CVE-2009-3699: Stack-based buffer overflow in libcsa.a (aka the calendar daemon library) in IBM AIX 5.x through 5.3.10 and...

Security readout for executives and security teams

This flaw affects older IBM AIX and VIOS systems running the rpc.cmsd calendar service. A remote attacker could trigger a stack buffer overflow and potentially run code on the server. The source bundle does not provide CVSS scoring, but remote code execution on infrastructure systems is business-significant. Exposure is likely limited to legacy IBM AIX or VIOS hosts where rpc.cmsd is present and reachable. Internet or broad internal network exposure would raise urgency. Modern systems outside the named AIX and VIOS ranges are not identified as affected in the provided sources. Treat this as high priority for legacy AIX or VIOS environments, especially where rpc.cmsd is reachable. The main business risk is remote code execution on infrastructure servers. If no affected systems remain, residual risk is low but should be documented. Mitigation focus: Identify AIX and VIOS hosts in the named affected version ranges.; Review IBM APARs and the cmsd advisory for applicable fixes or eFixes.; Limit network access to rpc.cmsd while remediation is assessed..

Prepared

Jun 28, 2026, 18:15 UTC (UTC+00:00)

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