CVE-2006-0121: Multiple memory leaks in IBM Lotus Notes and Domino Server before 6.5.5 allow attackers to cause a denial o...

Security readout for executives and security teams

This is an old IBM Lotus Notes and Domino issue where certain SSL handshake handling could leak memory until the application or server crashes. The main business risk is service interruption for organizations still running versions before 6.5.5. The public record does not confirm data theft, code execution, or active exploitation. Exposure is most likely in legacy environments still running IBM Lotus Notes or Domino Server before 6.5.5, especially where SSL-enabled components are reachable by users or networks. Modern environments are unlikely to be affected unless old Notes/Domino systems remain in production or internal infrastructure. Prioritize remediation if legacy Notes or Domino systems still support business workflows. The issue is availability-focused, not proven data compromise, but a crash of collaboration or messaging infrastructure can still disrupt operations. If no affected legacy systems remain, record the finding as not applicable. Mitigation focus: Upgrade affected IBM Lotus Notes or Domino Server deployments to 6.5.5 or later.; Review IBM advisory and Lotus SPR fix references for environment-specific guidance.; Restrict network access to legacy SSL-enabled Notes or Domino services where possible..

Prepared

Jun 29, 2026, 15:20 UTC (UTC+00:00)

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