicon TLS Test Tool.
Use Cisco vendor hub and Firewall Services Module product page to widen CVE-2004-0081 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2016-6367, CVE-2012-0356 and CVE-2011-0394 for nearby disclosures in the same product family. Additional editorial context is available in The Weekly Cybersecurity Brief: January 30th, 2026.