CVE-2005-0127: Mail in Mac OS X 10.3.7, when generating a Message-ID header, generates a GUUID that includes information t...

Security readout for executives and security teams

Apple Mail on Mac OS X 10.3.7 could create email Message-ID values containing hardware-derived information. A recipient or intermediary could use that identifier to correlate separate messages to the same physical machine, creating a privacy and tracking risk rather than a system compromise risk. Exposure appears limited to legacy Mac OS X 10.3.7 systems using Apple Mail to send email. Current exposure depends on whether such systems still exist in archives, labs, kiosks, or unmanaged endpoints. Treat this as a legacy privacy exposure. It is not described as a breach-enabling vulnerability, but it may matter for organizations with old Apple Mail clients or sensitive sender anonymity requirements. Mitigation focus: Identify any remaining Mac OS X 10.3.7 Apple Mail clients.; Review Apple's advisory for the applicable security update or fixed version.; Upgrade or retire unsupported legacy Mac OS X systems where possible..

Prepared

Jun 30, 2026, 01:23 UTC (UTC+00:00)

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